linux-kernel - Re: [[PATCH v2 1/2] dt-bindings: opp: Add 'opp-microwatt' entry in the OPP

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Date:   Wed, 23 Feb 2022 08:39:06 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        rafael@...nel.org, daniel.lezcano@...aro.org, nm@...com,
        sboyd@...nel.org, mka@...omium.org, dianders@...omium.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [[PATCH v2 1/2] dt-bindings: opp: Add 'opp-microwatt' entry in
 the OPP



On 2/23/22 05:50, Viresh Kumar wrote:
> On 22-02-22, 14:07, Lukasz Luba wrote:
>> Add new entry for the OPP which provides information about power
>> expressed in micro-Watts. It is useful for the Energy Model framework.
>>
>> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
>> ---
>>   Documentation/devicetree/bindings/opp/opp-v2-base.yaml | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/opp/opp-v2-base.yaml b/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
>> index 15a76bcd6d42..3f07a279ed2a 100644
>> --- a/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
>> +++ b/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
>> @@ -93,6 +93,13 @@ patternProperties:
>>           minItems: 1
>>           maxItems: 8   # Should be enough regulators
>>   
>> +      opp-microwatt:
>> +        description:
>> +          Power for the OPP
>> +
>> +          A value representing power for the OPP in micro-Watts.
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +
> 
> I was expecting a much larger change here. Look at how opp-microvolt and
> opp-microamp is defined in this file.
> 
> Should this value be made per-supply/regulator, just like voltage/current ?
> 

For the EM we need only one value. If there would be some other users
of this field in future we might add the multiple power values support.
Currently there is no need I would say, unless it's a hard requirement
to be aligned with opp-microvolt.