159 files changed, 243 insertions, 800 deletions
diff --git a/keyboards/afternoonlabs/breeze/rev0/config.h b/keyboards/afternoonlabs/breeze/rev0/config.h
deleted file mode 100644
index 3500564544..0000000000
--- a/keyboards/afternoonlabs/breeze/rev0/config.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright 2021 eithanshavit
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN B3
diff --git a/keyboards/afternoonlabs/breeze/rev0/keyboard.json b/keyboards/afternoonlabs/breeze/rev0/keyboard.json
index f20f082ec9..e4288d3eda 100644
--- a/keyboards/afternoonlabs/breeze/rev0/keyboard.json
+++ b/keyboards/afternoonlabs/breeze/rev0/keyboard.json
@@ -21,6 +21,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B3"
+        },
        "soft_serial_pin": "D2"
    },
    "bootmagic": {
diff --git a/keyboards/afternoonlabs/breeze/rev1/config.h b/keyboards/afternoonlabs/breeze/rev1/config.h
deleted file mode 100644
index d6bb6df14c..0000000000
--- a/keyboards/afternoonlabs/breeze/rev1/config.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright 2021 Afternoon Labs
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN B3
diff --git a/keyboards/afternoonlabs/breeze/rev1/keyboard.json b/keyboards/afternoonlabs/breeze/rev1/keyboard.json
index ccb13551c1..22a7edb6c0 100644
--- a/keyboards/afternoonlabs/breeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/breeze/rev1/keyboard.json
@@ -21,6 +21,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B3"
+        },
        "soft_serial_pin": "D2"
    },
    "bootmagic": {
diff --git a/keyboards/afternoonlabs/oceanbreeze/rev1/config.h b/keyboards/afternoonlabs/oceanbreeze/rev1/config.h
deleted file mode 100644
index d6bb6df14c..0000000000
--- a/keyboards/afternoonlabs/oceanbreeze/rev1/config.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright 2021 Afternoon Labs
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN B3
diff --git a/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json b/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json
index 2a80a0bc2b..f614b93ca1 100644
--- a/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json
@@ -21,6 +21,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B3"
+        },
        "soft_serial_pin": "D2"
    },
    "bootmagic": {
diff --git a/keyboards/afternoonlabs/southern_breeze/rev1/config.h b/keyboards/afternoonlabs/southern_breeze/rev1/config.h
deleted file mode 100644
index d6bb6df14c..0000000000
--- a/keyboards/afternoonlabs/southern_breeze/rev1/config.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright 2021 Afternoon Labs
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN B3
diff --git a/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json b/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json
index c4d38a7a69..2ec7b411e1 100644
--- a/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json
@@ -21,6 +21,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B3"
+        },
        "soft_serial_pin": "D2"
    },
    "bootmagic": {
diff --git a/keyboards/afternoonlabs/summer_breeze/rev1/config.h b/keyboards/afternoonlabs/summer_breeze/rev1/config.h
deleted file mode 100644
index d6bb6df14c..0000000000
--- a/keyboards/afternoonlabs/summer_breeze/rev1/config.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright 2021 Afternoon Labs
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN B3
diff --git a/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json b/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json
index 702a942a3c..9377f10732 100644
--- a/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json
@@ -21,6 +21,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B3"
+        },
        "soft_serial_pin": "D2"
    },
    "bootmagic": {
diff --git a/keyboards/ai03/orbit/config.h b/keyboards/ai03/orbit/config.h
deleted file mode 100644
index f3a4ae2db3..0000000000
--- a/keyboards/ai03/orbit/config.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-Copyright 2018 Ryota Goto
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SELECT_SOFT_SERIAL_SPEED 1
-#define SPLIT_HAND_PIN D5
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-//#define NO_DEBUG
-/* disable print */
-//#define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/ai03/orbit/keyboard.json b/keyboards/ai03/orbit/keyboard.json
index ec30802812..a5a60c12b6 100644
--- a/keyboards/ai03/orbit/keyboard.json
+++ b/keyboards/ai03/orbit/keyboard.json
@@ -31,6 +31,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D5"
+        },
        "soft_serial_pin": "D0",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/ai03/orbit_x/config.h b/keyboards/ai03/orbit_x/config.h
index 2c63852cbe..8de0482312 100644
--- a/keyboards/ai03/orbit_x/config.h
+++ b/keyboards/ai03/orbit_x/config.h
@@ -17,7 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN D5
 #define SPLIT_USB_DETECT
 #define SPLIT_USB_TIMEOUT 2500
diff --git a/keyboards/ai03/orbit_x/keyboard.json b/keyboards/ai03/orbit_x/keyboard.json
index edfbbb2796..7323841219 100644
--- a/keyboards/ai03/orbit_x/keyboard.json
+++ b/keyboards/ai03/orbit_x/keyboard.json
@@ -28,6 +28,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D5"
+        },
        "soft_serial_pin": "D0",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/aya/config.h b/keyboards/aya/config.h
index 14fc201d49..1ab53d70ae 100644
--- a/keyboards/aya/config.h
+++ b/keyboards/aya/config.h
@@ -16,5 +16,4 @@
 #pragma once
-#define SPLIT_HAND_PIN B5
 #define USE_I2C
diff --git a/keyboards/aya/keyboard.json b/keyboards/aya/keyboard.json
index 547f495ddd..6f9ad387bc 100644
--- a/keyboards/aya/keyboard.json
+++ b/keyboards/aya/keyboard.json
@@ -15,7 +15,10 @@
        "command": true
    },
    "split": {
-        "enabled": true
+        "enabled": true,
+        "handedness": {
+            "pin": "B5"
+        }
    },
    "matrix_pins": {
        "cols": ["F4", "F5", "F6", "F7", "B1", "B3", "B2"],
diff --git a/keyboards/doppelganger/config.h b/keyboards/doppelganger/config.h
deleted file mode 100644
index 20a23ab6da..0000000000
--- a/keyboards/doppelganger/config.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-Copyright 2019 Yiancar-Designs
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D4
-// #define USE_I2C
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-//#define NO_DEBUG
-/* disable print */
-//#define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/doppelganger/keyboard.json b/keyboards/doppelganger/keyboard.json
index ccba77fdfa..f77597c990 100644
--- a/keyboards/doppelganger/keyboard.json
+++ b/keyboards/doppelganger/keyboard.json
@@ -19,6 +19,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D4"
+        },
        "soft_serial_pin": "D1",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/era/sirind/tomak/config.h b/keyboards/era/sirind/tomak/config.h
index 7bb5610705..0f34f674df 100644
--- a/keyboards/era/sirind/tomak/config.h
+++ b/keyboards/era/sirind/tomak/config.h
@@ -4,7 +4,6 @@
 #pragma once
 /* Split configuration */
-#define SPLIT_HAND_PIN GP21
 #define USB_VBUS_PIN GP29
 #define SERIAL_USART_FULL_DUPLEX
 #define SERIAL_USART_TX_PIN GP0
diff --git a/keyboards/era/sirind/tomak/keyboard.json b/keyboards/era/sirind/tomak/keyboard.json
index a2f545cf5e..cfd933bfe6 100644
--- a/keyboards/era/sirind/tomak/keyboard.json
+++ b/keyboards/era/sirind/tomak/keyboard.json
@@ -175,6 +175,9 @@
        "bootmagic": {
            "matrix": [6, 0]
        },
+        "handedness": {
+            "pin": "GP21"
+        },
        "enabled": true,
        "matrix_pins": {
            "right": {
diff --git a/keyboards/handwired/chiron/config.h b/keyboards/handwired/chiron/config.h
deleted file mode 100644
index 254bed5c74..0000000000
--- a/keyboards/handwired/chiron/config.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
-Copyright 2019 Mike Hix
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-// Pro Micro Pins      RX1
-#define SPLIT_HAND_PIN D2
diff --git a/keyboards/handwired/chiron/keyboard.json b/keyboards/handwired/chiron/keyboard.json
index f02c8cea28..efbf66335b 100644
--- a/keyboards/handwired/chiron/keyboard.json
+++ b/keyboards/handwired/chiron/keyboard.json
@@ -41,6 +41,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D2"
+        },
        "soft_serial_pin": "D0"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/config.h b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/config.h
index 9639d4ba1d..2258a17c2e 100644
--- a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/config.h
+++ b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/config.h
@@ -19,7 +19,6 @@
 // in col2row col is input, and row is output
 // #define SPLIT_HAND_MATRIX_GRID A10, A4
 // 68kohm
-#define SPLIT_HAND_PIN              B10
 /* connection */
 #define SERIAL_USART_FULL_DUPLEX   // Enable full duplex operation mode.
