# Re: \[PATCH v6 2/5\] dt-bindings: pwm-backlight: add PWM delay proprieties.

- From: Rob Herring \<robh@kernel.org\>
- Date: 2018-03-27 15:08:32 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2018/03/5244236
- Thread: https://ratatoskr.run/linux-pwm/2018/03/5243290/t.md

```text
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 <redacted>
> Acked-by: Pavel Machek <redacted>
> Acked-by: Thierry Reding <redacted>
> ---
> Based on the original Huang Lin [ref] work.
> Changes since v5:
>  - Add Acked-by: Thierry Reding [ref]
>  - 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 [ref]
> 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(+)

Reviewed-by: Rob Herring <robh@kernel.org> 
```