Messages in this thread Patch in this message | | | From | Flavio Suligoi <> | Subject | [PATCH v7 1/2] dt-bindings: backlight: mp3309c: remove two required properties | Date | Thu, 16 Nov 2023 11:53:18 +0100 |
| |
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(-)
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
| |