linux-kernel - Re: [PATCH v2 1/3] dt-bindings: power: qcom,rpmpd: Add SA8155P

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Date:   Tue, 11 Apr 2023 20:03:05 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>
Subject: Re: [PATCH v2 1/3] dt-bindings: power: qcom,rpmpd: Add SA8155P



On 11.04.2023 19:37, Krzysztof Kozlowski wrote:
> On 11/04/2023 15:47, Konrad Dybcio wrote:
>> Add a compatible for SA8155P platforms and relevant defines to the
>> include file.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  Documentation/devicetree/bindings/power/qcom,rpmpd.yaml | 1 +
>>  include/dt-bindings/power/qcom-rpmpd.h                  | 9 +++++++++
>>  2 files changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
>> index afad3135ed67..f9c211a9a938 100644
>> --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
>> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
>> @@ -29,6 +29,7 @@ properties:
>>        - qcom,qcm2290-rpmpd
>>        - qcom,qcs404-rpmpd
>>        - qcom,qdu1000-rpmhpd
>> +      - qcom,sa8155p-rpmhpd
>>        - qcom,sa8540p-rpmhpd
>>        - qcom,sa8775p-rpmhpd
>>        - qcom,sdm660-rpmpd
>> diff --git a/include/dt-bindings/power/qcom-rpmpd.h b/include/dt-bindings/power/qcom-rpmpd.h
>> index 1bf8e87ecd7e..867b18e041ea 100644
>> --- a/include/dt-bindings/power/qcom-rpmpd.h
>> +++ b/include/dt-bindings/power/qcom-rpmpd.h
>> @@ -90,6 +90,15 @@
>>  #define SM8150_MMCX	9
>>  #define SM8150_MMCX_AO	10
>>  
>> +/* SA8155P is a special case, kept for backwards compatibility */
> 
> This is a new binding, thus I don't understand what is here backwards
> compatible?
Check the DT structure, 8155-adp (so, de facto 8155) included
8150 before, but that was not exactly the correct approach..
It bit us after we accidentally discovered 8155 advertises MMCX,
LCX and LMX PDs in cmd-db but triggers a bite on access attempts..

By mimicking the indices to match the ones of 8150, we only have
to fix up the domains that were axed from 8155 (in comparison to
8150 which has the full fat setup).

Konrad
> 
>> +#define SA8155P_CX	SM8150_CX
>> +#define SA8155P_CX_AO	SM8150_CX_AO
>> +#define SA8155P_EBI	SM8150_EBI
>> +#define SA8155P_GFX	SM8150_GFX
>> +#define SA8155P_MSS	SM8150_MSS
>> +#define SA8155P_MX	SM8150_MX
>> +#define SA8155P_MX_AO	SM8150_MX_AO
>> +
> 
> Best regards,
> Krzysztof
>