linux-kernel - Re: [PATCH v3 03/12] dt-bindings: display/msm: sc7180-dpu: Describe SM6350 and SM6375

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Message-ID: <31147c6d-e77a-8abd-0b55-73ead2385bb9@linaro.org>
Date:   Sun, 7 May 2023 10:14:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev
Subject: Re: [PATCH v3 03/12] dt-bindings: display/msm: sc7180-dpu: Describe
 SM6350 and SM6375

On 05/05/2023 23:40, Konrad Dybcio wrote:
> SC7180, SM6350 and SM6375 use a rather similar hw setup for DPU, with
> the main exception being that the last one requires an additional
> throttle clock.
> 
> It is not well understood yet, but failing to toggle it on makes the
> display hardware stall and not output any frames.
> 
> Document SM6350 and SM6375 DPU.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  .../bindings/display/msm/qcom,sc7180-dpu.yaml      | 23 +++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml
> index 1fb8321d9ee8..630b11480496 100644
> --- a/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml
> @@ -13,7 +13,10 @@ $ref: /schemas/display/msm/dpu-common.yaml#
>  
>  properties:
>    compatible:
> -    const: qcom,sc7180-dpu
> +    enum:
> +      - qcom,sc7180-dpu
> +      - qcom,sm6350-dpu
> +      - qcom,sm6375-dpu
>  
>    reg:
>      items:
> @@ -26,6 +29,7 @@ properties:
>        - const: vbif
>  
>    clocks:
> +    minItems: 6
>      items:
>        - description: Display hf axi clock
>        - description: Display ahb clock
> @@ -33,8 +37,10 @@ properties:
>        - description: Display lut clock
>        - description: Display core clock
>        - description: Display vsync clock
> +      - description: Display core throttle clock
>  
>    clock-names:
> +    minItems: 6
>      items:
>        - const: bus
>        - const: iface
> @@ -42,6 +48,7 @@ properties:
>        - const: lut
>        - const: core
>        - const: vsync
> +      - const: throttle
>  
>  required:
>    - compatible
> @@ -52,6 +59,20 @@ required:
>  
>  unevaluatedProperties: false
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          const: qcom,sm6375-dpu

And the two other variants? Is the clock valid there or not? If not
really, then you should have else: with maxItems: 6.

> +
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 7
> +
> +        clock-names:
> +          minItems: 7

If there is going new version - put allOf: before
unevaluatedProperties:. Otherwise it is fine.

> +
>  examples:
>    - |
>      #include <dt-bindings/clock/qcom,dispcc-sc7180.h>
> 

Best regards,
Krzysztof