127 files changed, 202 insertions, 86 deletions

diff --git a/keyboards/ai03/altair/keyboard.json b/keyboards/ai03/altair/keyboard.json
index 9626716cde..cf551ab79e 100644
--- a/keyboards/ai03/altair/keyboard.json
+++ b/keyboards/ai03/altair/keyboard.json
@@ -37,6 +37,9 @@
                 "rows": ["GP5", "GP16", "GP20", "GP28", "GP14"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "soft_serial_pin": "GP29"
     },
     "url": "https://ai03.com/",
diff --git a/keyboards/ai03/altair/rules.mk b/keyboards/ai03/altair/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/ai03/altair/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/ai03/altair_x/keyboard.json b/keyboards/ai03/altair_x/keyboard.json
index d1448ab8c2..1568f15a5a 100644
--- a/keyboards/ai03/altair_x/keyboard.json
+++ b/keyboards/ai03/altair_x/keyboard.json
@@ -37,6 +37,9 @@
                 "rows": ["GP16", "GP20", "GP28", "GP14"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "soft_serial_pin": "GP29"
     },
     "url": "https://ai03.com/",
diff --git a/keyboards/ai03/altair_x/rules.mk b/keyboards/ai03/altair_x/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/ai03/altair_x/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/aidansmithdotdev/sango/keyboard.json b/keyboards/aidansmithdotdev/sango/keyboard.json
index 6c62ac9bd2..c3d34ce6d7 100644
--- a/keyboards/aidansmithdotdev/sango/keyboard.json
+++ b/keyboards/aidansmithdotdev/sango/keyboard.json
@@ -127,6 +127,9 @@
                 "rows": ["GP2", "GP3", "GP4", "GP5", "GP6"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "soft_serial_pin": "GP1"
     },
     "url": "https://aidansmith.dev",
diff --git a/keyboards/aidansmithdotdev/sango/rules.mk b/keyboards/aidansmithdotdev/sango/rules.mk
deleted file mode 100644
index 743228e94b..0000000000
--- a/keyboards/aidansmithdotdev/sango/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
\ No newline at end of file
diff --git a/keyboards/arrowmechanics/wings/keyboard.json b/keyboards/arrowmechanics/wings/keyboard.json
index 1da4077baa..f0f0a9c442 100644
--- a/keyboards/arrowmechanics/wings/keyboard.json
+++ b/keyboards/arrowmechanics/wings/keyboard.json
@@ -188,6 +188,9 @@
     },
     "split": {
         "enabled": true,
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "layer_state": true,
diff --git a/keyboards/arrowmechanics/wings/rules.mk b/keyboards/arrowmechanics/wings/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/arrowmechanics/wings/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/beekeeb/piantor/keyboard.json b/keyboards/beekeeb/piantor/keyboard.json
index e4ecd4207e..77bfc3678c 100644
--- a/keyboards/beekeeb/piantor/keyboard.json
+++ b/keyboards/beekeeb/piantor/keyboard.json
@@ -40,6 +40,9 @@
                     ["GP15", "GP14", "GP16", null, null, null]
                 ]
             }
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "community_layouts": [
diff --git a/keyboards/beekeeb/piantor/rules.mk b/keyboards/beekeeb/piantor/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/beekeeb/piantor/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/beekeeb/piantor_pro/keyboard.json b/keyboards/beekeeb/piantor_pro/keyboard.json
index c85247550e..ad4890ae68 100644
--- a/keyboards/beekeeb/piantor_pro/keyboard.json
+++ b/keyboards/beekeeb/piantor_pro/keyboard.json
@@ -24,7 +24,10 @@
         "vid": "0xBEEB"
     },
     "split": {
-        "enabled": true
+        "enabled": true,
+        "serial": {
+            "driver": "vendor"
+        }
     },
     "community_layouts": [ "split_3x6_3" ],
     "layouts": {
diff --git a/keyboards/beekeeb/piantor_pro/rules.mk b/keyboards/beekeeb/piantor_pro/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/beekeeb/piantor_pro/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/boardsource/lulu/rp2040/keyboard.json b/keyboards/boardsource/lulu/rp2040/keyboard.json
index a1e8db89a9..db0b7a50c6 100644
--- a/keyboards/boardsource/lulu/rp2040/keyboard.json
+++ b/keyboards/boardsource/lulu/rp2040/keyboard.json
@@ -10,6 +10,11 @@
       {"pin_a": "GP8", "pin_b": "GP9"}
     ]
   },
+  "split": {
+    "serial": {
+      "driver": "vendor"
+    }
+  },
   "ws2812": {
     "pin": "GP29",
     "driver": "vendor"
diff --git a/keyboards/boardsource/lulu/rp2040/rules.mk b/keyboards/boardsource/lulu/rp2040/rules.mk
index 118c27fc6a..de6a3d8afc 100644
--- a/keyboards/boardsource/lulu/rp2040/rules.mk
+++ b/keyboards/boardsource/lulu/rp2040/rules.mk
@@ -1,2 +1 @@
-SERIAL_DRIVER = vendor
 SRC += lib/oled.c
diff --git a/keyboards/boardsource/unicorne/keyboard.json b/keyboards/boardsource/unicorne/keyboard.json
index 4fb63de9e3..f9d1a5e666 100644
--- a/keyboards/boardsource/unicorne/keyboard.json
+++ b/keyboards/boardsource/unicorne/keyboard.json
@@ -21,6 +21,9 @@
     "split": {
         "enabled": true,
         "soft_serial_pin": "GP0",
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "layer_state": true
diff --git a/keyboards/boardsource/unicorne/rules.mk b/keyboards/boardsource/unicorne/rules.mk
