linux-kernel - Re: [PATCH v5 05/14] phy: qcom: qmp-usbc: Move reset config into PHY cfg

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Message-ID: <c95870e8-e481-4d3a-ba4b-b990381b3d45@oss.qualcomm.com>
Date: Mon, 22 Sep 2025 18:38:53 +0800
From: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        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>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        fange.zhang@....qualcomm.com, yongxing.mou@....qualcomm.com,
        li.liu@....qualcomm.com, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Subject: Re: [PATCH v5 05/14] phy: qcom: qmp-usbc: Move reset config into PHY
 cfg


On 9/22/2025 5:40 PM, Dmitry Baryshkov wrote:
> On Mon, Sep 22, 2025 at 04:04:42PM +0800, Xiangxu Yin wrote:
>> On 9/20/2025 12:45 AM, Dmitry Baryshkov wrote:
>>> On Fri, Sep 19, 2025 at 10:24:22PM +0800, Xiangxu Yin wrote:
>>>> Move resets to qmp_phy_cfg for per-PHY customization. Keep legacy DT
>>>> path on the old hardcoded list; non-legacy path uses cfg->reset_list.
>>> Why? Start your commit messages with the description of the issue that
>>> you are trying to solve.
>>
>> The original reset list only works for USB-only PHYs. USB3DP PHYs need different
>> reset names like "dp_phy", so they use a separate list. Moving resets to
>> qmp_phy_cfg enables per-PHY config without special-case logic in DT parsing.
>> I will update commit msg with issue description.
>>
>> Or do you suggest using (offs->dp_serdes != 0) to choose the reset list instead
>> using new attributes?
> You can't because othe DP PHYs supported by this driver will use 3
> resets: phy, phy_phy and dp_phy.


Ok, then I will update commit msg with issue description.


>>
>>>> Signed-off-by: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
>>>> ---
>>>>  drivers/phy/qualcomm/phy-qcom-qmp-usbc.c | 18 +++++++++++++++---
>>>>  1 file changed, 15 insertions(+), 3 deletions(-)
>>>>