linux-kernel - Re: [PATCH v3 3/4] dt-bindings: PCI: qcom: correct clocks for SM8150

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Message-ID: <cbf0b9a6-2752-4ab5-ab21-af28e87fc1e6@linaro.org>
Date:   Fri, 8 Dec 2023 13:17:58 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH v3 3/4] dt-bindings: PCI: qcom: correct clocks for SM8150

On 08/12/2023 12:09, Dmitry Baryshkov wrote:
> On Fri, 8 Dec 2023 at 12:52, Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>>
>> PCI node in Qualcomm SM8150 should have exactly 8 clocks, including the
>> ref clock.
>>
>> Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>
>> ---
>>
>> Please take the patch via PCI tree.
>>
>> Changes in v3:
>> 1. New patch: Split from sc8180x change.
>> 2. Add refclk as explained here:
>>    https://lore.kernel.org/all/20231121065440.GB3315@thinkpad/
>> ---
>>  .../devicetree/bindings/pci/qcom,pcie.yaml    | 26 +++++++++++++++++++
>>  1 file changed, 26 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
>> index 5214bf7a9045..a93ab3b54066 100644
>> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
>> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
>> @@ -559,6 +559,32 @@ allOf:
>>            contains:
>>              enum:
>>                - qcom,pcie-sm8150
>> +    then:
>> +      properties:
>> +        clocks:
>> +          minItems: 8
>> +          maxItems: 8
>> +        clock-names:
>> +          items:
>> +            - const: pipe # PIPE clock
>> +            - const: aux # Auxiliary clock
>> +            - const: cfg # Configuration clock
>> +            - const: bus_master # Master AXI clock
>> +            - const: bus_slave # Slave AXI clock
>> +            - const: slave_q2a # Slave Q2A clock
>> +            - const: tbu # PCIe TBU clock
>> +            - const: ref # REFERENCE clock
> 
> Can we change the order of the tbu and ref clocks and fold this into
> the sc810x case?

I prefer not, because this is an ABI-concern and we are supposed to keep
things stable.

Best regards,
Krzysztof