index 448962cf00..53d7e1b681 100644
--- a/keyboards/boardsource/unicorne/rules.mk
+++ b/keyboards/boardsource/unicorne/rules.mk
@@ -1,3 +1,2 @@
-SERIAL_DRIVER = vendor
 POINTING_DEVICE_DRIVER = analog_joystick
 SRC += lib/oled.c
diff --git a/keyboards/budgy/keyboard.json b/keyboards/budgy/keyboard.json
index 645336e8ad..0dc45c9da0 100644
--- a/keyboards/budgy/keyboard.json
+++ b/keyboards/budgy/keyboard.json
@@ -37,6 +37,9 @@
                     ["GP18", "GP17", null, null, null]
                 ]
             }
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "community_layouts": ["split_3x5_2"],
diff --git a/keyboards/budgy/rules.mk b/keyboards/budgy/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/budgy/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/cantor/keyboard.json b/keyboards/cantor/keyboard.json
index a9d84e6c8f..26b79c0280 100644
--- a/keyboards/cantor/keyboard.json
+++ b/keyboards/cantor/keyboard.json
@@ -39,6 +39,9 @@
                     ["A0", "A1", "A2", null, null, null]
                 ]
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "community_layouts": ["split_3x6_3"],
diff --git a/keyboards/cantor/rules.mk b/keyboards/cantor/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/cantor/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/chew/keyboard.json b/keyboards/chew/keyboard.json
index f6ddaa627d..94617257e8 100644
--- a/keyboards/chew/keyboard.json
+++ b/keyboards/chew/keyboard.json
@@ -32,6 +32,9 @@
                 ]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "watchdog": true
         }
diff --git a/keyboards/chew/rules.mk b/keyboards/chew/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/chew/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/controllerworks/mini36/keyboard.json b/keyboards/controllerworks/mini36/keyboard.json
index a3b5365109..dc0f63638f 100644
--- a/keyboards/controllerworks/mini36/keyboard.json
+++ b/keyboards/controllerworks/mini36/keyboard.json
@@ -40,6 +40,9 @@
             }
         },
         "soft_serial_pin": "GP1",
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "protocol": "serial",
             "sync": {
diff --git a/keyboards/controllerworks/mini36/rules.mk b/keyboards/controllerworks/mini36/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/controllerworks/mini36/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/controllerworks/mini42/keyboard.json b/keyboards/controllerworks/mini42/keyboard.json
index 5d1d56db1a..a1dc0df34c 100644
--- a/keyboards/controllerworks/mini42/keyboard.json
+++ b/keyboards/controllerworks/mini42/keyboard.json
@@ -40,6 +40,9 @@
             }
         },
         "soft_serial_pin": "GP1",
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "protocol": "serial",
             "sync": {
diff --git a/keyboards/controllerworks/mini42/rules.mk b/keyboards/controllerworks/mini42/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/controllerworks/mini42/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/elcantorhs/keyboard.json b/keyboards/elcantorhs/keyboard.json
index 6ed958463e..c0d52b915b 100644
--- a/keyboards/elcantorhs/keyboard.json
+++ b/keyboards/elcantorhs/keyboard.json
@@ -37,6 +37,9 @@
                     ["B12", "A0", "A1", "A2", null, null]
                 ]
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "layouts": {
diff --git a/keyboards/elcantorhs/rules.mk b/keyboards/elcantorhs/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/elcantorhs/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/era/sirind/tomak/keyboard.json b/keyboards/era/sirind/tomak/keyboard.json
index 1d0d5b79b2..a2f545cf5e 100644
--- a/keyboards/era/sirind/tomak/keyboard.json
+++ b/keyboards/era/sirind/tomak/keyboard.json
@@ -182,6 +182,9 @@
                 "rows": ["GP10", "GP11", "GP12", "GP28", "GP19", "GP16"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "indicators": true,
diff --git a/keyboards/era/sirind/tomak/rules.mk b/keyboards/era/sirind/tomak/rules.mk
deleted file mode 100644
index 743228e94b..0000000000
--- a/keyboards/era/sirind/tomak/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
\ No newline at end of file
diff --git a/keyboards/gregandcin/teaqueen/keyboard.json b/keyboards/gregandcin/teaqueen/keyboard.json
index 841c524e62..e4903ea6c0 100644
--- a/keyboards/gregandcin/teaqueen/keyboard.json
+++ b/keyboards/gregandcin/teaqueen/keyboard.json
@@ -25,7 +25,10 @@
                 "rows": ["GP5", "GP6", "GP7", "GP8", "GP9"]
             }
         },
-        "soft_serial_pin": "GP3"
+        "soft_serial_pin": "GP3",
+        "serial": {
+            "driver": "vendor"
+        }
     },
     "url": "https://github.com/gregandcin/teaqueen",
     "usb": {
diff --git a/keyboards/gregandcin/teaqueen/rules.mk b/keyboards/gregandcin/teaqueen/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/gregandcin/teaqueen/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/handwired/alcor_dactyl/keyboard.json b/keyboards/handwired/alcor_dactyl/keyboard.json
