From ac7bfb27729fbfe85b93b083cba7898a1c9a9d91 Mon Sep 17 00:00:00 2001 From: Enric Balletbo i Serra Date: Wed, 28 Mar 2018 19:03:24 +0200 Subject: dt-bindings: pwm-backlight: Add PWM delay proprieties. Hardware needs a delay between setting an initial (non-zero) PWM and enabling the backlight using GPIO. The post-pwm-on-delay-ms specifies this delay in milli seconds. Hardware also needs a delay between disabing the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-ms is this delay in milli seconds. Signed-off-by: Enric Balletbo i Serra Acked-by: Pavel Machek Acked-by: Thierry Reding Acked-by: Daniel Thompson Reviewed-by: Rob Herring Signed-off-by: Lee Jones --- Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation/devicetree/bindings/leds') diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index 764db86d441a..310810906613 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt @@ -17,6 +17,10 @@ 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]) + - post-pwm-on-delay-ms: Delay in ms between setting an initial (non-zero) PWM + and enabling the backlight using GPIO. + - pwm-off-delay-ms: Delay in ms between disabling the backlight using GPIO + and setting PWM value to 0. [0]: Documentation/devicetree/bindings/pwm/pwm.txt [1]: Documentation/devicetree/bindings/gpio/gpio.txt @@ -32,4 +36,6 @@ Example: power-supply = <&vdd_bl_reg>; enable-gpios = <&gpio 58 0>; + post-pwm-on-delay-ms = <10>; + pwm-off-delay-ms = <10>; }; -- cgit v1.2.3-59-g8ed1b