diff --git a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json
index 517620097b..efefb5e550 100644
--- a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json
+++ b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json
@@ -11,6 +11,9 @@
        },
        "serial": {
            "driver": "usart"
+        },
+        "handedness": {
+            "pin": "B10"
        }
    },
    "development_board": "blackpill_f411",
diff --git a/keyboards/handwired/jtallbean/split_65/config.h b/keyboards/handwired/jtallbean/split_65/config.h
deleted file mode 100644
index 2ae835db9d..0000000000
--- a/keyboards/handwired/jtallbean/split_65/config.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
-Copyright 2020 jtallbean
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D5
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-//#define NO_DEBUG
-/* disable print */
-//#define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/handwired/jtallbean/split_65/keyboard.json b/keyboards/handwired/jtallbean/split_65/keyboard.json
index b6560fb03a..7ce6d9f095 100644
--- a/keyboards/handwired/jtallbean/split_65/keyboard.json
+++ b/keyboards/handwired/jtallbean/split_65/keyboard.json
@@ -32,6 +32,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D5"
+        },
        "soft_serial_pin": "D0",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/handwired/riblee_split/config.h b/keyboards/handwired/riblee_split/config.h
index c3b0720ba5..f0fa2b1f2f 100644
--- a/keyboards/handwired/riblee_split/config.h
+++ b/keyboards/handwired/riblee_split/config.h
@@ -3,9 +3,6 @@
 #pragma once
-// If the pin is high, then the controller assumes it is the left hand, and if it’s low, it’s assumed to be the right side.
-#define SPLIT_HAND_PIN C15
 #define SERIAL_USART_FULL_DUPLEX
 #define SERIAL_USART_TX_PIN B6
 #define SERIAL_USART_RX_PIN B7
diff --git a/keyboards/handwired/riblee_split/keyboard.json b/keyboards/handwired/riblee_split/keyboard.json
index 0a607036f9..f24dbe2ce6 100644
--- a/keyboards/handwired/riblee_split/keyboard.json
+++ b/keyboards/handwired/riblee_split/keyboard.json
@@ -25,6 +25,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "C15"
+        },
        "serial": {
            "driver": "usart"
        },
diff --git a/keyboards/handwired/split89/config.h b/keyboards/handwired/split89/config.h
deleted file mode 100644
index e12db37b97..0000000000
--- a/keyboards/handwired/split89/config.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/* Copyright 2021 jurassic73
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-/* this will be tied to high (VCC with a 2k to 10k resistor) on the left keyboard half and tied to low (GND using a wire jumper only) on the right keyboard half.  This allows a user to plug in a USB cable to either side and function correctly with or without a TRS/TRRS cable with a single hex file. */
-#define SPLIT_HAND_PIN D1
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-//#define NO_DEBUG
-/* disable print */
-//#define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/handwired/split89/keyboard.json b/keyboards/handwired/split89/keyboard.json
index d28953ab5f..029988b0ba 100644
--- a/keyboards/handwired/split89/keyboard.json
+++ b/keyboards/handwired/split89/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D1"
+        },
        "soft_serial_pin": "D0",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/handwired/splittest/bluepill/config.h b/keyboards/handwired/splittest/bluepill/config.h
index d19bb3dee8..af29e34088 100644
--- a/keyboards/handwired/splittest/bluepill/config.h
+++ b/keyboards/handwired/splittest/bluepill/config.h
@@ -3,8 +3,6 @@
 #pragma once
-#define SPLIT_HAND_PIN A7
 #if !(defined(USE_SDI1_ON_STANDARD_ROLE_PINS) || defined(USE_SDI1_ON_ALTERNATE_ROLE_PINS) || defined(USE_SDI2))
    #define USE_SDI1_ON_STANDARD_ROLE_PINS
 #endif
diff --git a/keyboards/handwired/splittest/bluepill/keyboard.json b/keyboards/handwired/splittest/bluepill/keyboard.json
index 5c061a7119..42859f5ee8 100644
--- a/keyboards/handwired/splittest/bluepill/keyboard.json
+++ b/keyboards/handwired/splittest/bluepill/keyboard.json
@@ -3,6 +3,11 @@
        "cols": ["B1"],
        "rows": ["B10"]
    },
+    "split": {
+        "handedness": {
+            "pin": "A7"
+        }
+    },
    "diode_direction": "COL2ROW",
    "development_board": "bluepill",
    "features": {
diff --git a/keyboards/handwired/splittest/promicro/config.h b/keyboards/handwired/splittest/promicro/config.h
index 4458ddaffe..2c39af2df7 100644
--- a/keyboards/handwired/splittest/promicro/config.h
+++ b/keyboards/handwired/splittest/promicro/config.h
@@ -16,8 +16,5 @@
 #pragma once
 // use I2C on AVR
 #define USE_I2C
-#define SPLIT_HAND_PIN F6
diff --git a/keyboards/handwired/splittest/promicro/keyboard.json b/keyboards/handwired/splittest/promicro/keyboard.json
index 2f5929cc00..8aca1c3de7 100644
--- a/keyboards/handwired/splittest/promicro/keyboard.json
+++ b/keyboards/handwired/splittest/promicro/keyboard.json
@@ -5,6 +5,9 @@
    },
    "diode_direction": "COL2ROW",
    "split": {
+        "handedness": {
+            "pin": "F6"
+        },
        "soft_serial_pin": "D1"
    },
    "ws2812": {
diff --git a/keyboards/handwired/splittest/teensy_2/config.h b/keyboards/handwired/splittest/teensy_2/config.h
index 20672a381f..f7033863e0 100644
--- a/keyboards/handwired/splittest/teensy_2/config.h
+++ b/keyboards/handwired/splittest/teensy_2/config.h
@@ -16,11 +16,8 @@
 #pragma once
 // use I2C on AVR
 #define USE_I2C
-#define SPLIT_HAND_PIN F0
 // teensy has vbus detection issues - use usb detection instead
 #define SPLIT_USB_DETECT
diff --git a/keyboards/handwired/splittest/teensy_2/keyboard.json b/keyboards/handwired/splittest/teensy_2/keyboard.json
index 68ab3f92c4..c10b20a173 100644
--- a/keyboards/handwired/splittest/teensy_2/keyboard.json
+++ b/keyboards/handwired/splittest/teensy_2/keyboard.json
@@ -5,6 +5,9 @@
    },
    "diode_direction": "COL2ROW",
    "split": {
+        "handedness": {
+            "pin": "F0"
+        },
        "soft_serial_pin": "D1"
    },
    "ws2812": {
diff --git a/keyboards/handwired/tractyl_manuform/4x6_right/config.h b/keyboards/handwired/tractyl_manuform/4x6_right/config.h
index 9d283866b4..ba187a8376 100644
--- a/keyboards/handwired/tractyl_manuform/4x6_right/config.h
+++ b/keyboards/handwired/tractyl_manuform/4x6_right/config.h
@@ -19,7 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 #define SPLIT_TRANSPORT_MIRROR
-#define SPLIT_HAND_PIN A6
 // #define DEBUG_LED_PIN                  D6
diff --git a/keyboards/handwired/tractyl_manuform/4x6_right/keyboard.json b/keyboards/handwired/tractyl_manuform/4x6_right/keyboard.json
index 825c59ac72..e5730a4586 100644
--- a/keyboards/handwired/tractyl_manuform/4x6_right/keyboard.json
+++ b/keyboards/handwired/tractyl_manuform/4x6_right/keyboard.json
@@ -19,6 +19,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "A6"
+        },
        "soft_serial_pin": "D3",
        "bootmagic": {
            "matrix": [4, 5]
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f303/config.h b/keyboards/handwired/tractyl_manuform/5x6_right/f303/config.h
index a2818e7176..b10fe7de74 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f303/config.h
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f303/config.h
@@ -19,7 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 // #define USB_VBUS_PIN        B10
-#define SPLIT_HAND_PIN      C14  // high = left, low = right
 // WS2812 RGB LED strip input and number of LEDs
 #define WS2812_PWM_DRIVER   PWMD3  // default: PWMD2
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json b/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json
index a9bfd7ee55..a9070f2cc7 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json
@@ -16,6 +16,9 @@
        "driver": "dac_additive"
    },
    "split": {
+        "handedness": {
+            "pin": "C14"
+        },
        "serial": {
            "driver": "usart"
        }
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f411/config.h b/keyboards/handwired/tractyl_manuform/5x6_right/f411/config.h
index 87f830e175..64169da7e5 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f411/config.h
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f411/config.h
@@ -19,7 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 // #define USB_VBUS_PIN        B10 // doesn't seem to work for me on one of my controllers... */
-#define SPLIT_HAND_PIN      C14  // high = left, low = right
 // WS2812 RGB LED strip input and number of LEDs
 #define WS2812_PWM_DRIVER   PWMD2  // default: PWMD2
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json b/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json
index 65124f3a3d..c7d38c0daf 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json
@@ -19,9 +19,12 @@
        "driver": "pwm_hardware"
    },
    "split": {
+        "handedness": {
+            "pin": "C14"
+        },
        "serial": {
            "driver": "usart"
-        }
+        },
    },
    "ws2812": {
        "pin": "A1",
diff --git a/keyboards/jian/rev2/config.h b/keyboards/jian/rev2/config.h
index 33ba0ecbc5..b236a8cbe1 100644
--- a/keyboards/jian/rev2/config.h
+++ b/keyboards/jian/rev2/config.h
@@ -18,7 +18,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 //#define EE_HANDS
-#define SPLIT_HAND_PIN E6
 #define PHYSICAL_LEDS_ENABLE
 #define IOS_DEVICE_ENABLE
diff --git a/keyboards/jian/rev2/keyboard.json b/keyboards/jian/rev2/keyboard.json
index e64df224a5..757fee166d 100644
--- a/keyboards/jian/rev2/keyboard.json
+++ b/keyboards/jian/rev2/keyboard.json
@@ -39,6 +39,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "E6"
+        },
        "soft_serial_pin": "D1"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/kakunpc/suihankey/split/alpha/config.h b/keyboards/kakunpc/suihankey/split/alpha/config.h
index ebccdcca30..23900d8ab2 100644
--- a/keyboards/kakunpc/suihankey/split/alpha/config.h
+++ b/keyboards/kakunpc/suihankey/split/alpha/config.h
@@ -19,8 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define USE_I2C
-#define SPLIT_HAND_PIN D2
 /*
 * Feature disable options
 *  These options are also useful to firmware size reduction.