index c179278c09..b38d39bfcc 100644
--- a/keyboards/handwired/alcor_dactyl/keyboard.json
+++ b/keyboards/handwired/alcor_dactyl/keyboard.json
@@ -19,7 +19,10 @@
         "rgb_matrix": true
     },
     "split": {
-        "enabled": true
+        "enabled": true,
+        "serial": {
+            "driver": "vendor"
+        }
     },
     "diode_direction": "COL2ROW",
     "matrix_pins": {
diff --git a/keyboards/handwired/alcor_dactyl/rules.mk b/keyboards/handwired/alcor_dactyl/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/handwired/alcor_dactyl/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json
index 73ce0d27d5..517620097b 100644
--- a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json
+++ b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/keyboard.json
@@ -8,6 +8,9 @@
         "enabled": true,
         "bootmagic": {
             "matrix": [7, 0]
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "development_board": "blackpill_f411",
diff --git a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/rules.mk b/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/rules.mk
deleted file mode 100644
index c018471cad..0000000000
--- a/keyboards/handwired/dactyl_manuform/6x6/blackpill_f411/rules.mk
+++ /dev/null
@@ -1,3 +0,0 @@
-# split settings
-# https://beta.docs.qmk.fm/developing-qmk/c-development/hardware_drivers/serial_driver
-SERIAL_DRIVER = usart
diff --git a/keyboards/handwired/jankrp2040dactyl/keyboard.json b/keyboards/handwired/jankrp2040dactyl/keyboard.json
index c4543b5d12..0d155a70bd 100644
--- a/keyboards/handwired/jankrp2040dactyl/keyboard.json
+++ b/keyboards/handwired/jankrp2040dactyl/keyboard.json
@@ -6,7 +6,10 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "GP0"
+        "soft_serial_pin": "GP0",
+        "serial": {
+            "driver": "vendor"
+        }
     },
 
     "features": {
diff --git a/keyboards/handwired/jankrp2040dactyl/rules.mk b/keyboards/handwired/jankrp2040dactyl/rules.mk
deleted file mode 100644
index 743228e94b..0000000000
--- a/keyboards/handwired/jankrp2040dactyl/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
\ No newline at end of file
diff --git a/keyboards/handwired/riblee_split/keyboard.json b/keyboards/handwired/riblee_split/keyboard.json
index 49b5ca3a54..0a607036f9 100644
--- a/keyboards/handwired/riblee_split/keyboard.json
+++ b/keyboards/handwired/riblee_split/keyboard.json
@@ -25,6 +25,9 @@
     },
     "split": {
         "enabled": true,
+        "serial": {
+            "driver": "usart"
+        },
         "transport": {
             "sync_matrix_state": true
         }
diff --git a/keyboards/handwired/riblee_split/rules.mk b/keyboards/handwired/riblee_split/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/handwired/riblee_split/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/handwired/split65/stm32/keyboard.json b/keyboards/handwired/split65/stm32/keyboard.json
index 6763c5eb88..4f2d069aed 100644
--- a/keyboards/handwired/split65/stm32/keyboard.json
+++ b/keyboards/handwired/split65/stm32/keyboard.json
@@ -7,7 +7,10 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "A9"
+        "soft_serial_pin": "A9",
+        "serial": {
+            "driver": "usart"
+        }
     },
     "development_board": "proton_c",
     "features": {
diff --git a/keyboards/handwired/split65/stm32/rules.mk b/keyboards/handwired/split65/stm32/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/handwired/split65/stm32/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json b/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json
index 499390c610..a9bfd7ee55 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f303/keyboard.json
@@ -15,6 +15,11 @@
     "audio": {
         "driver": "dac_additive"
     },
+    "split": {
+        "serial": {
+            "driver": "usart"
+        }
+    },
     "ws2812": {
         "pin": "A6",
         "driver": "pwm"
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f303/rules.mk b/keyboards/handwired/tractyl_manuform/5x6_right/f303/rules.mk
deleted file mode 100644
index 22915ec000..0000000000
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f303/rules.mk
+++ /dev/null
@@ -1,3 +0,0 @@
-# KEYBOARD_SHARED_EP = yes
-
-SERIAL_DRIVER = usart
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json b/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json
index 7182ee1701..65124f3a3d 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f411/keyboard.json
@@ -18,6 +18,11 @@
     "audio": {
         "driver": "pwm_hardware"
     },
+    "split": {
+        "serial": {
+            "driver": "usart"
+        }
+    },
     "ws2812": {
         "pin": "A1",
         "driver": "pwm"
diff --git a/keyboards/handwired/tractyl_manuform/5x6_right/f411/rules.mk b/keyboards/handwired/tractyl_manuform/5x6_right/f411/rules.mk
index f26cbbced1..4aa582e7a2 100644
--- a/keyboards/handwired/tractyl_manuform/5x6_right/f411/rules.mk
+++ b/keyboards/handwired/tractyl_manuform/5x6_right/f411/rules.mk
