| Message ID | 20231025155057.886823-1-f.suligoi@asem.it |
|---|---|
| Headers | show |
| Series | dt-bindings: backlight: mp3309c: remove two required properties | expand |
On Wed, Oct 25, 2023 at 05:50:57PM +0200, Flavio Suligoi wrote: > 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 > "for-backlight-next" branch of the "backlight" kernel repository. > No developer may have used it. I'd argue Fixes: 02c4e661658f ("dt-bindings: backlight: Add MPS MP3309C") but that's up to Lee. Acked-by: Conor Dooley <conor.dooley@microchip.com> Thanks, Conor. > > 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> > --- > .../bindings/leds/backlight/mps,mp3309c.yaml | 10 ++++------ > 1 file changed, 4 insertions(+), 6 deletions(-) > > diff --git a/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml b/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml > index 4191e33626f5..527a37368ed7 100644 > --- a/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml > +++ b/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml > @@ -14,8 +14,8 @@ description: | > programmable switching frequency to optimize efficiency. > It supports two different dimming modes: > > - - analog mode, via I2C commands (default) > - - PWM controlled mode. > + - analog mode, via I2C commands, as default mode (32 dimming levels) > + - PWM controlled mode (optional) > > The datasheet is available at: > https://www.monolithicpower.com/en/mp3309c.html > @@ -50,8 +50,6 @@ properties: > required: > - compatible > - reg > - - max-brightness > - - default-brightness > > unevaluatedProperties: false > > @@ -66,8 +64,8 @@ examples: > compatible = "mps,mp3309c"; > reg = <0x17>; > pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */ > - max-brightness = <100>; > - default-brightness = <80>; > + brightness-levels = <0 4 8 16 32 64 128 255>; > + default-brightness = <6>; > mps,overvoltage-protection-microvolt = <24000000>; > }; > }; > -- > 2.34.1 >
This patch remove the following two not-required properties from the "required" section: - max-brightness - default brightness These properties 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 "for-backlight-next" branch of the "backlight" kernel repository. No developer may have used it. Other changes: - improve the backlight working mode descripion in the "description" section - update the example, removing the "max-brightness" and introducing the "brightess-levels" property NOTE: the "brightess-levels" property is present in the last version of the common.yaml file, so it is not decalared here. For this last version of common.yaml file, see my patch: [1/1] dt-bindings: backlight: add brightness-levels related common properties commit: d5272d39995f4150062a67e6f2cef556edece740 Flavio Suligoi (1): dt-bindings: backlight: mp3309c: remove two required properties .../bindings/leds/backlight/mps,mp3309c.yaml | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)