diff --git a/keyboards/kakunpc/suihankey/split/info.json b/keyboards/kakunpc/suihankey/split/info.json
index c186263123..2e5bf1ce97 100644
--- a/keyboards/kakunpc/suihankey/split/info.json
+++ b/keyboards/kakunpc/suihankey/split/info.json
@@ -10,6 +10,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D2"
+        },
        "soft_serial_pin": "D0"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/kakunpc/suihankey/split/rev1/config.h b/keyboards/kakunpc/suihankey/split/rev1/config.h
index ebccdcca30..23900d8ab2 100644
--- a/keyboards/kakunpc/suihankey/split/rev1/config.h
+++ b/keyboards/kakunpc/suihankey/split/rev1/config.h
@@ -19,8 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define USE_I2C
-#define SPLIT_HAND_PIN D2
 /*
 * Feature disable options
 *  These options are also useful to firmware size reduction.
diff --git a/keyboards/keebio/cepstrum/rev1/config.h b/keyboards/keebio/cepstrum/rev1/config.h
index 7c3bb16bad..5ece396104 100644
--- a/keyboards/keebio/cepstrum/rev1/config.h
+++ b/keyboards/keebio/cepstrum/rev1/config.h
@@ -3,8 +3,6 @@
 #pragma once
-#define SPLIT_HAND_PIN GP4
 #define USB_VBUS_PIN GP12
 #define SERIAL_USART_FULL_DUPLEX
diff --git a/keyboards/keebio/cepstrum/rev1/keyboard.json b/keyboards/keebio/cepstrum/rev1/keyboard.json
index 27756784bc..26289f6236 100644
--- a/keyboards/keebio/cepstrum/rev1/keyboard.json
+++ b/keyboards/keebio/cepstrum/rev1/keyboard.json
@@ -9,6 +9,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "GP4"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["GP29", "GP28", "GP27", "GP26", "GP25", "GP21", "GP15", "GP9", "GP10"],
diff --git a/keyboards/keebio/foldkb/rev1/config.h b/keyboards/keebio/foldkb/rev1/config.h
index 0435a34e7f..572ff9a83a 100644
--- a/keyboards/keebio/foldkb/rev1/config.h
+++ b/keyboards/keebio/foldkb/rev1/config.h
@@ -16,6 +16,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN F7
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/foldkb/rev1/keyboard.json b/keyboards/keebio/foldkb/rev1/keyboard.json
index c7055400a5..447f2ed0fd 100644
--- a/keyboards/keebio/foldkb/rev1/keyboard.json
+++ b/keyboards/keebio/foldkb/rev1/keyboard.json
@@ -23,6 +23,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "F7"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/keebio/fourier/config.h b/keyboards/keebio/fourier/config.h
deleted file mode 100644
index 49d868c968..0000000000
--- a/keyboards/keebio/fourier/config.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-Copyright 2015 Jack Humbert
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-/* Split Defines */
-#define SPLIT_HAND_PIN D2
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-// #define NO_DEBUG
-/* disable print */
-// #define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/keebio/fourier/keyboard.json b/keyboards/keebio/fourier/keyboard.json
index 189276b877..6f83ae6f53 100644
--- a/keyboards/keebio/fourier/keyboard.json
+++ b/keyboards/keebio/fourier/keyboard.json
@@ -36,6 +36,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D2"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/keebio/iris/rev3/config.h b/keyboards/keebio/iris/rev3/config.h
deleted file mode 100644
index ff730d345c..0000000000
--- a/keyboards/keebio/iris/rev3/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2017 Danny Nguyen <danny@keeb.io>
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN F0
diff --git a/keyboards/keebio/iris/rev3/keyboard.json b/keyboards/keebio/iris/rev3/keyboard.json
index e2353d751f..9ffafa3f89 100644
--- a/keyboards/keebio/iris/rev3/keyboard.json
+++ b/keyboards/keebio/iris/rev3/keyboard.json
@@ -45,6 +45,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "F0"
+        },
        "soft_serial_pin": "D0"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/keebio/iris/rev4/config.h b/keyboards/keebio/iris/rev4/config.h
deleted file mode 100644
index 246049a730..0000000000
--- a/keyboards/keebio/iris/rev4/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2019 Danny Nguyen <danny@keeb.io>
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D5
diff --git a/keyboards/keebio/iris/rev4/keyboard.json b/keyboards/keebio/iris/rev4/keyboard.json
index ee06554d08..a43e7b88d2 100644
--- a/keyboards/keebio/iris/rev4/keyboard.json
+++ b/keyboards/keebio/iris/rev4/keyboard.json
@@ -53,6 +53,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "D5"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["D4", "D7", "D3", "B7", "F0", "B3"],
diff --git a/keyboards/keebio/iris/rev5/config.h b/keyboards/keebio/iris/rev5/config.h
index 4b67b6632f..71d2044aa6 100644
--- a/keyboards/keebio/iris/rev5/config.h
+++ b/keyboards/keebio/iris/rev5/config.h
@@ -17,6 +17,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN D5
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/iris/rev5/keyboard.json b/keyboards/keebio/iris/rev5/keyboard.json
index a1f97a7831..799e510cc2 100644
--- a/keyboards/keebio/iris/rev5/keyboard.json
+++ b/keyboards/keebio/iris/rev5/keyboard.json
@@ -70,6 +70,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "D5"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["D4", "D7", "D3", "B7", "F0", "B3"],
diff --git a/keyboards/keebio/iris/rev6/config.h b/keyboards/keebio/iris/rev6/config.h
index f52c020dee..867a96ad95 100644
--- a/keyboards/keebio/iris/rev6/config.h
+++ b/keyboards/keebio/iris/rev6/config.h
@@ -17,6 +17,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN D5
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/iris/rev6/keyboard.json b/keyboards/keebio/iris/rev6/keyboard.json
index 7bbaabe277..bcbacb5b22 100644
--- a/keyboards/keebio/iris/rev6/keyboard.json
+++ b/keyboards/keebio/iris/rev6/keyboard.json
@@ -86,6 +86,9 @@
    "split": {
        "enabled": true,
        "soft_serial_pin": "D0",
+        "handedness": {
+            "pin": "D5"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["D4", "D6", "D7", "C7", "F1", "F4"],
diff --git a/keyboards/keebio/iris/rev7/config.h b/keyboards/keebio/iris/rev7/config.h
index eec56a2620..b5f24925c0 100644
--- a/keyboards/keebio/iris/rev7/config.h
+++ b/keyboards/keebio/iris/rev7/config.h
@@ -17,6 +17,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN D5
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/iris/rev7/keyboard.json b/keyboards/keebio/iris/rev7/keyboard.json
index decb81a18e..1f7677ef4d 100644
--- a/keyboards/keebio/iris/rev7/keyboard.json
+++ b/keyboards/keebio/iris/rev7/keyboard.json
@@ -85,6 +85,9 @@
    "split": {
        "enabled": true,
        "soft_serial_pin": "D0",
+        "handedness": {
+            "pin": "D5"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["D4", "D6", "D7", "C7", "F1", "F4"],
diff --git a/keyboards/keebio/iris/rev8/config.h b/keyboards/keebio/iris/rev8/config.h
index 3ea59ffcf6..e9eb512981 100644
--- a/keyboards/keebio/iris/rev8/config.h
+++ b/keyboards/keebio/iris/rev8/config.h
@@ -3,8 +3,6 @@
 #pragma once
-#define SPLIT_HAND_PIN GP4
 #define USB_VBUS_PIN GP8
 #define SERIAL_USART_FULL_DUPLEX
diff --git a/keyboards/keebio/iris/rev8/keyboard.json b/keyboards/keebio/iris/rev8/keyboard.json
index 07f9df260a..7ff198afa7 100644
--- a/keyboards/keebio/iris/rev8/keyboard.json
+++ b/keyboards/keebio/iris/rev8/keyboard.json
@@ -24,6 +24,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "GP4"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["GP27", "GP28", "GP3", "GP6", "GP29", "GP16"],
