On Fri, 27 Oct 2017, Rob Herring wrote: > On Thu, Oct 26, 2017 at 02:49:46PM +0200, Lothar Waßmann wrote: > > When switching the backlight on, the LCD may need some time to adjust > > to the configured PWM duty cycle. Add a configurable delay between > > configuring the PWM and enabling the backlight regulator to account > > for this. > > > > Signed-off-by: Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx> > > --- > > .../bindings/leds/backlight/pwm-backlight.txt | 4 ++++ > > drivers/video/backlight/pwm_bl.c | 22 +++++++++++++++++++--- > > 2 files changed, 23 insertions(+), 3 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > > index 764db86..95594c3 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]) > > + - turn-on-delay-ms: delay in milliseconds between configuring the PWM > > + and switching PWM on. This may be required to eliminate > > + flicker when switching the PWM on after it has been > > + disabled. > > The subject talks about turning on the backlight regulator, but this > only talks about the PWM. >From my understanding "switching PWM on" == enabling the regulator. I don't see any disparity here. Or am I missing something? > > [0]: Documentation/devicetree/bindings/pwm/pwm.txt > > [1]: Documentation/devicetree/bindings/gpio/gpio.txt -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog
