linux-kernel - Re: [PATCH 1/2] dt-bindings: arm-smmu: Document SM61[12]5 GPU SMMU

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Message-ID: <f09e93e1-235a-ea0a-902d-4f41a8c90ee5@linaro.org>
Date:   Thu, 16 Mar 2023 20:29:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: arm-smmu: Document SM61[12]5 GPU SMMU

On 15/03/2023 11:52, Konrad Dybcio wrote:
> Both of these SoCs have a Qualcomm MMU500 implementation of SMMU
> in front of their GPUs that expect 3 clocks. Both of them also have
> an APPS SMMU that expects no clocks. Remove qcom,sm61[12]5-smmu-500
> from the "no clocks" list (intentionally 'breaking' the schema checks
> of APPS SMMU, as now it *can* accept clocks - with the current
> structure of this file it would have taken a wastefully-long time to
> sort this out properly..) and add necessary yaml to describe the
> clocks required by the GPU SMMUs.


> +      properties:
> +        compatible:
> +          items:
> +            - enum:
> +                - qcom,sm6115-smmu-500
> +                - qcom,sm6125-smmu-500
> +            - const: qcom,adreno-smmu
> +            - const: qcom,smmu-500
> +            - const: arm,mmu-500

If you drop the hunk later (from allOf:if), then what clocks do you
expect for non-GPU SMMU?

> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: mem
> +            - const: hlos
> +            - const: iface
> +
> +        clocks:
> +          items:
> +            - description: GPU memory bus clock
> +            - description: Voter clock required for HLOS SMMU access
> +            - description: Interface clock required for register access
> +
>    # Disallow clocks for all other platforms with specific compatibles
>    - if:
>        properties:
> @@ -394,8 +420,6 @@ allOf:
>                - qcom,sdm845-smmu-500
>                - qcom,sdx55-smmu-500
>                - qcom,sdx65-smmu-500
> -              - qcom,sm6115-smmu-500
> -              - qcom,sm6125-smmu-500
>                - qcom,sm6350-smmu-500
>                - qcom,sm6375-smmu-500
>                - qcom,sm8350-smmu-500
> 

Best regards,
Krzysztof