Fix serial speed DD configuration & migrate keyboards (#25546)

* Fix serial speed DD configuration

- Fixes incorrect SOFT_SERIAL_SPEED mapping
- Renames key split.soft_serial_speed -> split.serial.speed
- Migrates keyoards that configure this, and remove configuration from keyboards that do not differ from the default behaviour
- Add deprecation notice and migration support

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/python/qmk/info.py b/lib/python/qmk/info.py
index b4fa481b1b..f63228b2bc 100644
--- a/lib/python/qmk/info.py
+++ b/lib/python/qmk/info.py
@@ -477,6 +477,9 @@ def _extract_split_serial(info_data, config_c):
     if 'soft_serial_pin' in split:
         split['serial'] = split.get('serial', {})
         split['serial']['pin'] = split.pop('soft_serial_pin')
+    if 'soft_serial_speed' in split:
+        split['serial'] = split.get('serial', {})
+        split['serial']['speed'] = split.pop('soft_serial_speed')
 
 
 def _extract_split_transport(info_data, config_c):