diff --git a/keyboards/keebio/iris_ce/rev1/config.h b/keyboards/keebio/iris_ce/rev1/config.h
index e5f43f001e..2a9d57b061 100644
--- a/keyboards/keebio/iris_ce/rev1/config.h
+++ b/keyboards/keebio/iris_ce/rev1/config.h
@@ -3,7 +3,6 @@
 #pragma once
-#define SPLIT_HAND_PIN GP4
 #define USB_VBUS_PIN GP0
 #define SERIAL_USART_FULL_DUPLEX
 #define SERIAL_USART_TX_PIN GP12
diff --git a/keyboards/keebio/iris_ce/rev1/keyboard.json b/keyboards/keebio/iris_ce/rev1/keyboard.json
index 1f131e51bd..c5cab98778 100644
--- a/keyboards/keebio/iris_ce/rev1/keyboard.json
+++ b/keyboards/keebio/iris_ce/rev1/keyboard.json
@@ -135,6 +135,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "GP4"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["GP29", "GP28", "GP2", "GP27", "GP18", "GP7"],
diff --git a/keyboards/keebio/kbo5000/rev1/config.h b/keyboards/keebio/kbo5000/rev1/config.h
index edc732d668..12f7f76c87 100644
--- a/keyboards/keebio/kbo5000/rev1/config.h
+++ b/keyboards/keebio/kbo5000/rev1/config.h
@@ -18,6 +18,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN F7
 #define CAPS_LOCK_LED_PIN B6
diff --git a/keyboards/keebio/kbo5000/rev1/keyboard.json b/keyboards/keebio/kbo5000/rev1/keyboard.json
index b42b7116db..68d791bfb9 100644
--- a/keyboards/keebio/kbo5000/rev1/keyboard.json
+++ b/keyboards/keebio/kbo5000/rev1/keyboard.json
@@ -52,6 +52,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "D2", "D3", "B7", "B1"],
diff --git a/keyboards/keebio/levinson/rev3/config.h b/keyboards/keebio/levinson/rev3/config.h
deleted file mode 100644
index 2c1ea67b7a..0000000000
--- a/keyboards/keebio/levinson/rev3/config.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-Copyright 2015 Jack Humbert
-Copyright 2018 Danny Nguyen <danny@keeb.io>
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D2
diff --git a/keyboards/keebio/levinson/rev3/keyboard.json b/keyboards/keebio/levinson/rev3/keyboard.json
index 995fb8327d..36c0c5dc9b 100644
--- a/keyboards/keebio/levinson/rev3/keyboard.json
+++ b/keyboards/keebio/levinson/rev3/keyboard.json
@@ -2,6 +2,9 @@
    "keyboard_name": "Levinson Rev. 3",
    "split": {
        "soft_serial_pin": "D0",
+        "handedness": {
+            "pin": "D2"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F4", "F7", "D3", "B5", "B4", "E6"],
diff --git a/keyboards/keebio/nyquist/rev3/config.h b/keyboards/keebio/nyquist/rev3/config.h
deleted file mode 100644
index 177b2832f5..0000000000
--- a/keyboards/keebio/nyquist/rev3/config.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
-Copyright 2017 Danny Nguyen <danny@keeb.io>
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D5
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-// #define NO_DEBUG
-/* disable print */
-// #define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/keebio/nyquist/rev3/keyboard.json b/keyboards/keebio/nyquist/rev3/keyboard.json
index 062b7ebeae..f975dde6b5 100644
--- a/keyboards/keebio/nyquist/rev3/keyboard.json
+++ b/keyboards/keebio/nyquist/rev3/keyboard.json
@@ -31,6 +31,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D5"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/keebio/nyquist/rev4/config.h b/keyboards/keebio/nyquist/rev4/config.h
index 37b015f821..e1e2d99458 100644
--- a/keyboards/keebio/nyquist/rev4/config.h
+++ b/keyboards/keebio/nyquist/rev4/config.h
@@ -3,8 +3,6 @@
 #pragma once
-#define SPLIT_HAND_PIN GP23
 #define USB_VBUS_PIN GP18
 #define SERIAL_USART_FULL_DUPLEX
diff --git a/keyboards/keebio/nyquist/rev4/keyboard.json b/keyboards/keebio/nyquist/rev4/keyboard.json
index ada4824b1c..cb5c3a39f9 100644
--- a/keyboards/keebio/nyquist/rev4/keyboard.json
+++ b/keyboards/keebio/nyquist/rev4/keyboard.json
@@ -21,6 +21,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "GP23"
+        },
        "matrix_pins": {
            "right":{
                "cols": ["GP25", "GP29", "GP20", "GP11", "GP3", "GP2"],
diff --git a/keyboards/keebio/quefrency/rev1/config.h b/keyboards/keebio/quefrency/rev1/config.h
deleted file mode 100644
index c62ff4fef9..0000000000
--- a/keyboards/keebio/quefrency/rev1/config.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-Copyright 2015 Jack Humbert
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D2
diff --git a/keyboards/keebio/quefrency/rev1/keyboard.json b/keyboards/keebio/quefrency/rev1/keyboard.json
index 598fc55000..3dbee364d8 100644
--- a/keyboards/keebio/quefrency/rev1/keyboard.json
+++ b/keyboards/keebio/quefrency/rev1/keyboard.json
@@ -34,6 +34,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "soft_serial_pin": "D0",
+        "handedness": {
+            "pin": "D2"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F5", "F6", "F7", "B1", "B3", "B2", "B6", "C6"],
diff --git a/keyboards/keebio/quefrency/rev2/config.h b/keyboards/keebio/quefrency/rev2/config.h
index edc732d668..12f7f76c87 100644
--- a/keyboards/keebio/quefrency/rev2/config.h
+++ b/keyboards/keebio/quefrency/rev2/config.h
@@ -18,6 +18,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN F7
 #define CAPS_LOCK_LED_PIN B6
diff --git a/keyboards/keebio/quefrency/rev2/keyboard.json b/keyboards/keebio/quefrency/rev2/keyboard.json
index 0529fa13a6..aacb72994a 100644
--- a/keyboards/keebio/quefrency/rev2/keyboard.json
+++ b/keyboards/keebio/quefrency/rev2/keyboard.json
@@ -50,6 +50,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "C7", "D3", "B7"],
diff --git a/keyboards/keebio/quefrency/rev3/config.h b/keyboards/keebio/quefrency/rev3/config.h
index edc732d668..12f7f76c87 100644
--- a/keyboards/keebio/quefrency/rev3/config.h
+++ b/keyboards/keebio/quefrency/rev3/config.h
@@ -18,6 +18,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN F7
 #define CAPS_LOCK_LED_PIN B6
diff --git a/keyboards/keebio/quefrency/rev3/keyboard.json b/keyboards/keebio/quefrency/rev3/keyboard.json
index bd8d86f884..6dd8889a2b 100644
--- a/keyboards/keebio/quefrency/rev3/keyboard.json
+++ b/keyboards/keebio/quefrency/rev3/keyboard.json
@@ -50,6 +50,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "C7", "D3", "B7"],
diff --git a/keyboards/keebio/quefrency/rev4/config.h b/keyboards/keebio/quefrency/rev4/config.h
index 0435a34e7f..572ff9a83a 100644
--- a/keyboards/keebio/quefrency/rev4/config.h
+++ b/keyboards/keebio/quefrency/rev4/config.h
@@ -16,6 +16,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN F7
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/quefrency/rev4/keyboard.json b/keyboards/keebio/quefrency/rev4/keyboard.json
index 8cf21b4962..ef60302c74 100644
--- a/keyboards/keebio/quefrency/rev4/keyboard.json
+++ b/keyboards/keebio/quefrency/rev4/keyboard.json
@@ -47,6 +47,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "C7", "D3", "B7"],
diff --git a/keyboards/keebio/quefrency/rev5/config.h b/keyboards/keebio/quefrency/rev5/config.h
index 0435a34e7f..572ff9a83a 100644
--- a/keyboards/keebio/quefrency/rev5/config.h
+++ b/keyboards/keebio/quefrency/rev5/config.h
@@ -16,6 +16,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN F7
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/quefrency/rev5/keyboard.json b/keyboards/keebio/quefrency/rev5/keyboard.json
index b5f9c994af..96b4fa5d26 100644
--- a/keyboards/keebio/quefrency/rev5/keyboard.json
+++ b/keyboards/keebio/quefrency/rev5/keyboard.json
