linux-kernel - Re: [PATCH 02/10] dt-bindings: power: Add rpm power domains for SDX75

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Message-ID: <17dc53d0-2f30-1d54-ccbe-d829a681ad06@quicinc.com>
Date:   Wed, 5 Jul 2023 16:50:21 +0530
From:   Rohit Agarwal <quic_rohiagar@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <lee@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linus.walleij@...aro.org>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <sboyd@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 02/10] dt-bindings: power: Add rpm power domains for SDX75


On 7/5/2023 4:13 PM, Konrad Dybcio wrote:
> On 5.07.2023 10:54, Rohit Agarwal wrote:
>> On 7/4/2023 11:47 AM, Rohit Agarwal wrote:
>>> On 7/3/2023 8:29 PM, Konrad Dybcio wrote:
>>>> On 3.07.2023 16:42, Rohit Agarwal wrote:
>>>>> Add RPM power domain bindings for the SDX75 SoC.
>>>>>
>>>>> Signed-off-by: Rohit Agarwal <quic_rohiagar@...cinc.com>
>>>>> ---
>>>>>    Documentation/devicetree/bindings/power/qcom,rpmpd.yaml | 1 +
>>>>>    include/dt-bindings/power/qcom-rpmpd.h                  | 8 ++++++++
>>>>>    2 files changed, 9 insertions(+)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
>>>>> index afad313..58e1be8 100644
>>>>> --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
>>>>> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
>>>>> @@ -40,6 +40,7 @@ properties:
>>>>>          - qcom,sdm845-rpmhpd
>>>>>          - qcom,sdx55-rpmhpd
>>>>>          - qcom,sdx65-rpmhpd
>>>>> +      - qcom,sdx75-rpmhpd
>>>>>          - qcom,sm6115-rpmpd
>>>>>          - qcom,sm6125-rpmpd
>>>>>          - qcom,sm6350-rpmhpd
>>>>> diff --git a/include/dt-bindings/power/qcom-rpmpd.h b/include/dt-bindings/power/qcom-rpmpd.h
>>>>> index 1bf8e87..8092d0d 100644
>>>>> --- a/include/dt-bindings/power/qcom-rpmpd.h
>>>>> +++ b/include/dt-bindings/power/qcom-rpmpd.h
>>>>> @@ -57,6 +57,14 @@
>>>>>    #define SDX65_CX_AO    4
>>>>>    #define SDX65_MXC    5
>>>>>    +/* SDX75 Power Domain Indexes */
>>>>> +#define SDX75_CX    0
>>>>> +#define SDX75_CX_AO    1
>>>>> +#define SDX75_MSS    2
>>>>> +#define SDX75_MX    3
>>>>> +#define SDX75_MX_AO    4
>>>>> +#define SDX75_MXC    5
>>>> Please instead introduce a set of defines without the SoC prefix
>>>> (i.e. CX, CX_AO, MX etc.). We've been putting this off for too long
>>>> and you're the first unlucky guy that submitted new RPMhPD support after
>>>> we've concluded it'd be the way to go! :D Sadly, we can't replace the
>>>> existing ones retroactively..
>>> Surely No issues. Will update it.
>> I have a doubt here. Cant we completely omit the #defines here and directly index this as 0,1,...
>> because if the intention of this #defines is to understand the name of the pd then we can get
>> it from the .name attribute in rpmhpd as well, right?
>>
>> The problems with a common set of #define would be, lets say if we define CX_AO as 1 and some platform
>> doesn't have CX_AO then wouldnt it leave a null entry in the driver entry of that platform?
> Yes.
>
> We already do this in the rpmh clock driver, as:
>
> 1. there are domains that all chips share (like CX etc.)
> 2. wasting a couple of bytes lets us massively save on convolution
Ok, got it. Looks cleaner.

Thanks,
Rohit.
>
> Konrad
>> Thanks,
>> Rohit.
>>
>>> Thanks,
>>> Rohit.
>>>> Konrad
>>>>> +
>>>>>    /* SM6350 Power Domain Indexes */
>>>>>    #define SM6350_CX    0
>>>>>    #define SM6350_GFX    1