diff options
| author | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2018-03-28 19:03:24 +0200 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2018-04-30 10:50:43 +0100 |
| commit | ac7bfb27729fbfe85b93b083cba7898a1c9a9d91 (patch) | |
| tree | 258ae916f7cf5f8f86b59aec081bdfa3478103d3 /Documentation/devicetree/bindings/leds | |
| parent | 5fb5caee92ba35a4a3baa61d45a78eb057e2c031 (diff) | |
dt-bindings: pwm-backlight: Add PWM delay proprieties.
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@collabora.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/leds')
| -rw-r--r-- | Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 |
1 files changed, 6 insertions, 0 deletions
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>; }; |