@@ -47,6 +47,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "C7", "D3", "B7"],
diff --git a/keyboards/keebio/sinc/rev1/config.h b/keyboards/keebio/sinc/rev1/config.h
index 80762574ab..572ff9a83a 100644
--- a/keyboards/keebio/sinc/rev1/config.h
+++ b/keyboards/keebio/sinc/rev1/config.h
@@ -16,7 +16,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-// wiring of each half
-#define SPLIT_HAND_PIN F7
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/sinc/rev1/keyboard.json b/keyboards/keebio/sinc/rev1/keyboard.json
index 7a5cb29298..929d0c0d82 100644
--- a/keyboards/keebio/sinc/rev1/keyboard.json
+++ b/keyboards/keebio/sinc/rev1/keyboard.json
@@ -39,6 +39,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "C7", "D3", "B7"],
diff --git a/keyboards/keebio/sinc/rev2/config.h b/keyboards/keebio/sinc/rev2/config.h
index 80762574ab..572ff9a83a 100644
--- a/keyboards/keebio/sinc/rev2/config.h
+++ b/keyboards/keebio/sinc/rev2/config.h
@@ -16,7 +16,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-// wiring of each half
-#define SPLIT_HAND_PIN F7
 #define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
diff --git a/keyboards/keebio/sinc/rev2/keyboard.json b/keyboards/keebio/sinc/rev2/keyboard.json
index e68370cb6c..71d1f62279 100644
--- a/keyboards/keebio/sinc/rev2/keyboard.json
+++ b/keyboards/keebio/sinc/rev2/keyboard.json
@@ -39,6 +39,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F7"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["F1", "F0", "F4", "F5", "F6", "D5", "C7", "D3", "B7"],
diff --git a/keyboards/keebio/sinc/rev3/config.h b/keyboards/keebio/sinc/rev3/config.h
index 89c8c0f3d8..3771f8da1d 100644
--- a/keyboards/keebio/sinc/rev3/config.h
+++ b/keyboards/keebio/sinc/rev3/config.h
@@ -16,8 +16,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN GP4
 #define SERIAL_USART_FULL_DUPLEX
 #define SERIAL_USART_TX_PIN GP0
 #define SERIAL_USART_RX_PIN GP1
diff --git a/keyboards/keebio/sinc/rev3/keyboard.json b/keyboards/keebio/sinc/rev3/keyboard.json
index 81b5e1c4c0..9ee599dd20 100644
--- a/keyboards/keebio/sinc/rev3/keyboard.json
+++ b/keyboards/keebio/sinc/rev3/keyboard.json
@@ -20,6 +20,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "GP4"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["GP29", "GP28", "GP27", "GP7", "GP2", "GP3", "GP11", "GP12", "GP13"],
diff --git a/keyboards/keebio/sinc/rev4/config.h b/keyboards/keebio/sinc/rev4/config.h
index 0a9b9846eb..5042d0c924 100644
--- a/keyboards/keebio/sinc/rev4/config.h
+++ b/keyboards/keebio/sinc/rev4/config.h
@@ -3,8 +3,6 @@
 #pragma once
-#define SPLIT_HAND_PIN GP4
 #define USB_VBUS_PIN GP14
 #define SERIAL_USART_FULL_DUPLEX
diff --git a/keyboards/keebio/sinc/rev4/keyboard.json b/keyboards/keebio/sinc/rev4/keyboard.json
index bfbceef02e..63b8994e8b 100644
--- a/keyboards/keebio/sinc/rev4/keyboard.json
+++ b/keyboards/keebio/sinc/rev4/keyboard.json
@@ -20,6 +20,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "GP4"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["GP29", "GP28", "GP27", "GP7", "GP2", "GP3", "GP11", "GP12", "GP13"],
diff --git a/keyboards/keebio/viterbi/rev2/config.h b/keyboards/keebio/viterbi/rev2/config.h
deleted file mode 100644
index 5b609ab777..0000000000
--- a/keyboards/keebio/viterbi/rev2/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2017 Danny Nguyen <danny@hexwire.com>
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D2
diff --git a/keyboards/keebio/viterbi/rev2/keyboard.json b/keyboards/keebio/viterbi/rev2/keyboard.json
index 599529a365..58d921da94 100644
--- a/keyboards/keebio/viterbi/rev2/keyboard.json
+++ b/keyboards/keebio/viterbi/rev2/keyboard.json
@@ -1,6 +1,9 @@
 {
    "keyboard_name": "Viterbi Rev. 2",
    "split": {
+        "handedness": {
+            "pin": "D2"
+        },
        "soft_serial_pin": "D0"
    },
    "usb": {
diff --git a/keyboards/maple_computing/lets_split_eh/config.h b/keyboards/maple_computing/lets_split_eh/config.h
index 38cf73ae1e..22b97cfb6a 100644
--- a/keyboards/maple_computing/lets_split_eh/config.h
+++ b/keyboards/maple_computing/lets_split_eh/config.h
@@ -18,9 +18,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-/* Split Defines */
-#define SPLIT_HAND_PIN D3
 // The 'EH' has previously forced use of I2C so this default has been kept
 // however users can undef to use serial
 #define USE_I2C
diff --git a/keyboards/maple_computing/lets_split_eh/keyboard.json b/keyboards/maple_computing/lets_split_eh/keyboard.json
index 62d489d60c..5624f12ac1 100644
--- a/keyboards/maple_computing/lets_split_eh/keyboard.json
+++ b/keyboards/maple_computing/lets_split_eh/keyboard.json
@@ -38,6 +38,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D3"
+        },
        "soft_serial_pin": "D0"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/mlego/m60_split/rev1/config.h b/keyboards/mlego/m60_split/rev1/config.h
index 564add296d..9f991d0fcc 100644
--- a/keyboards/mlego/m60_split/rev1/config.h
+++ b/keyboards/mlego/m60_split/rev1/config.h
@@ -15,6 +15,5 @@
 */
 #pragma once
-#define SPLIT_HAND_PIN B9
 #define SERIAL_USART_TX_PIN B6
 #define SERIAL_USART_SPEED 921600
diff --git a/keyboards/mlego/m60_split/rev1/keyboard.json b/keyboards/mlego/m60_split/rev1/keyboard.json
index b4753a1d9e..cbd951dac9 100644
--- a/keyboards/mlego/m60_split/rev1/keyboard.json
+++ b/keyboards/mlego/m60_split/rev1/keyboard.json
@@ -63,6 +63,9 @@
        "bootmagic": {
            "matrix": [5, 0]
        },
+        "handedness": {
+            "pin": "B9"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["B0", "A3", "A2", "A1", "B7", "B5"],
diff --git a/keyboards/mlego/m60_split/rev2/config.h b/keyboards/mlego/m60_split/rev2/config.h
index 82ea1b37e3..49218935d7 100644
--- a/keyboards/mlego/m60_split/rev2/config.h
+++ b/keyboards/mlego/m60_split/rev2/config.h
@@ -15,7 +15,6 @@
 */
 #pragma once
-#define SPLIT_HAND_PIN B9
 #define SERIAL_USART_TX_PIN B6
 #define SERIAL_USART_SPEED 921600
diff --git a/keyboards/mlego/m60_split/rev2/keyboard.json b/keyboards/mlego/m60_split/rev2/keyboard.json
index 08dcd19573..d8029696a8 100644
--- a/keyboards/mlego/m60_split/rev2/keyboard.json
+++ b/keyboards/mlego/m60_split/rev2/keyboard.json
@@ -56,6 +56,9 @@
        "bootmagic": {
            "matrix": [5, 0]
        },
+        "handedness": {
+            "pin": "B9"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["B0", "A3", "A2", "A1", "B7", "B5"],
diff --git a/keyboards/nacly/sodium42/config.h b/keyboards/nacly/sodium42/config.h
deleted file mode 100644
index fe3f0e0cc9..0000000000
--- a/keyboards/nacly/sodium42/config.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* Copyright 2022 NaCly
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN F4
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-// #define NO_DEBUG
-/* disable print */
-// #define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/nacly/sodium42/keyboard.json b/keyboards/nacly/sodium42/keyboard.json
index 491a2cf955..ba4f386ca1 100644
--- a/keyboards/nacly/sodium42/keyboard.json
+++ b/keyboards/nacly/sodium42/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "F4"
+        },
        "soft_serial_pin": "D3"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/nacly/sodium50/config.h b/keyboards/nacly/sodium50/config.h
deleted file mode 100644
index fe3f0e0cc9..0000000000
--- a/keyboards/nacly/sodium50/config.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* Copyright 2022 NaCly
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#pragma once
-#define SPLIT_HAND_PIN F4
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-// #define NO_DEBUG
-/* disable print */
-// #define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/nacly/sodium50/keyboard.json b/keyboards/nacly/sodium50/keyboard.json
index ec0edbfd9a..4144b6a473 100644
--- a/keyboards/nacly/sodium50/keyboard.json
+++ b/keyboards/nacly/sodium50/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "F4"
+        },
        "soft_serial_pin": "D3"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/nacly/sodium62/config.h b/keyboards/nacly/sodium62/config.h
index 341e0e0d89..09240d0b50 100644
--- a/keyboards/nacly/sodium62/config.h
+++ b/keyboards/nacly/sodium62/config.h
@@ -16,8 +16,6 @@
 #pragma once
-#define SPLIT_HAND_PIN F4
 #define OLED_BRIGHTNESS 128
 /*
diff --git a/keyboards/nacly/sodium62/keyboard.json b/keyboards/nacly/sodium62/keyboard.json
index 2d9f01e801..1e181eebab 100644
--- a/keyboards/nacly/sodium62/keyboard.json
+++ b/keyboards/nacly/sodium62/keyboard.json
@@ -30,6 +30,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "F4"
+        },
        "soft_serial_pin": "D3"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/nacly/splitreus62/config.h b/keyboards/nacly/splitreus62/config.h
deleted file mode 100644
index b4f9d582ce..0000000000
--- a/keyboards/nacly/splitreus62/config.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-Copyright 2015 Jack Humbert
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN F4
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-// #define NO_DEBUG
-/* disable print */
-// #define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/nacly/splitreus62/keyboard.json b/keyboards/nacly/splitreus62/keyboard.json
index 08a8010483..e46d4be668 100644
--- a/keyboards/nacly/splitreus62/keyboard.json
+++ b/keyboards/nacly/splitreus62/keyboard.json
@@ -30,6 +30,9 @@
    "diode_direction": "ROW2COL",
    "split": {
      "enabled": true,
+      "handedness": {
+        "pin": "F4"
+      },
      "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/ogre/ergo_split/config.h b/keyboards/ogre/ergo_split/config.h
deleted file mode 100644
index 9c0eb3b7a9..0000000000
--- a/keyboards/ogre/ergo_split/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2020 ctrlshiftba
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D1
diff --git a/keyboards/ogre/ergo_split/keyboard.json b/keyboards/ogre/ergo_split/keyboard.json
index 765bebc2fb..ff06b079c0 100644
--- a/keyboards/ogre/ergo_split/keyboard.json
+++ b/keyboards/ogre/ergo_split/keyboard.json
@@ -24,6 +24,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D1"
+        },
        "soft_serial_pin": "D3"
    },
    "rgblight": {
diff --git a/keyboards/phoenix/config.h b/keyboards/phoenix/config.h
index 4903f19f7f..732d906419 100644
--- a/keyboards/phoenix/config.h
+++ b/keyboards/phoenix/config.h
@@ -23,6 +23,5 @@
 #define MOUSEKEY_MAX_SPEED   7
 #define MOUSEKEY_WHEEL_DELAY 0
-#define SPLIT_HAND_PIN B9
 #define SERIAL_USART_DRIVER SD1
 #define SERIAL_USART_TX_PAL_MODE 7
diff --git a/keyboards/phoenix/keyboard.json b/keyboards/phoenix/keyboard.json
index 405b0ffd0a..ff13389245 100644
--- a/keyboards/phoenix/keyboard.json
+++ b/keyboards/phoenix/keyboard.json
@@ -30,10 +30,13 @@
    "diode_direction": "ROW2COL",
    "split": {
        "enabled": true,
-        "soft_serial_pin": "A9",
+        "handedness": {
+            "pin": "B9"
+        },
        "serial": {
            "driver": "usart"
-        }
+        },
+        "soft_serial_pin": "A9"
    },
    "processor": "STM32F401",
    "bootloader": "stm32-dfu",
diff --git a/keyboards/recompile_keys/choco60/rev1/config.h b/keyboards/recompile_keys/choco60/rev1/config.h
deleted file mode 100644
index ba9e3a474e..0000000000
--- a/keyboards/recompile_keys/choco60/rev1/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2019 Naoto Takai
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D0
diff --git a/keyboards/recompile_keys/choco60/rev1/keyboard.json b/keyboards/recompile_keys/choco60/rev1/keyboard.json
index 916c3de8d0..150037acee 100644
--- a/keyboards/recompile_keys/choco60/rev1/keyboard.json
+++ b/keyboards/recompile_keys/choco60/rev1/keyboard.json
@@ -12,6 +12,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D0"
+        },
        "soft_serial_pin": "D3"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/recompile_keys/choco60/rev2/config.h b/keyboards/recompile_keys/choco60/rev2/config.h
index e081d748ce..35a347ee91 100644
--- a/keyboards/recompile_keys/choco60/rev2/config.h
+++ b/keyboards/recompile_keys/choco60/rev2/config.h
@@ -17,6 +17,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN D1
 #define SPLIT_USB_DETECT
diff --git a/keyboards/recompile_keys/choco60/rev2/keyboard.json b/keyboards/recompile_keys/choco60/rev2/keyboard.json
index fbc947a9f0..47c5a0beb9 100644
--- a/keyboards/recompile_keys/choco60/rev2/keyboard.json
+++ b/keyboards/recompile_keys/choco60/rev2/keyboard.json
@@ -12,6 +12,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D1"
+        },
        "soft_serial_pin": "D0",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/recompile_keys/cocoa40/config.h b/keyboards/recompile_keys/cocoa40/config.h
deleted file mode 100644
index 976a698c5d..0000000000
--- a/keyboards/recompile_keys/cocoa40/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2019 'Naoto Takai'
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D3
diff --git a/keyboards/recompile_keys/cocoa40/keyboard.json b/keyboards/recompile_keys/cocoa40/keyboard.json
index f964ff6621..465cd395c7 100644
--- a/keyboards/recompile_keys/cocoa40/keyboard.json
+++ b/keyboards/recompile_keys/cocoa40/keyboard.json
@@ -23,6 +23,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D3"
+        },
        "soft_serial_pin": "D2"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/rgbkb/sol3/rev1/config.h b/keyboards/rgbkb/sol3/rev1/config.h
index a99cbd5fff..9e28ef25fb 100644
--- a/keyboards/rgbkb/sol3/rev1/config.h
+++ b/keyboards/rgbkb/sol3/rev1/config.h
@@ -24,7 +24,6 @@
 #define CRC8_USE_TABLE
 /* Split Keyboard Configuration */
-#define SPLIT_HAND_PIN C13
 #define SPLIT_USB_DETECT
 #define SERIAL_USART_TX_PAL_MODE 7
 #define SERIAL_USART_TIMEOUT 5
diff --git a/keyboards/rgbkb/sol3/rev1/keyboard.json b/keyboards/rgbkb/sol3/rev1/keyboard.json
index 2ff3b03b0a..edf70636e7 100644
--- a/keyboards/rgbkb/sol3/rev1/keyboard.json
+++ b/keyboards/rgbkb/sol3/rev1/keyboard.json
@@ -140,6 +140,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "C13"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["B9", "B8", "B4", "A6", "A3", "B10", "B12", "B11"],
diff --git a/keyboards/salicylic_acid3/7skb/rev1/config.h b/keyboards/salicylic_acid3/7skb/rev1/config.h
index c1a6005b58..b2fb659185 100644
--- a/keyboards/salicylic_acid3/7skb/rev1/config.h
+++ b/keyboards/salicylic_acid3/7skb/rev1/config.h
@@ -18,8 +18,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B6
 #ifndef IOS_DEVICE_ENABLE
  #define RGBLIGHT_LIMIT_VAL 180
  #define RGBLIGHT_VAL_STEP 17
diff --git a/keyboards/salicylic_acid3/7skb/rev1/keyboard.json b/keyboards/salicylic_acid3/7skb/rev1/keyboard.json
index 73b3c0bec7..864e1835fd 100644
