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SubjectRe: [PATCH 1/2] dt-bindings: pwm-backlight: Add pwm-delay-us property
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On 28/06/17 12:16, Enric Balletbo i Serra wrote:
> From: huang lin <hl@rock-chips.com>
>
> Add a pwm-delay-us property to specify the delay between setting an
> initial (non-zero) PWM value and enabling the backlight, and also the
> delay between disabling the backlight and setting PWM value to 0.
>
> Signed-off-by: huang lin <hl@rock-chips.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
> Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
> index 764db86..f75b08f 100644
> --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
> +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
> @@ -17,6 +17,9 @@ Optional properties:
> "pwms" property (see PWM binding[0])
> - enable-gpios: contains a single GPIO specifier for the GPIO which enables
> and disables the backlight (see GPIO binding[1])
> + - pwm-delay-us: delay between setting an initial (non-zero) PWM value and
> + enabling the backlight, and also the delay between disabling
> + the backlight and setting PWM value to 0.

If is safe to assume power-on delay and power-off delay will be the same?

I've only took a quick look but several backlight controllers support
asymetric power-on/off sequences...


Daniel.


>
> [0]: Documentation/devicetree/bindings/pwm/pwm.txt
> [1]: Documentation/devicetree/bindings/gpio/gpio.txt
> @@ -32,4 +35,5 @@ Example:
>
> power-supply = <&vdd_bl_reg>;
> enable-gpios = <&gpio 58 0>;
> + pwm-delay-us = <10000>;
> };
>

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