| Message ID | 20170717212811.25374-2-enric.balletbo@collabora.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon 2017-07-17 23:28:08, Enric Balletbo i Serra wrote: > Hardware needs a delay between setting an initial (non-zero) PWM and > enabling the backlight using GPIO. The post-pwm-on-delay-us specifies > this delay in micro seconds. Hardware also needs a delay between disabing > the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-us > is this delay in micro seconds. > > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Acked-by: Pavel Machek <pavel@ucw.cz>
diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index 764db86..810527c 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-us: Delay in us between setting an initial (non-zero) PWM + and enabling the backlight using GPIO. + - pwm-off-delay-us: Delay in us 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-us = <10000>; + pwm-off-delay-us = <10000>; };
Hardware needs a delay between setting an initial (non-zero) PWM and enabling the backlight using GPIO. The post-pwm-on-delay-us specifies this delay in micro seconds. Hardware also needs a delay between disabing the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-us is this delay in micro seconds. Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> --- Based on the original Huang Lin <hl@rock-chips.com> work. Changes since v2: - Use separate properties (Rob Herring) Changes since v1: - As suggested by Daniel Thompson - Do not assume power-on delay and power-off delay will be the same Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 ++++++ 1 file changed, 6 insertions(+)