From: huang lin <hl@xxxxxxxxxxxxxx> 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 at rock-chips.com> Signed-off-by: Enric Balletbo i Serra <enric.balletbo at collabora.com> --- Changes since v1: - As suggested by Daniel Thompson - Do not assume power-on delay and power-off delay will be the same v1: https://lkml.org/lkml/2017/6/28/219 Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index 764db86..49b037e 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt @@ -17,6 +17,11 @@ 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. + The 1st cell is the pre-delay in micro seconds. + The 2nd cell is the post-delay in micro seconds. [0]: Documentation/devicetree/bindings/pwm/pwm.txt [1]: Documentation/devicetree/bindings/gpio/gpio.txt @@ -32,4 +37,5 @@ Example: power-supply = <&vdd_bl_reg>; enable-gpios = <&gpio 58 0>; + pwm-delay-us = <10000 10000>; }; -- 2.9.3
