linux-kernel - Re: [PATCH v8 2/6] dt-bindings: display/msm: dp-controller: document QCS8300 compatible

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Message-ID: <3ws6xfmmrnjybn4umbbnzjdksqberzuxslz6uxpabtsz2yzyss@jwblshilyx4p>
Date: Thu, 21 Aug 2025 13:28:18 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <yongxing.mou@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.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
Subject: Re: [PATCH v8 2/6] dt-bindings: display/msm: dp-controller: document
 QCS8300 compatible

On Thu, Aug 21, 2025 at 11:35:57AM +0800, Yongxing Mou wrote:
> Add compatible string for the DisplayPort controller found on the
> Qualcomm QCS8300 SoC.
> 
> The Qualcomm QCS8300 platform comes with one DisplayPort controller
> with same base offset as SM8650. It requires new compatible string
> because QCS8300 controller supports 4 MST streams. And 4 MST streams
> support will be enabled as part of MST feature support. Currently, using
> SM8650 data structure to enable SST on QCS8300 in the driver.

Bindings describe the hardware. There is no point in discussing the
driver here.

> 
> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
> ---
>  Documentation/devicetree/bindings/display/msm/dp-controller.yaml | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> index 68a6fd27506fda004e53174db5bcc88a29e8d2a6..ac44abfdd2853393ae199387c9ae2c37e1c48f52 100644
> --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> @@ -18,6 +18,7 @@ properties:
>    compatible:
>      oneOf:
>        - enum:
> +          - qcom,qcs8300-dp
>            - qcom,sa8775p-dp
>            - qcom,sc7180-dp
>            - qcom,sc7280-dp
> @@ -179,6 +180,7 @@ allOf:
>            compatible:
>              contains:
>                enum:
> +                - qcom,qcs8300-dp
>                  - qcom,sa8775p-dp
>                  - qcom,x1e80100-dp
>        then:
> @@ -217,8 +219,9 @@ allOf:
>            compatible:
>              contains:
>                enum:
> -                # some of SA8775P DP controllers support 4 streams MST,
> +                # SA8775P DP0 and QCS8300 DP controllers support 4 streams MST,
>                  # others just 2 streams MST

QCS8300 has only one DP. As such, it doesn't belong to this clause.

> +                - qcom,qcs8300-dp
>                  - qcom,sa8775p-dp
>        then:
>          properties:
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry