linux-kernel - Re: [PATCH v11 1/3] arm64: dts: qcom: sm8750: Add USB support to SM8750 SoCs

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Message-ID: <ev5gosxqguzdbufy72gcjmt4m4z6kc67jcaznrhvvjldcps4g5@fntcevrjpqsh>
Date: Sun, 2 Nov 2025 09:53:01 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Krishna Kurapati <krishna.kurapati@....qualcomm.com>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, Wesley Cheng <wesley.cheng@....qualcomm.com>, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v11 1/3] arm64: dts: qcom: sm8750: Add USB support to
 SM8750 SoCs

On Sun, Nov 02, 2025 at 12:43:07AM +0530, Akhil P Oommen wrote:
> On 11/1/2025 11:14 PM, Krishna Kurapati wrote:
> > From: Wesley Cheng <wesley.cheng@....qualcomm.com>
> > diff --git a/arch/arm64/boot/dts/qcom/sm8750.dtsi b/arch/arm64/boot/dts/qcom/sm8750.dtsi
[..]
> > +			power-domains = <&gcc GCC_USB30_PRIM_GDSC>;
> > +			required-opps = <&rpmhpd_opp_nom>;
> 
> Probably I am missing something, but which power domain associated to a
> rail is scaled to NOM corner here?
> 

That would be the parent of the GCC_USB30_PRIM_GDSC, which should be the
CX rail. We currently have a NOM requirement here just in case we're
going to operate a SuperSpeed link, and the driver doesn't scale.


That said, your question is very much valid, because on SM8750 GCC
doesn't specify CX as a power-domain of &gcc, this vote goes into the
void.

Regards,
Bjorn