linux-kernel - Re: [PATCH RFT 2/3] arm64: dts: qcom: glymur: Add USB related nodes

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Message-ID: <4632ad3a-c893-449a-b0d1-48d9c93da7e9@oss.qualcomm.com>
Date: Tue, 27 Jan 2026 12:46:05 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Abel Vesa <abel.vesa@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Pankaj Patil <pankaj.patil@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Wesley Cheng <wesley.cheng@....qualcomm.com>
Subject: Re: [PATCH RFT 2/3] arm64: dts: qcom: glymur: Add USB related nodes

On 1/27/26 12:41 PM, Abel Vesa wrote:
> On 26-01-13 14:13:32, Konrad Dybcio wrote:
>> On 1/13/26 1:33 PM, Abel Vesa wrote:
>>> From: Wesley Cheng <wesley.cheng@....qualcomm.com>
>>>
>>> The Glymur USB system contains 3 USB type C ports, 1 USB multiport
>>> controller and a USB 2.0 only controller. This encompasses 5 SS USB QMP
>>> PHYs (3 combo and 2 uni) and 6 M31 eUSB2 PHYs. All controllers are SNPS
>>> DWC3 based, so describe them as flattened DWC3 QCOM nodes.
>>>
>>> Signed-off-by: Wesley Cheng <wesley.cheng@....qualcomm.com>
>>> Co-developed-by: Abel Vesa <abel.vesa@....qualcomm.com>
>>> Signed-off-by: Abel Vesa <abel.vesa@....qualcomm.com>
>>> ---
>>
>> [...]
>>
>>> +			snps,dis_u2_susphy_quirk;
>>> +			snps,dis_enblslpm_quirk;
>>> +			snps,dis_u3_susphy_quirk;
>>> +			snps,usb2-lpm-disable;
>>
>> Other SoCs have a list that's much longer, please consult Wesley if
>> this list is enough
> 
> Checked with Wesley. He confirmed that this trimmed list is fine.
> He said he dropped the rest since they are related to the power saving
> features like USB2/3 LPM (l1 or u1/u2) and we don't seem need those.

Is that to say that those erratas were fixed in this hardware?

Low-power states of the link are no less than desired is possible..

Konrad