linux-kernel - Re: [PATCH v3 1/5] bindings: regulator: added support for suspend states

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Date:   Mon, 22 Jan 2018 10:16:05 +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, Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH v3 1/5] bindings: regulator: added support for suspend states

On 20 January 2018 at 06:11, Rob Herring <robh@...nel.org> wrote:
> On Fri, Jan 12, 2018 at 06:18:21PM +0800, Chunyan Zhang wrote:
>> Some systems need to set regulators to specific states when they enter
>> low power modes, especially around CPUs. There are many of these modes
>> depending on the particular runtime state.
>>
>> Currently the regulator consumers are not granted permission to change
>> suspend state of regulator devices, the constraints are configured at
>> startup.  In order to allow changes in a vlotage range, we need to add
>> new properties for voltage range and a flag to give permission to
>> change the suspend voltage and suspend on/off in suspend mode.
>>
>> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
>> ---
>>  Documentation/devicetree/bindings/regulator/regulator.txt | 15 +++++++++++++--
>>  1 file changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
>> index 378f6dc..532e286 100644
>> --- a/Documentation/devicetree/bindings/regulator/regulator.txt
>> +++ b/Documentation/devicetree/bindings/regulator/regulator.txt
>> @@ -42,8 +42,19 @@ 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
>> +       would be set in suspend. The voltage for suspend also can be
>> +       adjusted among {regulator-suspend-min-microvolt,
>> +       regulator-suspend-max-microvolt} by calling
>> +       regulator_set_suspend_voltage(). This property is now deprecated,
>> +       setting voltage for suspend mode via API the regulator driver
>> +       provides is recommended.
>
> Please reword. This is Linux implementation details that shouldn't be in
> the binding.

Ok, I guess just updating this one instead of the whole patchset for
this minor modification should be fine.

>
>> +     - 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
>>