[PATCH v6 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.
daniel.thompson at linaro.org
Mon Mar 26 08:07:08 PDT 2018
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.balletbo at collabora.com>
> Acked-by: Pavel Machek <pavel at ucw.cz>
> Acked-by: Thierry Reding <thierry.reding at gmail.com>
Acked-by: Daniel Thompson <daniel.thompson at linaro.org>
> Based on the original Huang Lin <hl at rock-chips.com> work.
> Changes since v5:
> - Add Acked-by: Thierry Reding <thierry.reding at gmail.com>
> - CC DT mainling list (for some reason dropped at some point, my
> Changes since v4:
> - Rebase on top of mainline.
> Changes since v3:
> - Replace us for ms.
> - Add Acked-by: Pavel Machek <pavel at 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)
> - enable-gpios: contains a single GPIO specifier for the GPIO which enables
> and disables the backlight (see GPIO binding)
> + - 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.
> : Documentation/devicetree/bindings/pwm/pwm.txt
> : 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>;
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