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Date:   Wed, 21 Jun 2023 23:45:22 +0200
From:   Marijn Suijten <marijn.suijten@somainline.org>
To:     Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc:     linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
        devicetree@vger.kernel.org, robdclark@gmail.com,
        quic_abhinavk@quicinc.com, dmitry.baryshkov@linaro.org,
        sean@poorly.run, airlied@gmail.com, daniel@ffwll.ch,
        robh+dt@kernel.org, dianders@chromium.org, david@ixit.cz,
        krzysztof.kozlowski+dt@linaro.org, swboyd@chromium.org,
        konrad.dybcio@somainline.org, agross@kernel.org,
        andersson@kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, Rob Herring <robh@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Subject: Re: [PATCH v9 2/2] dt-bindings: msm: dsi-controller-main: Document
 clocks on a per compatible basis
Message-ID: <qew6nd3jqnasb3mivvdxcwugfrvxdeafilaxk35v7uihagk2qi@oxe3oqdgfwpe>
References: <20230118171621.102694-1-bryan.odonoghue@linaro.org>
 <20230118171621.102694-3-bryan.odonoghue@linaro.org>
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In-Reply-To: <20230118171621.102694-3-bryan.odonoghue@linaro.org>
Precedence: bulk

Hi!

On 2023-01-18 17:16:21, Bryan O'Donoghue wrote:
> Each compatible has a different set of clocks which are associated with it.
> Add in the list of clocks for each compatible.

So if each set of compatibles have their own unique set of clocks, is
there a reason to have so many duplicate then: blocks?  I ran into this
while preparing for submitting SM6125 DPU and having no clue where to
add it.

> Acked-by: Rob Herring <robh@kernel.org>
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
> ---
>  .../display/msm/dsi-controller-main.yaml      | 218 ++++++++++++++++--
>  1 file changed, 201 insertions(+), 17 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml b/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
> index 35668caa190c4..ad1ba15b74c19 100644
> --- a/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
> @@ -9,9 +9,6 @@ title: Qualcomm Display DSI controller
>  maintainers:
>    - Krishna Manikandan <quic_mkrishn@quicinc.com>
>  
> -allOf:
> -  - $ref: "../dsi-controller.yaml#"
> -
>  properties:
>    compatible:
>      oneOf:
> @@ -50,22 +47,23 @@ properties:
>      maxItems: 1
>  
>    clocks:
> -    items:
> -      - description: Display byte clock
> -      - description: Display byte interface clock
> -      - description: Display pixel clock
> -      - description: Display core clock
> -      - description: Display AHB clock
> -      - description: Display AXI clock
> +    description: |
> +      Several clocks are used, depending on the variant. Typical ones are::
> +       - bus:: Display AHB clock.
> +       - byte:: Display byte clock.
> +       - byte_intf:: Display byte interface clock.
> +       - core:: Display core clock.
> +       - core_mss:: Core MultiMedia SubSystem clock.

mm*??

> +       - iface:: Display AXI clock.
> +       - mdp_core:: MDP Core clock.
> +       - mnoc:: MNOC clock
> +       - pixel:: Display pixel clock.
> +    minItems: 3
> +    maxItems: 9
>  
>    clock-names:
> -    items:
> -      - const: byte
> -      - const: byte_intf
> -      - const: pixel
> -      - const: core
> -      - const: iface
> -      - const: bus
> +    minItems: 3
> +    maxItems: 9
>  
>    phys:
>      maxItems: 1
> @@ -161,6 +159,192 @@ required:
>    - assigned-clock-parents
>    - ports
>  
> +allOf:
> +  - $ref: ../dsi-controller.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,apq8064-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 7
> +        clock-names:
> +          items:
> +            - const: iface
> +            - const: bus
> +            - const: core_mmss
> +            - const: src
> +            - const: byte
> +            - const: pixel
> +            - const: core
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,msm8916-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 6
> +        clock-names:
> +          items:
> +            - const: mdp_core
> +            - const: iface
> +            - const: bus
> +            - const: byte
> +            - const: pixel
> +            - const: core

So this...

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,msm8953-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 6
> +        clock-names:
> +          items:
> +            - const: mdp_core
> +            - const: iface
> +            - const: bus
> +            - const: byte
> +            - const: pixel
> +            - const: core

Is the same as the above.  Can we merge msm8953 into msm8916 or do you
expect differences down the line?

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,msm8974-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 7
> +        clock-names:
> +          items:
> +            - const: mdp_core
> +            - const: iface
> +            - const: bus
> +            - const: byte
> +            - const: pixel
> +            - const: core
> +            - const: core_mmss
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,msm8996-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 7
> +        clock-names:
> +          items:
> +            - const: mdp_core
> +            - const: byte
> +            - const: iface
> +            - const: bus
> +            - const: core_mmss
> +            - const: pixel
> +            - const: core

This could be the same as msm8226/msm8974 if we reorder the entries.

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,msm8998-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 6
> +        clock-names:
> +          items:
> +            - const: byte
> +            - const: byte_intf
> +            - const: pixel
> +            - const: core
> +            - const: iface
> +            - const: bus

Then, here...

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,sc7180-dsi-ctrl
> +              - qcom,sc7280-dsi-ctrl
> +              - qcom,sm8250-dsi-ctrl
> +              - qcom,sm8150-dsi-ctrl
> +              - qcom,sm8250-dsi-ctrl
> +              - qcom,sm8350-dsi-ctrl
> +              - qcom,sm8450-dsi-ctrl
> +              - qcom,sm8550-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 6
> +        clock-names:
> +          items:
> +            - const: byte
> +            - const: byte_intf
> +            - const: pixel
> +            - const: core
> +            - const: iface
> +            - const: bus

... and here ...

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,sdm660-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 9
> +        clock-names:
> +          items:
> +            - const: mdp_core
> +            - const: byte
> +            - const: byte_intf
> +            - const: mnoc
> +            - const: iface
> +            - const: bus
> +            - const: core_mmss
> +            - const: pixel
> +            - const: core
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,sdm845-dsi-ctrl
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 6
> +        clock-names:
> +          items:
> +            - const: byte
> +            - const: byte_intf
> +            - const: pixel
> +            - const: core
> +            - const: iface
> +            - const: bus

and here, we have *three* identical lists of clocks.  Should they (have
been) combined?

I can send a patch fixing these all if desired!

- Marijn

> +
>  additionalProperties: false
>  
>  examples:
> -- 
> 2.38.1
>