Hi,

On Thu, Oct 03, 2019 at 10:28:11AM +0200, Jean-Jacques Hiblot wrote:
> Add DT binding for led-backlight.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> ---
>  .../bindings/leds/backlight/led-backlight.txt | 28 +++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> new file mode 100644
> index 000000000000..4c7dfbe7f67a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> @@ -0,0 +1,28 @@
> +led-backlight bindings
> +
> +This binding is used to describe a basic backlight device made of LEDs.
> +It can also be used to describe a backlight device controlled by the output of
> +a LED driver.
> +
> +Required properties:
> +  - compatible: "led-backlight"
> +  - leds: a list of LEDs
> +
> +Optional properties:
> +  - brightness-levels: Array of distinct brightness levels. The levels must be
> +                       in the range accepted by the underlying LED devices.
> +                       This is used to translate a backlight brightness level
> +                       into a LED brightness level. If it is not provided, the
> +                       identity mapping is used.
> +
> +  - default-brightness-level: The default brightness level.
> +
> +Example:
> +
> +	backlight {
> +		compatible = "led-backlight";
> +
> +		leds = <&led1>, <&led2>;
> +		brightness-levels = <0 4 8 16 32 64 128 255>;
> +		default-brightness-level = <6>;
> +	};
> -- 
> 2.17.1
> 
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