Re: [PATCH 1/2] dt-bindings: pwm-backlight: Add pwm-delay-us property
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From: Daniel Thompson <hidden>
Date: 2017-06-28 13:17:11
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linux-pwm, lkml
On 28/06/17 12:16, Enric Balletbo i Serra wrote:
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From: huang lin <redacted> 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 <redacted> Signed-off-by: Enric Balletbo i Serra <redacted> --- 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.
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[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>; };