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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>
This commit is contained in:
Enric Balletbo i Serra 2018-03-28 19:03:24 +02:00 committed by Lee Jones
parent 5fb5caee92
commit ac7bfb2772
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
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@ -17,6 +17,10 @@ Optional properties:
"pwms" property (see PWM binding[0]) "pwms" property (see PWM binding[0])
- enable-gpios: contains a single GPIO specifier for the GPIO which enables - enable-gpios: contains a single GPIO specifier for the GPIO which enables
and disables the backlight (see GPIO binding[1]) 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 [0]: Documentation/devicetree/bindings/pwm/pwm.txt
[1]: Documentation/devicetree/bindings/gpio/gpio.txt [1]: Documentation/devicetree/bindings/gpio/gpio.txt
@ -32,4 +36,6 @@ Example:
power-supply = <&vdd_bl_reg>; power-supply = <&vdd_bl_reg>;
enable-gpios = <&gpio 58 0>; enable-gpios = <&gpio 58 0>;
post-pwm-on-delay-ms = <10>;
pwm-off-delay-ms = <10>;
}; };