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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <65dfd4c2-37bb-4d99-8753-ce17e17097d2@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 10:58:54 +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 2025/8/22 18:34, Dmitry Baryshkov wrote:
> On Fri, Aug 22, 2025 at 11:06:58AM +0800, Yongxing Mou wrote:
>>
>>
>> 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..
> 
> Yes
> 
>>>>
>>>> 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
> 
> typo, controller.
> 
Got it.
>> streams
>> +                    # MST, no second DP controller.
>> +                    -qcom,qcs8300-dp
> 
> Missing whitespace, drop the "second DP controller" phrase.
> 
Thanks for review and point it , will update next patch.
>> +          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
>>>>
>>>
>>
>