linux-kernel - Re: [PATCH v11 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] [thread-next>] [day] [month] [year] [list]

Message-ID: <4a475efc-7da6-4456-ba6a-ef3320fea3d2@oss.qualcomm.com>
Date: Mon, 8 Sep 2025 17:46:14 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        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 9/5/2025 4:25 PM, Krzysztof Kozlowski wrote:
> 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
> 
> I don't understand how this rationale explains what Dmitry asked.
> 
> Why number of IP blocks (and this is DPx, right?) matter? Are you sure
> you understand what compatibility means? Please read the slides from
> OSSE25 or just read writing bindings.
> 
> Best regards,
> Krzysztof
> 
Sure.. I’ll discuss this further here to make sure I fully understand 
these comments.