linux-kernel - Re: [PATCH v3 3/5] arm64: dts: qcom: Add support for Dell Inspiron 7441 / Latitude 7455

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Message-ID: <3cc15a65-abb8-453a-8798-fb21225dc18a@packett.cool>
Date: Tue, 15 Jul 2025 16:29:36 -0300
From: val@...kett.cool
To: Val Packett <val@...kett.cool>,
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 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>, Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] arm64: dts: qcom: Add support for Dell Inspiron
 7441 / Latitude 7455



On 7/15/25 3:00 PM, Val Packett <val@...kett.cool> wrote:
> 
> On 7/14/25 10:35 AM, Konrad Dybcio wrote:
> > On 7/6/25 10:50 PM, Val Packett wrote:
> >> +&usb_mp_dwc3 {
> >> +    phys = <&usb_mp_hsphy0>, <&usb_mp_qmpphy0>;
> >> +    phy-names = "usb2-0", "usb3-0";
> >> +};
> > Let's not override this, so that the driver can still put the
> > remaining ones to sleep cleanly

[..]

> So it seems like the other ones "don't exist" / have been shut down 
> completely by boot firmware(?)

Oh, oops - that actually happens because the PHYs are disabled in the DT.

Looking at other laptops, x1e80100-hp-omnibook-x14.dts has the same chunk
that changes usb_mp_dwc3 to only have two PHYs, while x1e80100-dell-xps13-9345.dts
lists both PHYs, but only one of them has a repeater attached, while the other
one is empty.

I'll do the XPS thing, sure.