linux-kernel - Re: [PATCH v3 01/14] dt-bindings: display/msm: dp-controller: Add sm6150

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Message-ID: <f49b34be-89d3-498d-8b85-ff6b0be01acf@oss.qualcomm.com>
Date: Tue, 2 Sep 2025 12:42:44 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Xiangxu Yin <xiangxu.yin@....qualcomm.com>,
        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>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, fange.zhang@....qualcomm.com,
        yongxing.mou@....qualcomm.com, tingwei.zhang@....qualcomm.com,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, quic_lliu6@...cinc.com
Subject: Re: [PATCH v3 01/14] dt-bindings: display/msm: dp-controller: Add
 sm6150

On 9/1/25 2:32 PM, Xiangxu Yin wrote:
> 
> On 8/28/2025 7:05 PM, Dmitry Baryshkov wrote:
>> On 28/08/2025 07:51, Xiangxu Yin wrote:
>>>
>>> On 8/20/2025 6:18 PM, Dmitry Baryshkov wrote:
>>>> On Wed, Aug 20, 2025 at 05:34:43PM +0800, Xiangxu Yin wrote:
>>>>> Add DisplayPort controller for Qualcomm SM6150 SoC.
>>>>> While SM6150 currently shares the same configuration as SC7180,
>>>>> its hardware capabilities differ. Explicitly listing it ensures clarity
>>>>> and avoids potential issues if SC7180 support evolves in the future.
>>>> I assume, it has no MST support. Am I right?
>>>
>>>
>>>  From sm6150 ipcat, I found MST-related registers and pixel1 clk definition.
>>
>> Then please describe MST as the main difference between SM6150 and SC7180 (which doesn't have MST).
>>
>> Also this needs to be rebased on top of the MST bindings. I've picked up the latest posted revision, but basing on the on-list discussion I might need to drop it and post another iteration. 
>>
> 
> Would you prefer I keep the current patch and update the description of the
> MST capability difference with SC7180 in the commit message, or rebase on
> your series and update the dt-binding accordingly?
> https://lore.kernel.org/all/20250829-dp_mst_bindings-v7-0-2b268a43917b@oss.qualcomm.com
> 
> Since MST support is not yet mainlined in the DP driver, even if I rebase
> now, the final implementation may require redefining msm_dp_desc for
> SM6150 in both the dt-binding and the driver once MST lands.

dt-bindings must describe the hardware regardless of the current driver
functionality (which is unfortunately something we've not paid sufficient
attention to before and we're now untangling some messy files..)

Konrad