linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: sc8280xp: Correct USB PHY power domains

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Date: Fri, 29 Dec 2023 22:40:08 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Johan Hovold <johan@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH 2/3] arm64: dts: qcom: sc8280xp: Correct USB PHY power
 domains

On Fri, Dec 29, 2023 at 02:01:06PM +0100, Johan Hovold wrote:
> On Wed, Dec 27, 2023 at 11:28:27PM +0100, Konrad Dybcio wrote:
> > The USB GDSCs are only related to the controllers.
> 
> Are you sure?
> 

Yes, that's what I was told by UFS and PCIe teams and some of the internal
documentation also confirms the same.

> > The PHYs on the other
> > hand, are powered by VDD_MX and their specific VDDA_PHY/PLL regulators.
> > 
> > Fix the power-domains assignment to stop potentially toggling the GDSC
> > unnecessarily.
> 
> Again, there's no additional toggling being done here, but yes, this may
> keep the domains enabled during suspend depending on how the driver is
> implemented.
> 
> If that's the concern, then please spell that out too.
> 
> > Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> 
> May not be needed either.
> 

Fixes tag is indeed needed on this platform and all other platforms too.

- Mani

> > @@ -2597,7 +2597,7 @@ usb_2_qmpphy0: phy@...f000 {
> >  				 <&gcc GCC_USB3UNIPHY_PHY_MP0_BCR>;
> >  			reset-names = "phy", "phy_phy";
> >  
> > -			power-domains = <&gcc USB30_MP_GDSC>;
> > +			power-domains = <&rpmhpd SC8280XP_MX>;
> 
> Johan
> 

-- 
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