@@ -1,4 +1,2 @@
 KEYBOARD_SHARED_EP = yes
 MOUSE_SHARED_EP    = yes
-
-SERIAL_DRIVER = usart
diff --git a/keyboards/input_club/ergodox_infinity/keyboard.json b/keyboards/input_club/ergodox_infinity/keyboard.json
index fd89806b00..75778c3288 100644
--- a/keyboards/input_club/ergodox_infinity/keyboard.json
+++ b/keyboards/input_club/ergodox_infinity/keyboard.json
@@ -39,7 +39,10 @@
     },
     "diode_direction": "ROW2COL",
     "split": {
-        "enabled": true
+        "enabled": true,
+        "serial": {
+            "driver": "usart"
+        }
     },
     "processor": "MK20DX256",
     "bootloader": "kiibohd",
diff --git a/keyboards/input_club/ergodox_infinity/rules.mk b/keyboards/input_club/ergodox_infinity/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/input_club/ergodox_infinity/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/janus/keyboard.json b/keyboards/janus/keyboard.json
index 29000b9ef2..8c4f522b86 100644
--- a/keyboards/janus/keyboard.json
+++ b/keyboards/janus/keyboard.json
@@ -25,7 +25,10 @@
         "nkro": true
     },
     "split": {
-        "enabled": true
+        "enabled": true,
+        "serial": {
+            "driver": "usart"
+        }
     },
     "community_layouts": [
         "split_3x5_2"
diff --git a/keyboards/janus/rules.mk b/keyboards/janus/rules.mk
deleted file mode 100644
index 59b74ac86b..0000000000
--- a/keyboards/janus/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
\ No newline at end of file
diff --git a/keyboards/jaykeeb/kamigakushi/rules.mk b/keyboards/jaykeeb/kamigakushi/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/jaykeeb/kamigakushi/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/junco/rev1/keyboard.json b/keyboards/junco/rev1/keyboard.json
index 855628d3b1..936a0bf29c 100644
--- a/keyboards/junco/rev1/keyboard.json
+++ b/keyboards/junco/rev1/keyboard.json
@@ -39,6 +39,9 @@
                     {"pin_a": "GP16", "pin_b": "GP17"}
                 ]
             }
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "processor": "RP2040",
diff --git a/keyboards/junco/rev1/rules.mk b/keyboards/junco/rev1/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/junco/rev1/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/kaly/kaly42/keyboard.json b/keyboards/kaly/kaly42/keyboard.json
index 38de4ccea5..3115d051df 100644
--- a/keyboards/kaly/kaly42/keyboard.json
+++ b/keyboards/kaly/kaly42/keyboard.json
@@ -33,6 +33,9 @@
                     ["A0", "A1", "A2", "NO_PIN", "NO_PIN", "NO_PIN"]
                 ]
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "url": "https://github.com/Dwctor/Kaly",
diff --git a/keyboards/kaly/kaly42/rules.mk b/keyboards/kaly/kaly42/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/kaly/kaly42/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/karn/keyboard.json b/keyboards/karn/keyboard.json
index b088f61425..1ddd8e5a98 100644
--- a/keyboards/karn/keyboard.json
+++ b/keyboards/karn/keyboard.json
@@ -21,7 +21,10 @@
         "matrix": [0, 1]
     },
     "split": {
-        "enabled": true
+        "enabled": true,
+        "serial": {
+            "driver": "usart"
+        }
     },
     "layouts": {
         "LAYOUT": {
diff --git a/keyboards/karn/rules.mk b/keyboards/karn/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/karn/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/keebio/cepstrum/rev1/keyboard.json b/keyboards/keebio/cepstrum/rev1/keyboard.json
index 0b53d12792..27756784bc 100644
--- a/keyboards/keebio/cepstrum/rev1/keyboard.json
+++ b/keyboards/keebio/cepstrum/rev1/keyboard.json
@@ -15,6 +15,9 @@
                 "rows": ["GP2", "GP3", "GP5", "GP8", "GP19"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/keebio/cepstrum/rev1/rules.mk b/keyboards/keebio/cepstrum/rev1/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/cepstrum/rev1/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/chiri_ce/rev1/keyboard.json b/keyboards/keebio/chiri_ce/rev1/keyboard.json
index 8b46dd7d6d..f118a4dd1e 100644
--- a/keyboards/keebio/chiri_ce/rev1/keyboard.json
+++ b/keyboards/keebio/chiri_ce/rev1/keyboard.json
@@ -124,6 +124,9 @@
                 "rows": ["GP24", "GP23", "GP21", "GP3"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync_matrix_state": true
         }
diff --git a/keyboards/keebio/chiri_ce/rev1/rules.mk b/keyboards/keebio/chiri_ce/rev1/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/chiri_ce/rev1/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/iris/rev8/keyboard.json b/keyboards/keebio/iris/rev8/keyboard.json
index 85676067c0..07f9df260a 100644
--- a/keyboards/keebio/iris/rev8/keyboard.json
+++ b/keyboards/keebio/iris/rev8/keyboard.json
@@ -30,6 +30,9 @@
                 "rows": ["GP22", "GP19", "GP18", "GP17", "GP7"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync" :{
                 "matrix_state": true