--- a/keyboards/salicylic_acid3/7skb/rev1/keyboard.json
+++ b/keyboards/salicylic_acid3/7skb/rev1/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D2"
    },
    "rgblight": {
diff --git a/keyboards/salicylic_acid3/7splus/config.h b/keyboards/salicylic_acid3/7splus/config.h
index 1139de696f..c3e6b774cc 100644
--- a/keyboards/salicylic_acid3/7splus/config.h
+++ b/keyboards/salicylic_acid3/7splus/config.h
@@ -17,8 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B6
 #ifndef IOS_DEVICE_ENABLE
  #define RGBLIGHT_LIMIT_VAL 180
  #define RGBLIGHT_VAL_STEP 17
diff --git a/keyboards/salicylic_acid3/7splus/keyboard.json b/keyboards/salicylic_acid3/7splus/keyboard.json
index c33e79b52f..c33d00d867 100644
--- a/keyboards/salicylic_acid3/7splus/keyboard.json
+++ b/keyboards/salicylic_acid3/7splus/keyboard.json
@@ -30,6 +30,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D2"
    },
    "rgblight": {
diff --git a/keyboards/salicylic_acid3/ajisai74/config.h b/keyboards/salicylic_acid3/ajisai74/config.h
deleted file mode 100644
index 9e47a9c2b4..0000000000
--- a/keyboards/salicylic_acid3/ajisai74/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2020 Salicylic_Acid
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN B6
diff --git a/keyboards/salicylic_acid3/ajisai74/keyboard.json b/keyboards/salicylic_acid3/ajisai74/keyboard.json
index fd00800715..41abc9c623 100644
--- a/keyboards/salicylic_acid3/ajisai74/keyboard.json
+++ b/keyboards/salicylic_acid3/ajisai74/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D2"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/salicylic_acid3/ergoarrows/config.h b/keyboards/salicylic_acid3/ergoarrows/config.h
index 3b5e630f48..fd6b0e51b5 100644
--- a/keyboards/salicylic_acid3/ergoarrows/config.h
+++ b/keyboards/salicylic_acid3/ergoarrows/config.h
@@ -17,8 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B6
 #ifndef IOS_DEVICE_ENABLE
  #define RGBLIGHT_LIMIT_VAL 90
  #define RGBLIGHT_VAL_STEP 17
diff --git a/keyboards/salicylic_acid3/ergoarrows/keyboard.json b/keyboards/salicylic_acid3/ergoarrows/keyboard.json
index 0993eb1b9b..41cb0da90f 100644
--- a/keyboards/salicylic_acid3/ergoarrows/keyboard.json
+++ b/keyboards/salicylic_acid3/ergoarrows/keyboard.json
@@ -30,6 +30,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/salicylic_acid3/guide68/config.h b/keyboards/salicylic_acid3/guide68/config.h
deleted file mode 100644
index 5e88a02bce..0000000000
--- a/keyboards/salicylic_acid3/guide68/config.h
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright 2022 Salicylic-acid3 (@Salicylic-acid3)
-// SPDX-License-Identifier: GPL-2.0-or-later
-#pragma once
-#define SPLIT_HAND_PIN B6
diff --git a/keyboards/salicylic_acid3/guide68/keyboard.json b/keyboards/salicylic_acid3/guide68/keyboard.json
index 09993a1138..629afac8f7 100644
--- a/keyboards/salicylic_acid3/guide68/keyboard.json
+++ b/keyboards/salicylic_acid3/guide68/keyboard.json
@@ -48,6 +48,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "transport": {
            "protocol": "serial"
        },
diff --git a/keyboards/salicylic_acid3/jisplit89/rev1/config.h b/keyboards/salicylic_acid3/jisplit89/rev1/config.h
index fb6c21aec8..25ba2f576b 100644
--- a/keyboards/salicylic_acid3/jisplit89/rev1/config.h
+++ b/keyboards/salicylic_acid3/jisplit89/rev1/config.h
@@ -17,8 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B6
 #ifndef IOS_DEVICE_ENABLE
  #define RGBLIGHT_LIMIT_VAL 180
  #define RGBLIGHT_VAL_STEP 17
diff --git a/keyboards/salicylic_acid3/jisplit89/rev1/keyboard.json b/keyboards/salicylic_acid3/jisplit89/rev1/keyboard.json
index e36b27bd2f..d17e0fd3bc 100644
--- a/keyboards/salicylic_acid3/jisplit89/rev1/keyboard.json
+++ b/keyboards/salicylic_acid3/jisplit89/rev1/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D2"
    },
    "rgblight": {
diff --git a/keyboards/salicylic_acid3/nknl7en/config.h b/keyboards/salicylic_acid3/nknl7en/config.h
index 5b4a4a25f3..8e18bdb850 100644
--- a/keyboards/salicylic_acid3/nknl7en/config.h
+++ b/keyboards/salicylic_acid3/nknl7en/config.h
@@ -17,8 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B6
 #ifndef IOS_DEVICE_ENABLE
  #define RGBLIGHT_LIMIT_VAL 180
  #define RGBLIGHT_VAL_STEP 17
diff --git a/keyboards/salicylic_acid3/nknl7en/keyboard.json b/keyboards/salicylic_acid3/nknl7en/keyboard.json
index 25165663f5..c41be45376 100644
--- a/keyboards/salicylic_acid3/nknl7en/keyboard.json
+++ b/keyboards/salicylic_acid3/nknl7en/keyboard.json
@@ -30,6 +30,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/salicylic_acid3/nknl7jp/config.h b/keyboards/salicylic_acid3/nknl7jp/config.h
index 5b4a4a25f3..8e18bdb850 100644
--- a/keyboards/salicylic_acid3/nknl7jp/config.h
+++ b/keyboards/salicylic_acid3/nknl7jp/config.h
@@ -17,8 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B6
 #ifndef IOS_DEVICE_ENABLE
  #define RGBLIGHT_LIMIT_VAL 180
  #define RGBLIGHT_VAL_STEP 17
diff --git a/keyboards/salicylic_acid3/nknl7jp/keyboard.json b/keyboards/salicylic_acid3/nknl7jp/keyboard.json
index 179860ea29..2fab8e8f7e 100644
--- a/keyboards/salicylic_acid3/nknl7jp/keyboard.json
+++ b/keyboards/salicylic_acid3/nknl7jp/keyboard.json
@@ -30,6 +30,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {
diff --git a/keyboards/sparrow62/config.h b/keyboards/sparrow62/config.h
deleted file mode 100644
index 2b9669e938..0000000000
--- a/keyboards/sparrow62/config.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
-Copyright 2020 Atsushi Morimoto @74th
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN F4
diff --git a/keyboards/sparrow62/keyboard.json b/keyboards/sparrow62/keyboard.json
index 796d18b9bb..6f5ebd540f 100644
--- a/keyboards/sparrow62/keyboard.json
+++ b/keyboards/sparrow62/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "F4"
+        },
        "soft_serial_pin": "D2"
    },
    "processor": "atmega32u4",
diff --git a/keyboards/splitkb/aurora/corne/rev1/config.h b/keyboards/splitkb/aurora/corne/rev1/config.h
index f37b59a952..5a5910d81c 100644
--- a/keyboards/splitkb/aurora/corne/rev1/config.h
+++ b/keyboards/splitkb/aurora/corne/rev1/config.h
@@ -16,10 +16,6 @@
 #pragma once
-// `SPLIT_HAND_PIN` can currently be defined in `info.json`,
-// but can't yet be given a value
-#define SPLIT_HAND_PIN F4
 // Not yet available in `info.json`
 #ifdef OLED_ENABLE
 #    define OLED_DISPLAY_128X32
diff --git a/keyboards/splitkb/aurora/corne/rev1/keyboard.json b/keyboards/splitkb/aurora/corne/rev1/keyboard.json
index 2e0b74b5a8..cf3516f34f 100644
--- a/keyboards/splitkb/aurora/corne/rev1/keyboard.json
+++ b/keyboards/splitkb/aurora/corne/rev1/keyboard.json
@@ -96,6 +96,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F4"
+        },
        "transport": {
            "sync": {
                "matrix_state": true
diff --git a/keyboards/splitkb/aurora/helix/rev1/config.h b/keyboards/splitkb/aurora/helix/rev1/config.h
index f8b8a190fe..522bea4d5e 100644
--- a/keyboards/splitkb/aurora/helix/rev1/config.h
+++ b/keyboards/splitkb/aurora/helix/rev1/config.h
@@ -16,7 +16,5 @@
 #pragma once
-#define SPLIT_HAND_PIN D3
 #define OLED_DISPLAY_128X32
 #define SPLIT_OLED_ENABLE
diff --git a/keyboards/splitkb/aurora/helix/rev1/keyboard.json b/keyboards/splitkb/aurora/helix/rev1/keyboard.json
index b3fcf8969c..1844e5951e 100644
--- a/keyboards/splitkb/aurora/helix/rev1/keyboard.json
