On Sun, 26 May 2024, Thomas Weißschuh wrote: > Extend the cros_ec MFD device to also load cros_kbd_led_backlight > when the EC reports EC_FEATURE_PWM_KEYB. > As the driver can now be probed multiple times, some preparation in the > LED core is necessary to avoid name collisions. > > Patch 1 is a general cleanup for the LED core. > Patch 2 modifies the LED core to skip the default collision handling. > Patch 3 adds the new probing logic to cros_kbd_led_backlight. > Patch 4 wires up the driver to the cros_ec mfd devices. > > The helper keyboard_led_is_mfd_device is a bit iffy. > But using match data doesn't work. > > * driver_data from platform_device_id is overwritten by the mfd platform data > * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the > internals of cros_kbd_led_backlight > > Tested on a Framework 13 AMD, Firmware 3.05, and a Jinlon Chromebook. > > To: Lee Jones <lee@xxxxxxxxxx> > To: Benson Leung <bleung@xxxxxxxxxxxx> > To: Guenter Roeck <groeck@xxxxxxxxxxxx> > To: Tzung-Bi Shih <tzungbi@xxxxxxxxxx> > To: Pavel Machek <pavel@xxxxxx> > Cc: chrome-platform@xxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: Dustin Howett <dustin@xxxxxxxxxx> > Cc: Mario Limonciello <mario.limonciello@xxxxxxx> > Cc: linux-leds@xxxxxxxxxxxxxxx > Cc: Rajas Paranjpe <paranjperajas@xxxxxxxxx> > Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx> > > Changes in v3: > - Avoid probing multiple times (Confirmed by Rajas) > - Add Kconfig dependency on MFD_CROS_EC_DEV > - Link to v2: https://lore.kernel.org/r/20240511-cros_ec-kbd-led-framework-v2-0-b20c48109e46@xxxxxxxxxxxxxx > > Changes in v2: > - Fix build with CONFIG_MFD_CROS_EC_DEV=n (kernel test robot) > - Split out mfd registration into own commit (Lee) > - Simplify keyboard_led_is_mfd_device() with mfd_get_cell() > - Link to v1: https://lore.kernel.org/r/20240505-cros_ec-kbd-led-framework-v1-1-bfcca69013d2@xxxxxxxxxxxxxx > > --- > Thomas Weißschuh (4): > leds: class: warn about name collisions earlier > leds: add flag to avoid automatic renaming of led devices > platform/chrome: cros_kbd_led_backlight: allow binding through mfd device > mfd: cros_ec: Register keyboard backlight subdevice > > drivers/leds/led-class.c | 9 +++--- > drivers/mfd/cros_ec_dev.c | 9 ++++++ > drivers/platform/chrome/Kconfig | 2 +- > drivers/platform/chrome/cros_kbd_led_backlight.c | 40 ++++++++++++++++++++++-- > include/linux/leds.h | 1 + > 5 files changed, 54 insertions(+), 7 deletions(-) Looks okay. Does the platform patch need to be applied with the others? -- Lee Jones [李琼斯]