diff --git a/keyboards/keebio/iris/rev8/rules.mk b/keyboards/keebio/iris/rev8/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/iris/rev8/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/iris_ce/rev1/keyboard.json b/keyboards/keebio/iris_ce/rev1/keyboard.json
index 6086f948b1..1f131e51bd 100644
--- a/keyboards/keebio/iris_ce/rev1/keyboard.json
+++ b/keyboards/keebio/iris_ce/rev1/keyboard.json
@@ -141,6 +141,9 @@
                 "rows": ["GP26", "GP24", "GP23", "GP21", "GP3"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync_matrix_state": true
         }
diff --git a/keyboards/keebio/iris_ce/rev1/rules.mk b/keyboards/keebio/iris_ce/rev1/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/iris_ce/rev1/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/irispad/rev8/rules.mk b/keyboards/keebio/irispad/rev8/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/irispad/rev8/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/nyquist/rev4/keyboard.json b/keyboards/keebio/nyquist/rev4/keyboard.json
index 804d1aa5d4..ada4824b1c 100644
--- a/keyboards/keebio/nyquist/rev4/keyboard.json
+++ b/keyboards/keebio/nyquist/rev4/keyboard.json
@@ -27,6 +27,9 @@
                 "rows": ["GP24", "GP17", "GP15", "GP14", "GP12"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync" :{
                 "matrix_state": true
diff --git a/keyboards/keebio/nyquist/rev4/rules.mk b/keyboards/keebio/nyquist/rev4/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/nyquist/rev4/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/nyquist/rev5/keyboard.json b/keyboards/keebio/nyquist/rev5/keyboard.json
index 83d88b37b8..fc03c00e29 100644
--- a/keyboards/keebio/nyquist/rev5/keyboard.json
+++ b/keyboards/keebio/nyquist/rev5/keyboard.json
@@ -31,6 +31,9 @@
                 "rows": ["GP24", "GP17", "GP15", "GP14", "GP12"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync" :{
                 "matrix_state": true
diff --git a/keyboards/keebio/nyquist/rev5/rules.mk b/keyboards/keebio/nyquist/rev5/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/nyquist/rev5/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/sinc/rev3/keyboard.json b/keyboards/keebio/sinc/rev3/keyboard.json
index da828dbb35..81b5e1c4c0 100644
--- a/keyboards/keebio/sinc/rev3/keyboard.json
+++ b/keyboards/keebio/sinc/rev3/keyboard.json
@@ -26,6 +26,9 @@
                 "rows": ["GP16", "GP19", "GP17", "GP9", "GP8", "GP26"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/keebio/sinc/rev3/rules.mk b/keyboards/keebio/sinc/rev3/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/sinc/rev3/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keebio/sinc/rev4/keyboard.json b/keyboards/keebio/sinc/rev4/keyboard.json
index 15b28fb012..bfbceef02e 100644
--- a/keyboards/keebio/sinc/rev4/keyboard.json
+++ b/keyboards/keebio/sinc/rev4/keyboard.json
@@ -26,6 +26,9 @@
                 "rows": ["GP16", "GP19", "GP17", "GP9", "GP8", "GP26"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/keebio/sinc/rev4/rules.mk b/keyboards/keebio/sinc/rev4/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/sinc/rev4/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/keycapsss/3w6_2040/keyboard.json b/keyboards/keycapsss/3w6_2040/keyboard.json
index 88bc275a69..f29b3753c6 100644
--- a/keyboards/keycapsss/3w6_2040/keyboard.json
+++ b/keyboards/keycapsss/3w6_2040/keyboard.json
@@ -50,6 +50,9 @@
     },
     "split": {
         "enabled": true,
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "indicators": true,
diff --git a/keyboards/keycapsss/3w6_2040/rules.mk b/keyboards/keycapsss/3w6_2040/rules.mk
index 7b11b23005..0cac88f7f7 100644
--- a/keyboards/keycapsss/3w6_2040/rules.mk
+++ b/keyboards/keycapsss/3w6_2040/rules.mk
@@ -1,2 +1 @@
-SERIAL_DRIVER = vendor
 POINTING_DEVICE_DRIVER = pimoroni_trackball
diff --git a/keyboards/keychron/q11/ansi_encoder/rules.mk b/keyboards/keychron/q11/ansi_encoder/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/keychron/q11/ansi_encoder/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/keychron/q11/info.json b/keyboards/keychron/q11/info.json
index 51a8e5937e..62d1119ebd 100755
--- a/keyboards/keychron/q11/info.json
+++ b/keyboards/keychron/q11/info.json
@@ -53,6 +53,9 @@
                 "rows": ["B5", "B4", "B3", "A15", "A14", "A13"]
             }
         },
+        "serial": {
+            "driver": "usart"
+        },
         "transport": {
             "sync" :{
                 "matrix_state": true
diff --git a/keyboards/keychron/q11/iso_encoder/rules.mk b/keyboards/keychron/q11/iso_encoder/rules.mk
deleted file mode 100755
index c6e2988321..0000000000
--- a/keyboards/keychron/q11/iso_encoder/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/meetlab/kafkasplit/keyboard.json b/keyboards/meetlab/kafkasplit/keyboard.json
index d71d405f33..375d4f7a03 100644
--- a/keyboards/meetlab/kafkasplit/keyboard.json
+++ b/keyboards/meetlab/kafkasplit/keyboard.json
@@ -130,6 +130,9 @@
                 "rows": ["GP11", "GP13", "GP12", "GP14"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "indicators": true,
