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    Subject[PATCH v6 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.
    Date
    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>
    ---
    Based on the original Huang Lin <hl@rock-chips.com> work.
    Changes since v5:
    - Add Acked-by: Thierry Reding <thierry.reding@gmail.com>
    - CC DT mainling list (for some reason dropped at some point, my
    fault)
    Changes since v4:
    - Rebase on top of mainline.
    Changes since v3:
    - Replace us for ms.
    - Add Acked-by: Pavel Machek <pavel@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[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>;
    };
    --
    2.16.2
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