linux-kernel - Re: [PATCH v11 2/6] dt-bindings: display/msm: dp-controller: document QCS8300 compatible

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Message-ID: <jdbwncstextusng5boqg4v5r7krbnjts6f3zgd65cu4rrst7ay@kkod7ihbgfrp>
Date: Fri, 5 Sep 2025 16:48:05 +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 v11 2/6] dt-bindings: display/msm: dp-controller:
 document QCS8300 compatible

On Fri, Sep 05, 2025 at 10:50:33AM +0800, Yongxing Mou wrote:
> 
> 
> On 9/4/2025 9:43 PM, Dmitry Baryshkov wrote:
> > On Thu, Sep 04, 2025 at 03:22:37PM +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
> > > that supports 4 MST streams.
> > > 
> > > Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
> > > ---
> > >   .../bindings/display/msm/dp-controller.yaml        | 22 ++++++++++++++++++++++
> > >   1 file changed, 22 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> > > index aeb4e4f36044a0ff1e78ad47b867e232b21df509..ad08fd11588c45698f7e63ecc3218a749fc8ca67 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
> > 
> > Can we use fallback to qcom,sa8775p-dp instead of declaring a completely
> > new one?
> > 
> I think we can not use fallback to sa8775p, since we don't have DP1
> controller for QCS8300. SA8775P actually have 4 DP controllers (now only 2
> really used). So in the hardware, i think it is different with SA8775P and
> we need a new one.>>             - qcom,sa8775p-dp

The DP controller is the same as the one present on SA8775P.

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

-- 
With best wishes
Dmitry