diff --git a/keyboards/meetlab/kafkasplit/rules.mk b/keyboards/meetlab/kafkasplit/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/meetlab/kafkasplit/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/mlego/m60_split/rev1/keyboard.json b/keyboards/mlego/m60_split/rev1/keyboard.json
index d0c6275dc9..b4753a1d9e 100644
--- a/keyboards/mlego/m60_split/rev1/keyboard.json
+++ b/keyboards/mlego/m60_split/rev1/keyboard.json
@@ -69,6 +69,9 @@
                 "rows": ["B1", "A4", "A5", "A6", "A7"]
             }
         },
+        "serial": {
+            "driver": "usart"
+        },
         "transport": {
             "sync": {
                 "indicators": true,
diff --git a/keyboards/mlego/m60_split/rev1/rules.mk b/keyboards/mlego/m60_split/rev1/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/mlego/m60_split/rev1/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/mlego/m60_split/rev2/keyboard.json b/keyboards/mlego/m60_split/rev2/keyboard.json
index 48d962f9cc..08dcd19573 100644
--- a/keyboards/mlego/m60_split/rev2/keyboard.json
+++ b/keyboards/mlego/m60_split/rev2/keyboard.json
@@ -62,6 +62,9 @@
                 "rows": ["B1", "A4", "A5", "A6", "A7"]
             }
         },
+        "serial": {
+            "driver": "usart"
+        },
         "transport": {
             "sync": {
                 "indicators": true,
diff --git a/keyboards/mlego/m60_split/rev2/rules.mk b/keyboards/mlego/m60_split/rev2/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/mlego/m60_split/rev2/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/phoenix/keyboard.json b/keyboards/phoenix/keyboard.json
index 51be9790fb..405b0ffd0a 100644
--- a/keyboards/phoenix/keyboard.json
+++ b/keyboards/phoenix/keyboard.json
@@ -30,7 +30,10 @@
     "diode_direction": "ROW2COL",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "A9"
+        "soft_serial_pin": "A9",
+        "serial": {
+            "driver": "usart"
+        }
     },
     "processor": "STM32F401",
     "bootloader": "stm32-dfu",
diff --git a/keyboards/phoenix/rules.mk b/keyboards/phoenix/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/phoenix/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/pica40/rev2/keyboard.json b/keyboards/pica40/rev2/keyboard.json
index 630d6da467..f4cc4c2697 100644
--- a/keyboards/pica40/rev2/keyboard.json
+++ b/keyboards/pica40/rev2/keyboard.json
@@ -40,6 +40,9 @@
             "right": {
                 "rotary": []
             }
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "encoder": {
diff --git a/keyboards/pica40/rev2/rules.mk b/keyboards/pica40/rev2/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/pica40/rev2/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/pmk/posey_split/v4/keyboard.json b/keyboards/pmk/posey_split/v4/keyboard.json
index 016c4d7122..e27991783d 100644
--- a/keyboards/pmk/posey_split/v4/keyboard.json
+++ b/keyboards/pmk/posey_split/v4/keyboard.json
@@ -42,6 +42,9 @@
         "enabled": true,
         "handedness": {
             "pin": "GP18"
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "tags": ["split"],
diff --git a/keyboards/pmk/posey_split/v4/rules.mk b/keyboards/pmk/posey_split/v4/rules.mk
deleted file mode 100644
index 743228e94b..0000000000
--- a/keyboards/pmk/posey_split/v4/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
\ No newline at end of file
diff --git a/keyboards/pmk/posey_split/v5/keyboard.json b/keyboards/pmk/posey_split/v5/keyboard.json
index 9ef7d0af02..02c04dbba2 100644
--- a/keyboards/pmk/posey_split/v5/keyboard.json
+++ b/keyboards/pmk/posey_split/v5/keyboard.json
@@ -42,6 +42,9 @@
         "enabled": true,
         "handedness": {
             "pin": "GP18"
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "tags": ["split"],
diff --git a/keyboards/pmk/posey_split/v5/rules.mk b/keyboards/pmk/posey_split/v5/rules.mk
deleted file mode 100644
index 743228e94b..0000000000
--- a/keyboards/pmk/posey_split/v5/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
\ No newline at end of file
diff --git a/keyboards/pmk/recore/v3/keyboard.json b/keyboards/pmk/recore/v3/keyboard.json
index 6bc095daa5..f21708adc5 100644
--- a/keyboards/pmk/recore/v3/keyboard.json
+++ b/keyboards/pmk/recore/v3/keyboard.json
@@ -40,6 +40,9 @@
         "enabled": true,
         "handedness": {
             "pin": "GP18"
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "tags": ["ortho", "split"],
diff --git a/keyboards/pmk/recore/v3/rules.mk b/keyboards/pmk/recore/v3/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/pmk/recore/v3/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/quokka/keyboard.json b/keyboards/quokka/keyboard.json
index 094e3e496e..a92a113f3e 100644
--- a/keyboards/quokka/keyboard.json
+++ b/keyboards/quokka/keyboard.json
@@ -66,7 +66,10 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "GP0"
+        "soft_serial_pin": "GP0",
+        "serial": {
+            "driver": "vendor"
+        }
     },
     "url": "https://github.com/dlford/quokka",
     "usb": {
