linux-kernel - Re: [PATCH v7 2/6] dt-bindings: display/msm: dp-controller: document QCS8300 compatible

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Message-ID: <20250819-ant-of-ultimate-genius-fbfa1a@kuoka>
Date: Tue, 19 Aug 2025 09:58:25 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
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 v7 2/6] dt-bindings: display/msm: dp-controller: document
 QCS8300 compatible

On Tue, Aug 19, 2025 at 11:33:29AM +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. But it requires new compatible string
> because QCS8300 controller supports 4 MST streams. 4 MST streams will
> be enabled as part of MST feature support. Currently, using SM8650 as
> fallback to enable SST on QCS8300.

I don't think last sentence is true. Where in current code SM8650 is
used as fallback?

> 
> 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

...here not.

>            - qcom,sa8775p-dp
>            - qcom,sc7180-dp
>            - qcom,sc7280-dp

Best regards,
Krzysztof