linux-kernel - Re: [PATCH v6 1/4] dt-bindings: display: msm: Add SM6150 DisplayPort controller

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Message-ID: <hzmwjn6xmb3kqvbvhhvycoskor4avtuuaubda5m3vmouten7z7@bvo53uektqln>
Date: Tue, 28 Oct 2025 21:58:30 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: xiangxu.yin@....qualcomm.com, Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.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>,
        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,
        fange.zhang@....qualcomm.com, yongxing.mou@....qualcomm.com,
        li.liu@....qualcomm.com
Subject: Re: [PATCH v6 1/4] dt-bindings: display: msm: Add SM6150 DisplayPort
 controller

On Mon, Oct 27, 2025 at 01:54:43PM -0500, Bjorn Andersson wrote:
> On Fri, Oct 24, 2025 at 01:21:01PM +0800, Xiangxu Yin via B4 Relay wrote:
> > From: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
> > 
> > SM6150 uses the same DisplayPort controller as SM8150, which is already
> > compatible with SM8350. Add the SM6150-specific compatible string and
> > update the binding example accordingly.
> > 
> > Signed-off-by: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
> > ---
> >  .../devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml      | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml
> > index 9ac24f99d3ada1c197c9654dc9babebccae972ed..ba0dea2edea98cee0826cf38b3f33361666e004a 100644
> > --- a/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml
> > +++ b/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml
> > @@ -51,6 +51,16 @@ patternProperties:
> >        compatible:
> >          const: qcom,sm6150-dpu
> >  
> > +  "^displayport-controller@[0-9a-f]+$":
> > +    type: object
> > +    additionalProperties: true
> > +    properties:
> > +      compatible:
> > +        items:
> > +          - const: qcom,sm6150-dp
> > +          - const: qcom,sm8150-dp
> 
> Perhaps I'm missing something, but if sm6150-dp is the same controller
> as sm8150-dp, which is the same controller as sm8350-dp...doesn't that
> imply that sm6150-dp is the same as sm8350-dp and we could not mention
> the sm8150-dp here?

sm6150-dp is the same as sm8150-dp. sm8150-dp is compatible with
sm8350-dp, but it's not the same version.

> 
> Regards,
> Bjorn
> 
> > +          - const: qcom,sm8350-dp
> > +
> >    "^dsi@[0-9a-f]+$":
> >      type: object
> >      additionalProperties: true
> > 
> > -- 
> > 2.34.1
> > 
> > 

-- 
With best wishes
Dmitry