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author | Flavio Suligoi <f.suligoi@asem.it> | 2023-11-16 13:53:18 +0300 |
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committer | Lee Jones <lee@kernel.org> | 2023-11-23 17:54:18 +0300 |
commit | 87f33a1b8f7e3d223fc331fe54fd8ec337dc9cb9 (patch) | |
tree | e40eca83f70f4509ea223c7fb1476f2f685c08e5 /drivers/video/backlight/Makefile | |
parent | b85ea95d086471afb4ad062012a4d73cd328fa86 (diff) | |
download | linux-87f33a1b8f7e3d223fc331fe54fd8ec337dc9cb9.tar.xz |
dt-bindings: backlight: mp3309c: Remove two required properties
The two properties:
- max-brightness
- default brightness
are not really required, so they can be removed from the "required"
section.
The "max-brightness" is no longer used in the current version
of the driver (it was used only in the first version).
The "default-brightness", if omitted in the DT, is managed by the
device driver, using a default value. This value depends on the dimming
mode used:
- for the "analog mode", via I2C commands, this value is fixed by
hardware (=31)
- while in case of pwm mode the default used is the last value of the
brightness-levels array.
Also the brightness-levels array is not required:
- in "analog mode", via I2C commands, the brightness-level array is
fixed by hardware (0..31).;
- in pwm dimming mode, the driver uses a default array of 0..255 and
the "default-brightness" is the last one, which is "255"
NOTE: there are no compatibility problems with the previous version,
since the device driver has not yet been included in any kernel.
Only this dt-binding yaml file is already included in the current
v6.7.0-rc1 kernel version.
No developer may have used it.
Other changes:
- improve the backlight working mode description, in the "description"
section
- update the example, removing the "max-brightness" and introducing the
"brightess-levels" property
Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20231116105319.957600-2-f.suligoi@asem.it
Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'drivers/video/backlight/Makefile')
0 files changed, 0 insertions, 0 deletions