linux-kernel - Re: [PATCH 1/5] bindings: regulator: added support for suspend states

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Message-ID: <CAG2=9p9ahGgnz1Gos-o-o5PB9UH--2t3Lv54PaK5_f2jpNQnDQ@mail.gmail.com>
Date:   Fri, 22 Dec 2017 14:05:21 +0800
From:   Chunyan Zhang <zhang.chunyan@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH 1/5] bindings: regulator: added support for suspend states

Hi Rob,

On 22 December 2017 at 07:26, Rob Herring <robh@...nel.org> wrote:
> On Thu, Dec 21, 2017 at 02:25:02PM +0800, Chunyan Zhang wrote:
>> Documented a few new added properties which are used for supporting
>> regulator suspend states.
>
> Your commit message should answer why you need this. What problem do you
> have that this solves?
>
>>
>> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
>> ---
>>  Documentation/devicetree/bindings/regulator/regulator.txt | 11 +++++++++--
>>  1 file changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
>> index 378f6dc..618a322 100644
>> --- a/Documentation/devicetree/bindings/regulator/regulator.txt
>> +++ b/Documentation/devicetree/bindings/regulator/regulator.txt
>> @@ -42,8 +42,15 @@ Optional properties:
>>  - regulator-state-[mem/disk] node has following common properties:
>>       - regulator-on-in-suspend: regulator should be on in suspend state.
>>       - regulator-off-in-suspend: regulator should be off in suspend state.
>> -     - regulator-suspend-microvolt: regulator should be set to this voltage
>> -       in suspend.
>> +     - regulator-suspend-min-microvolt: minimum voltage may be set in
>> +       suspend state.
>> +     - regulator-suspend-max-microvolt: maximum voltage may be set in
>> +       suspend state.
>> +     - regulator-suspend-microvolt: the default voltage which regulator
>> +       should be set in suspend, this can be adjusted among
>> +       <regulator-suspend-min-microvolt, regulator-suspend-max-microvolt>
>
> Perhaps this should stay a single property with: <target> <min> <max>

Do you mean that change the property name from "regulator-suspend-microvolt" to
"regulator-suspend-target-microvolt"?

"regulator-suspend-microvolt" is the one that some SoC is using. My
intention was just to keep that configuration still working.

> Though why would you ever not try to set to the minimum voltage within
> the range of <min> to <max>?

IIUC, you mean just removing "regulator-suspend-microvolt", and use
"regulator-suspend-min-microvolt" as the default value for suspend
voltage?
I think that can work, but would it be better to not remove that right
now, since some one is using that?

Thanks for your review!

Chunyan

>
>> +     - regulator-changeable-in-suspend: whether the default voltage and
>> +       the regulator on/off in suspend can be changed in runtime.
>>       - regulator-mode: operating mode in the given suspend state.
>>         The set of possible operating modes depends on the capabilities of
>>         every hardware so the valid modes are documented on each regulator
>> --
>> 2.7.4
>>