Re: [PATCH 1/2] dt-bindings: pwm-backlight: Add pwm-delay-us property
From: Pavel Machek <hidden>
Date: 2017-06-28 13:30:20
Also in:
linux-pwm, lkml
On Wed 2017-06-28 13:16:31, Enric Balletbo i Serra wrote:
From: huang lin <redacted> 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.
quoted hunk ↗ jump to hunk
Signed-off-by: huang lin <redacted> Signed-off-by: Enric Balletbo i Serra <redacted> --- Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 4 ++++ 1 file changed, 4 insertions(+)diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index 764db86..f75b08f 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt@@ -17,6 +17,9 @@ 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.
I understood it as "you set PWM and it takes a while for display to light up" but that's not correct. Changelog from second patch makes it clear. Please clarify it here, too. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html