linux-kernel - Re: [PATCH v9 3/3] arm64: dts: qcom: sc8280xp-blackrock: dt definition for WDK2023

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Message-ID: <7f5d424d-09a1-46ca-92a6-a1e7f8084bf0@oldschoolsolutions.biz>
Date: Tue, 3 Dec 2024 08:07:55 +0100
From: Jens Glathe <jens.glathe@...schoolsolutions.biz>
To: Krishna Kurapati <krishna.kurapati@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: Kalle Valo <kvalo@...nel.org>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Rob Herring <robh@...nel.org>, Merck Hung <merckhung@...il.com>,
 xlazom00@...il.com, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: Re: [PATCH v9 3/3] arm64: dts: qcom: sc8280xp-blackrock: dt
 definition for WDK2023

On 03.12.24 06:08, Krishna Kurapati wrote:

[...]
>
> Although functionally unused, there is one more connector node that
> runs between QMPPHY and DWC3 node. For example in [1], please check
> "usb_dp_qmpphy_usb_ss_in" and "usb_1_dwc3_ss"
>
> Would be good to check why it is missing and add it further.
>
> [1]:
> https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>
>
I checked, there's an extra endpoint for usb_?_qmpphy_usb_ss_in and
usb_?_qmpphy_dp_in.  usb_?_qmpphy_usb_ss_in  are defined (and "wired")
between port@1 of usb_?_qmpphy and port@1 of usb_?_dwc3, in
sc8280xp.dtsi. On port@2 of the qmpphy is usb_?_qmpphy_dp_in as
endpoint, which is further defined in sc8280xp-microsoft-blackrock.dts
as connecting to mdss0_dp?_out. Maybe that's wrong, it's the same as in
sc8280xp-lenvo-thinkpad-x13s.dts.

with best regards

Jens