linux-kernel - Re: [PATCH 1/2] regulator: pwm: DT: Add ramp delay for exponential voltage transition

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Date:   Tue, 15 Nov 2016 17:12:47 +0530
From:   Laxman Dewangan <ldewangan@...dia.com>
To:     Rob Herring <robh@...nel.org>
CC:     <broonie@...nel.org>, <mark.rutland@....com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        "Douglas Anderson" <dianders@...omium.org>,
        Aleksandr Frid <afrid@...dia.com>
Subject: Re: [PATCH 1/2] regulator: pwm: DT: Add ramp delay for exponential
 voltage transition


On Monday 14 November 2016 09:18 PM, Rob Herring wrote:
> On Fri, Nov 04, 2016 at 11:07:54PM +0530, Laxman Dewangan wrote:
>> Some PWM regulator has the exponential transition in voltage change as
>> opposite to fixed slew-rate linear transition on other regulators.
>> For such PWM regulators, add the property for providing the delay
>> from DT node.
>>
>> Add DT binding details of the new property
>> "pwm-regulator-voltage-ramp-time-us" added for providing voltage
>> transition delay.
>>
>> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
>> CC: Douglas Anderson <dianders@...omium.org>
>> CC: Aleksandr Frid <afrid@...dia.com>
>>
>> ---
>> This patch is continuation of discussion on patch
>> 	regulator: pwm: Fix regulator ramp delay for continuous mode
>> https://patchwork.kernel.org/patch/9216857/
>> where is it discussed to have separate property for PWM which has
>> exponential voltage transition.
>> ---
>>   Documentation/devicetree/bindings/regulator/pwm-regulator.txt | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
>> index 3aeba9f..a163f42 100644
>> --- a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
>> +++ b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
>> @@ -54,6 +54,16 @@ Optional properties:
>>   --------------------
>>   - enable-gpios:		GPIO to use to enable/disable the regulator
>>   
>> +- pwm-regulator-voltage-ramp-time-us: Integer, voltage ramp time in
> This is a really long name. Drop the 'pwm-regulator-' part as it is
> redundant. The fact that it is PWM reg specific is captured as it is
> documented that way.
>

We already have the regulator-ramp-delay from the regulator core.
Just wanted to make this (pwm-regulator-voltage-ramp-time-us) for pwm 
specific.

Can we have "pwm-regulator-ramp-delay" or "pwm-regulator-settling-time-us"?