linux-kernel - Re: [RESEND PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.

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Date:   Fri, 9 Mar 2018 11:14:36 +0100
From:   Enric Balletbo Serra <eballetbo@...il.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
        Heiko Stuebner <heiko@...ech.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        linux-fbdev@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Guenter Roeck <groeck@...omium.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        kernel@...labora.com,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [RESEND PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.

Hi Rob,

oh, devicetree mailing list is not added, sorry, so cc'ing ...

2018-02-19 12:11 GMT+01:00 Daniel Thompson <daniel.thompson@...aro.org>:
> On Fri, Feb 16, 2018 at 06:40:31PM +0100, 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@...labora.com>
>> Acked-by: Pavel Machek <pavel@....cz>
>
> Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
>

Lee, I guess that after Daniel ack the only ack missing here is one
from Rob Herring?

Rob, if you have a chance to look at this I'd appreciate.

Thanks,
  Enric

>> ---
>> Based on the original Huang Lin <hl@...k-chips.com> work.
>>
>> Changes since v4:
>>  - Rebase on top of mainline.
>> Changes since v3:
>>  - Replace us for ms.
>>  - Add Acked-by: Pavel Machek <pavel@....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>;
>>       };
>> --
>> 2.15.1
>>