On Mon, Mar 26, 2018 at 11:52:10AM +0200, 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-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 <enric.balle...@collabora.com> > Acked-by: Pavel Machek <pa...@ucw.cz> > Acked-by: Thierry Reding <thierry.red...@gmail.com>
Acked-by: Daniel Thompson <daniel.thomp...@linaro.org> > --- > Based on the original Huang Lin <h...@rock-chips.com> work. > Changes since v5: > - Add Acked-by: Thierry Reding <thierry.red...@gmail.com> > - CC DT mainling list (for some reason dropped at some point, my > fault) > Changes since v4: > - Rebase on top of mainline. > Changes since v3: > - Replace us for ms. > - Add Acked-by: Pavel Machek <pa...@ucw.cz> > 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(+) > > 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>; > }; > -- > 2.16.2 >
