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

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Message-ID: <b86a1759-e49f-48b1-833d-fdc37b450f5e@oss.qualcomm.com>
Date: Fri, 22 Aug 2025 11:06:58 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....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 2025/8/21 18:28, Dmitry Baryshkov wrote:
> 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.
> 
Thanks for point it.. "The Qualcomm QCS8300 platform comes with one 
DisplayPort controller that supports 4 MST streams", do you think this 
description will more appropriate?, only discusses the DP controller, 
not referencing the driver or SM8650..
>>
>> 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.
> 
Emm,thanks, i got this point. So here need add another clause only work 
for QCS8300(one DP controller with 4 streams), and i put codes before
"# Default to 2 streams MST", is this the correct place?

-          # Default to 2 streams MST
-          properties:
-            clocks:
-              minItems: 6
-              maxItems: 6
+          if:
+            properties:
+              compatible:
+                contains:
+                  enum:
+                    # QCS8300 only have one DP controllers support 4 
streams
+                    # MST, no second DP controller.
+                    -qcom,qcs8300-dp
+          then:
+            properties:
+              clocks:
+                minItems: 8
+                maxItems: 8
+          else:
+            # Default to 2 streams MST
+            properties:
+              clocks:
+                minItems: 6
+                maxItems: 6
>> +                - qcom,qcs8300-dp
>>                   - qcom,sa8775p-dp
>>         then:
>>           properties:
>>
>> -- 
>> 2.34.1
>>
>