Messages in this thread | | | Subject | Re: [PATCH 1/2] dt-bindings: pwm-backlight: Add pwm-delay-us property | From | Daniel Thompson <> | Date | Wed, 28 Jun 2017 14:16:58 +0100 |
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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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