[PATCH v5 RESEND 0/3] Apple DWI backlight driver

[Nick Chan <towinchenmi@gmail.com>]

Apple SoCs come with a 2-wire interface named DWI. On some iPhones, iPads
and iPod touches the backlight controller is connected via this interface.
This series adds a backlight driver for backlight controllers connected
this way.

Changes since v4:
- Change type to BACKLIGHT_PLATFORM since the driver does not directly
interface with the backlight controller. The actual backlight controller
can be directly controlled via i2c and is not the same on all hardware
that supports the dwi interface.
- Rename file to apple_dwi_bl.c to better match config option.
- Rename driver to apple-dwi-bl to better match config option
- Indicate that the backlight scales linearly

v4: https://lore.kernel.org/asahi/20241211113512.19009-1-towinchenmi@gmail.com/T

Changes since v3:
- $ref to common.yaml in bindings
- (and then additionalProperties is changed to unevaluatedProperties)
- Use hex everywhere in bindings example
- Use sizeof(*dwi_bl) instead of the type of the struct when doing
devm_kzalloc()
- Use devm_platform_get_and_ioremap_resource() in driver
- Fix sorting in drivers/video/backlight/Makefile
- In drivers/video/backlight/Kconfig, move config to right after
BACKLIGHT_APPLE
- Explain this driver being completely different from apple_bl

v3: https://lore.kernel.org/asahi/20241209075908.140014-1-towinchenmi@gmail.com/T

Changes since v2:
- Add missing includes in driver
- Fix file path in MAINTAINERS

v2: https://lore.kernel.org/asahi/20241207130433.30351-1-towinchenmi@gmail.com/T

Changes since v1:
- Fixed dt-bindings $id.
- Make power-domains an optional property in dt-bindings.
- Added missing error checking after devm_ioremap_resource() in
dwi_bl_probe().

v1: https://lore.kernel.org/asahi/20241206172735.4310-1-towinchenmi@gmail.com/T

Nick Chan

---
Nick Chan (3):
  dt-bindings: leds: backlight: apple,dwi-bl: Add Apple DWI backlight
  backlight: apple_dwi_bl: Add Apple DWI backlight driver
  MAINTAINERS: Add entries for Apple DWI backlight controller

 .../bindings/leds/backlight/apple,dwi-bl.yaml |  57 ++++++++
 MAINTAINERS                                   |   2 +
 drivers/video/backlight/Kconfig               |  12 ++
 drivers/video/backlight/Makefile              |   1 +
 drivers/video/backlight/apple_dwi_bl.c        | 123 ++++++++++++++++++
 5 files changed, 195 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml
 create mode 100644 drivers/video/backlight/apple_dwi_bl.c


base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
-- 
2.48.1