diff --git a/keyboards/quokka/rules.mk b/keyboards/quokka/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/quokka/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/redox/rev1/proton_c/keyboard.json b/keyboards/redox/rev1/proton_c/keyboard.json
index 48bec82627..9554630375 100644
--- a/keyboards/redox/rev1/proton_c/keyboard.json
+++ b/keyboards/redox/rev1/proton_c/keyboard.json
@@ -2,6 +2,11 @@
     "usb": {
         "device_version": "1.0.1"
     },
+    "split": {
+        "serial": {
+            "driver": "usart"
+        }
+    },
     "ws2812": {
         "pin": "A9"
     },
diff --git a/keyboards/redox/rev1/proton_c/rules.mk b/keyboards/redox/rev1/proton_c/rules.mk
deleted file mode 100644
index d45b778a1a..0000000000
--- a/keyboards/redox/rev1/proton_c/rules.mk
+++ /dev/null
@@ -1,2 +0,0 @@
-# specific to using the serial serial driver
-SERIAL_DRIVER = usart
diff --git a/keyboards/rgbkb/mun/rev1/keyboard.json b/keyboards/rgbkb/mun/rev1/keyboard.json
index cf988d8f95..7eae34c18f 100644
--- a/keyboards/rgbkb/mun/rev1/keyboard.json
+++ b/keyboards/rgbkb/mun/rev1/keyboard.json
@@ -122,6 +122,9 @@
                 "layer_state": true,
                 "matrix_state": true
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "processor": "STM32F303",
diff --git a/keyboards/rgbkb/mun/rev1/rules.mk b/keyboards/rgbkb/mun/rev1/rules.mk
index dad85ac483..da4bbf0a63 100644
--- a/keyboards/rgbkb/mun/rev1/rules.mk
+++ b/keyboards/rgbkb/mun/rev1/rules.mk
@@ -4,5 +4,4 @@ SRC += touch_encoder.c
 SRC += common_oled.c
 I2C_DRIVER_REQUIRED = yes
 
-SERIAL_DRIVER = usart
 OPT = 3
diff --git a/keyboards/rgbkb/sol3/rev1/keyboard.json b/keyboards/rgbkb/sol3/rev1/keyboard.json
index 54e57e3f8f..2ff3b03b0a 100644
--- a/keyboards/rgbkb/sol3/rev1/keyboard.json
+++ b/keyboards/rgbkb/sol3/rev1/keyboard.json
@@ -146,6 +146,9 @@
                 "rows": ["B15", "B14", "A8", "A13", "A7", null]
             }
         },
+        "serial": {
+            "driver": "usart"
+        },
         "transport": {
             "sync": {
                 "indicators": true,
diff --git a/keyboards/rgbkb/sol3/rev1/rules.mk b/keyboards/rgbkb/sol3/rev1/rules.mk
index dad85ac483..da4bbf0a63 100644
--- a/keyboards/rgbkb/sol3/rev1/rules.mk
+++ b/keyboards/rgbkb/sol3/rev1/rules.mk
@@ -4,5 +4,4 @@ SRC += touch_encoder.c
 SRC += common_oled.c
 I2C_DRIVER_REQUIRED = yes
 
-SERIAL_DRIVER = usart
 OPT = 3
diff --git a/keyboards/spleeb/keyboard.json b/keyboards/spleeb/keyboard.json
index 7b92316de2..4d137ef10d 100644
--- a/keyboards/spleeb/keyboard.json
+++ b/keyboards/spleeb/keyboard.json
@@ -43,6 +43,9 @@
                 "layer_state": true,
                 "modifiers": true
             }
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "url": "https://github.com/chrishoage/spleeb",
diff --git a/keyboards/spleeb/rules.mk b/keyboards/spleeb/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/spleeb/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/splitkb/kyria/rev1/proton_c/keyboard.json b/keyboards/splitkb/kyria/rev1/proton_c/keyboard.json
index a7181fef8d..e1308bb9ec 100644
--- a/keyboards/splitkb/kyria/rev1/proton_c/keyboard.json
+++ b/keyboards/splitkb/kyria/rev1/proton_c/keyboard.json
@@ -17,6 +17,9 @@
                     {"pin_a": "B0", "pin_b": "B4"}
                 ]
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "ws2812": {
diff --git a/keyboards/splitkb/kyria/rev1/proton_c/rules.mk b/keyboards/splitkb/kyria/rev1/proton_c/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/splitkb/kyria/rev1/proton_c/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/splitkb/kyria/rev2/proton_c/keyboard.json b/keyboards/splitkb/kyria/rev2/proton_c/keyboard.json
index 43a3d532f2..94cb7993d2 100644
--- a/keyboards/splitkb/kyria/rev2/proton_c/keyboard.json
+++ b/keyboards/splitkb/kyria/rev2/proton_c/keyboard.json
@@ -26,6 +26,9 @@
                 "cols": ["B1", "B0", "B9", "B15", "B14", "B13", "B8", "A0"],
                 "rows": ["B5", "B4", "B3", "B2"]
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "ws2812": {
diff --git a/keyboards/splitkb/kyria/rev2/proton_c/rules.mk b/keyboards/splitkb/kyria/rev2/proton_c/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/splitkb/kyria/rev2/proton_c/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/stront/keyboard.json b/keyboards/stront/keyboard.json
index 5055a4fb30..573730a12b 100644
--- a/keyboards/stront/keyboard.json
+++ b/keyboards/stront/keyboard.json
@@ -68,6 +68,9 @@
                 "matrix_state": true,
                 "modifiers": true
             }
+        },
+        "serial": {
+            "driver": "vendor"
         }
     },
     "encoder": {
diff --git a/keyboards/stront/rules.mk b/keyboards/stront/rules.mk
index 61d59017cb..5c88bf132a 100644
--- a/keyboards/stront/rules.mk
+++ b/keyboards/stront/rules.mk
@@ -1,5 +1,3 @@
-SERIAL_DRIVER = vendor
-
 POINTING_DEVICE_DRIVER = cirque_pinnacle_spi
 
 QUANTUM_PAINTER_DRIVERS += st7789_spi
diff --git a/keyboards/supersplit/rules.mk b/keyboards/supersplit/rules.mk
