| Message ID | 20231116105319.957600-2-f.suligoi@asem.it (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | backlight: mp3309c: Add support for MPS MP3309C | expand |
On Thu, Nov 16, 2023 at 11:53:18AM +0100, 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 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> Daniel.
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>; }; };
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> --- v7: - add missed patch history - add missed "Acked-by" added in one of the previous version v6: - check and resend for updated kernel 6.7.0-rc1 (nothing changed compared to the previous versions) - add this patch to the same patchset of the MP3309C device driver Note: the patch related to this file was previously a separate patch and sent in two versions (v1 and v2). It has now been included in this patchset, starting with the version v6. v5...v3: - non-existing versions (the last was v2, the next is v6) v2: - add more explanations in commit message, about the the non-existence of compatibility issues with the previous versions of the yaml file v1: - first version .../bindings/leds/backlight/mps,mp3309c.yaml | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)