+++ b/keyboards/splitkb/aurora/helix/rev1/keyboard.json
@@ -118,6 +118,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "D3"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["D4", "C6", "D7", "E6", "B4", "B5", "B6"],
diff --git a/keyboards/splitkb/aurora/lily58/rev1/config.h b/keyboards/splitkb/aurora/lily58/rev1/config.h
index 08a61a2978..5a5910d81c 100644
--- a/keyboards/splitkb/aurora/lily58/rev1/config.h
+++ b/keyboards/splitkb/aurora/lily58/rev1/config.h
@@ -16,10 +16,6 @@
 #pragma once
-// `SPLIT_HAND_PIN` can currently be defined in `info.json`,
-// but can't yet be given a value
-#define SPLIT_HAND_PIN F5
 // Not yet available in `info.json`
 #ifdef OLED_ENABLE
 #    define OLED_DISPLAY_128X32
diff --git a/keyboards/splitkb/aurora/lily58/rev1/keyboard.json b/keyboards/splitkb/aurora/lily58/rev1/keyboard.json
index f81da08464..1284fc2319 100644
--- a/keyboards/splitkb/aurora/lily58/rev1/keyboard.json
+++ b/keyboards/splitkb/aurora/lily58/rev1/keyboard.json
@@ -107,6 +107,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F5"
+        },
        "transport": {
            "sync": {
                "matrix_state": true
diff --git a/keyboards/splitkb/aurora/sofle_v2/rev1/config.h b/keyboards/splitkb/aurora/sofle_v2/rev1/config.h
index 7292b3d8b0..522bea4d5e 100644
--- a/keyboards/splitkb/aurora/sofle_v2/rev1/config.h
+++ b/keyboards/splitkb/aurora/sofle_v2/rev1/config.h
@@ -16,7 +16,5 @@
 #pragma once
-#define SPLIT_HAND_PIN F4
 #define OLED_DISPLAY_128X32
 #define SPLIT_OLED_ENABLE
diff --git a/keyboards/splitkb/aurora/sofle_v2/rev1/keyboard.json b/keyboards/splitkb/aurora/sofle_v2/rev1/keyboard.json
index 266ea72148..8b702c4001 100644
--- a/keyboards/splitkb/aurora/sofle_v2/rev1/keyboard.json
+++ b/keyboards/splitkb/aurora/sofle_v2/rev1/keyboard.json
@@ -112,6 +112,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F4"
+        },
        "matrix_pins": {
            "right": {
                "cols": ["D7", "E6", "B4", "B5", "D4", "C6"],
diff --git a/keyboards/splitkb/aurora/sweep/rev1/config.h b/keyboards/splitkb/aurora/sweep/rev1/config.h
index f37b59a952..5a5910d81c 100644
--- a/keyboards/splitkb/aurora/sweep/rev1/config.h
+++ b/keyboards/splitkb/aurora/sweep/rev1/config.h
@@ -16,10 +16,6 @@
 #pragma once
-// `SPLIT_HAND_PIN` can currently be defined in `info.json`,
-// but can't yet be given a value
-#define SPLIT_HAND_PIN F4
 // Not yet available in `info.json`
 #ifdef OLED_ENABLE
 #    define OLED_DISPLAY_128X32
diff --git a/keyboards/splitkb/aurora/sweep/rev1/keyboard.json b/keyboards/splitkb/aurora/sweep/rev1/keyboard.json
index 0d235cd5b2..eb62369603 100644
--- a/keyboards/splitkb/aurora/sweep/rev1/keyboard.json
+++ b/keyboards/splitkb/aurora/sweep/rev1/keyboard.json
@@ -93,6 +93,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "F4"
+        },
        "transport": {
            "sync": {
                "matrix_state": true
diff --git a/keyboards/splitkb/kyria/rev3/config.h b/keyboards/splitkb/kyria/rev3/config.h
index 7938384a78..3f731859fc 100644
--- a/keyboards/splitkb/kyria/rev3/config.h
+++ b/keyboards/splitkb/kyria/rev3/config.h
@@ -16,9 +16,5 @@
 #pragma once
-// `SPLIT_HAND_PIN` can currently be defined in `info.json`,
-// but can't yet be given a value
-#define SPLIT_HAND_PIN B5
 #define OLED_DISPLAY_128X64
 #define SPLIT_OLED_ENABLE
diff --git a/keyboards/splitkb/kyria/rev3/keyboard.json b/keyboards/splitkb/kyria/rev3/keyboard.json
index 750f87ae4b..a2f21826e8 100644
--- a/keyboards/splitkb/kyria/rev3/keyboard.json
+++ b/keyboards/splitkb/kyria/rev3/keyboard.json
@@ -109,6 +109,9 @@
                ]
            }
        },
+        "handedness": {
+            "pin": "B5"
+        },
        "transport": {
            "sync": {
                "matrix_state": true
diff --git a/keyboards/takashiski/otaku_split/rev1/config.h b/keyboards/takashiski/otaku_split/rev1/config.h
deleted file mode 100644
index 8bede1c421..0000000000
--- a/keyboards/takashiski/otaku_split/rev1/config.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
-Copyright 2019 takashiski
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#pragma once
-#define SPLIT_HAND_PIN D2 //fix pin. HIGH is left, LOW is right
-/*
- * Feature disable options
- *  These options are also useful to firmware size reduction.
- */
-/* disable debug print */
-//#define NO_DEBUG
-/* disable print */
-//#define NO_PRINT
-/* disable action features */
-//#define NO_ACTION_LAYER
-//#define NO_ACTION_TAPPING
-//#define NO_ACTION_ONESHOT
diff --git a/keyboards/takashiski/otaku_split/rev1/keyboard.json b/keyboards/takashiski/otaku_split/rev1/keyboard.json
index 039838144f..d4195b5a90 100644
--- a/keyboards/takashiski/otaku_split/rev1/keyboard.json
+++ b/keyboards/takashiski/otaku_split/rev1/keyboard.json
@@ -29,6 +29,9 @@
    "diode_direction": "COL2ROW",
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "D2"
+        },
        "soft_serial_pin": "D0",
        "matrix_pins": {
            "right": {
diff --git a/keyboards/tzarc/djinn/rev1/config.h b/keyboards/tzarc/djinn/rev1/config.h
index 7c8dc042f3..9eb275fc5b 100644
--- a/keyboards/tzarc/djinn/rev1/config.h
+++ b/keyboards/tzarc/djinn/rev1/config.h
@@ -3,7 +3,6 @@
 #pragma once
 // Split configuration
-#define SPLIT_HAND_PIN B11
 #ifdef USE_PLUG_DETECT_PIN
 #    define USB_VBUS_PIN B12
 #endif
diff --git a/keyboards/tzarc/djinn/rev1/keyboard.json b/keyboards/tzarc/djinn/rev1/keyboard.json
index a0422dea93..b6ee5acba1 100644
--- a/keyboards/tzarc/djinn/rev1/keyboard.json
+++ b/keyboards/tzarc/djinn/rev1/keyboard.json
@@ -7,6 +7,9 @@
  },
  "split": {
    "soft_serial_pin": "B9",
+    "handedness": {
+      "pin": "B11"
+    },
    "usb_detect": {
      "enabled": true
    }
diff --git a/keyboards/tzarc/djinn/rev2/config.h b/keyboards/tzarc/djinn/rev2/config.h
index bc7fcb3712..b52c3c2c3d 100644
--- a/keyboards/tzarc/djinn/rev2/config.h
+++ b/keyboards/tzarc/djinn/rev2/config.h
@@ -3,7 +3,6 @@
 #pragma once
 // Split configuration
-#define SPLIT_HAND_PIN B9
 #define USB_VBUS_PIN B12
 #define SERIAL_USART_DRIVER SD3
 #define SERIAL_USART_PIN_SWAP
diff --git a/keyboards/tzarc/djinn/rev2/keyboard.json b/keyboards/tzarc/djinn/rev2/keyboard.json
index 33db91971e..e0f39d1f91 100644
--- a/keyboards/tzarc/djinn/rev2/keyboard.json
+++ b/keyboards/tzarc/djinn/rev2/keyboard.json
@@ -6,6 +6,9 @@
    "max_brightness": 144
  },
  "split": {
+    "handedness": {
+      "pin": "B9"
+    },
    "usb_detect": {
      "enabled": false
    }
diff --git a/keyboards/vitamins_included/rev2/config.h b/keyboards/vitamins_included/rev2/config.h
index 519af227a4..e88e6bac2c 100644
--- a/keyboards/vitamins_included/rev2/config.h
+++ b/keyboards/vitamins_included/rev2/config.h
@@ -19,9 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
-#define SPLIT_HAND_PIN B4
 /* Audio settings */
 #ifdef AUDIO_ENABLE
 #    define AUDIO_PIN C6  // Define this to enable the buzzer
diff --git a/keyboards/vitamins_included/rev2/keyboard.json b/keyboards/vitamins_included/rev2/keyboard.json
index 4418b86909..bead425252 100644
--- a/keyboards/vitamins_included/rev2/keyboard.json
+++ b/keyboards/vitamins_included/rev2/keyboard.json
@@ -15,6 +15,9 @@
    },
    "split": {
        "enabled": true,
+        "handedness": {
+            "pin": "B4"
+        },
        "soft_serial_pin": "D0"
    },
    "rgblight": {