deleted file mode 100644
index a4f16a0b6b..0000000000
--- a/keyboards/supersplit/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = bitbang
diff --git a/keyboards/tkw/grandiceps/info.json b/keyboards/tkw/grandiceps/info.json
index 13bc1e7acf..c2a198835f 100644
--- a/keyboards/tkw/grandiceps/info.json
+++ b/keyboards/tkw/grandiceps/info.json
@@ -58,6 +58,9 @@
                 "cols": ["B0", "A7", "A3", "A5", "A4", "A2"],
                 "rows": ["B12", "A6", "B13", "B9", "B8"]
             }
+        },
+        "serial": {
+            "driver": "usart"
         }
     },
     "qmk": {
diff --git a/keyboards/tkw/grandiceps/rules.mk b/keyboards/tkw/grandiceps/rules.mk
index 01fa521763..ab8aeff268 100644
--- a/keyboards/tkw/grandiceps/rules.mk
+++ b/keyboards/tkw/grandiceps/rules.mk
@@ -1,3 +1 @@
-SERIAL_DRIVER = usart
-
 DEFAULT_FOLDER = tkw/grandiceps/rev1
diff --git a/keyboards/tweetydabird/lotus58/rp2040_ce/keyboard.json b/keyboards/tweetydabird/lotus58/rp2040_ce/keyboard.json
index c8bf711747..24f27c276a 100644
--- a/keyboards/tweetydabird/lotus58/rp2040_ce/keyboard.json
+++ b/keyboards/tweetydabird/lotus58/rp2040_ce/keyboard.json
@@ -17,6 +17,9 @@
                 ]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "soft_serial_pin": "GP1",
         "handedness": {
             "pin": "GP9"
diff --git a/keyboards/tweetydabird/lotus58/rp2040_ce/rules.mk b/keyboards/tweetydabird/lotus58/rp2040_ce/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/tweetydabird/lotus58/rp2040_ce/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/tzarc/djinn/info.json b/keyboards/tzarc/djinn/info.json
index b173a18de1..8f0c0bc75f 100644
--- a/keyboards/tzarc/djinn/info.json
+++ b/keyboards/tzarc/djinn/info.json
@@ -54,6 +54,9 @@
         ]
       }
     },
+    "serial": {
+      "driver": "usart"
+    },
     "transport": {
       "sync": {
           "activity": true,
diff --git a/keyboards/tzarc/djinn/rules.mk b/keyboards/tzarc/djinn/rules.mk
index 78912d16d0..d5060d9814 100644
--- a/keyboards/tzarc/djinn/rules.mk
+++ b/keyboards/tzarc/djinn/rules.mk
@@ -1,7 +1,5 @@
 CUSTOM_MATRIX = lite
 
-SERIAL_DRIVER = usart
-
 CIE1931_CURVE = yes
 
 QUANTUM_PAINTER_DRIVERS = ili9341_spi
diff --git a/keyboards/yoichiro/lunakey_pico/keyboard.json b/keyboards/yoichiro/lunakey_pico/keyboard.json
index d80aaf0612..39070d615a 100644
--- a/keyboards/yoichiro/lunakey_pico/keyboard.json
+++ b/keyboards/yoichiro/lunakey_pico/keyboard.json
@@ -47,7 +47,10 @@
         "max_brightness": 255
     },
     "split": {
-        "enabled": true
+        "enabled": true,
+        "serial": {
+            "driver": "vendor"
+        }
     },
     "ws2812": {
         "pin": "GP6",
diff --git a/keyboards/yoichiro/lunakey_pico/rules.mk b/keyboards/yoichiro/lunakey_pico/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/yoichiro/lunakey_pico/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/ziptyze/lets_split_v3/keyboard.json b/keyboards/ziptyze/lets_split_v3/keyboard.json
index 3db8004756..ca53b42240 100644
--- a/keyboards/ziptyze/lets_split_v3/keyboard.json
+++ b/keyboards/ziptyze/lets_split_v3/keyboard.json
@@ -22,6 +22,9 @@
         "vid": "0x6F75"
     },
     "split": {
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/ziptyze/lets_split_v3/rules.mk b/keyboards/ziptyze/lets_split_v3/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/ziptyze/lets_split_v3/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor
diff --git a/keyboards/zvecr/split_blackpill/keyboard.json b/keyboards/zvecr/split_blackpill/keyboard.json
index 71eb99b7d4..f5bc458d73 100644
--- a/keyboards/zvecr/split_blackpill/keyboard.json
+++ b/keyboards/zvecr/split_blackpill/keyboard.json
@@ -26,6 +26,9 @@
         "handedness": {
             "pin": "B3"
         },
+        "serial": {
+            "driver": "usart"
+        },
         "soft_serial_pin": "B6",
         "bootmagic": {
             "matrix": [4, 0]
diff --git a/keyboards/zvecr/split_blackpill/rules.mk b/keyboards/zvecr/split_blackpill/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/zvecr/split_blackpill/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/zvecr/zv48/f401/rules.mk b/keyboards/zvecr/zv48/f401/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/zvecr/zv48/f401/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/zvecr/zv48/f411/rules.mk b/keyboards/zvecr/zv48/f411/rules.mk
deleted file mode 100644
index c6e2988321..0000000000
--- a/keyboards/zvecr/zv48/f411/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = usart
diff --git a/keyboards/zvecr/zv48/info.json b/keyboards/zvecr/zv48/info.json
index e596eb6e79..6e4daad312 100644
--- a/keyboards/zvecr/zv48/info.json
+++ b/keyboards/zvecr/zv48/info.json
@@ -57,6 +57,9 @@
         "bootmagic": {
             "matrix": [4, 0]
         },
+        "serial": {
+            "driver": "usart"
+        },
         "matrix_pins": {
             "right": {
                 "cols": ["B10", "B15", "A10", "A15", "B3", "B4"],