Re: [PATCH v2 1/4] dt-bindings: pwm-backlight: add pwm-delay-us property
flat view
From: Pavel Machek <hidden>
Date: 2017-06-30 11:25:23
Also in:
linux-pwm, linux-rockchip, lkml
On Fri 2017-06-30 13:21:06, Enric Balletbo i Serra wrote:
quoted hunk ↗ jump to hunk
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. Signed-off-by: huang lin <redacted> Signed-off-by: Enric Balletbo i Serra <redacted> --- Changes since v1: - As suggested by Daniel Thompson - Do not assume power-on delay and power-off delay will be the same v1: https://lkml.org/lkml/2017/6/28/219 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 764db86..49b037e 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt@@ -17,6 +17,11 @@ 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.
"Hardware needs a delay between setting an initial (non-zero) PWM and enabling the backlight using GPIO. The 1st cell specifies this delay in micro seconds. Hardware also needs a delay between disabing the backlight using GPIO and setting PWM value to 0. The 2nd cell is this delay in micro seconds." Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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