From 87f33a1b8f7e3d223fc331fe54fd8ec337dc9cb9 Mon Sep 17 00:00:00 2001 From: Flavio Suligoi Date: Thu, 16 Nov 2023 11:53:18 +0100 Subject: 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 Acked-by: Conor Dooley Reviewed-by: Daniel Thompson Link: https://lore.kernel.org/r/20231116105319.957600-2-f.suligoi@asem.it Signed-off-by: Lee Jones --- .../devicetree/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>; }; }; -- cgit