linux-kernel - Re: [PATCH v2 14/16] arm64: dts: qcom: sc8280xp: Fix UFS PHY clocks

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Date: Wed, 24 Jan 2024 14:16:59 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: andersson@...nel.org, vkoul@...nel.org, sboyd@...nel.org,
	mturquette@...libre.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, quic_cang@...cinc.com
Subject: Re: [PATCH v2 14/16] arm64: dts: qcom: sc8280xp: Fix UFS PHY clocks

On Wed, Jan 03, 2024 at 02:50:04PM +0100, Konrad Dybcio wrote:
> On 20.12.2023 09:30, Manivannan Sadhasivam wrote:
> > On Wed, Dec 20, 2023 at 01:35:27AM +0100, Konrad Dybcio wrote:
> >> On 18.12.2023 13:07, Manivannan Sadhasivam wrote:
> >>> QMP PHY used in SC8280XP requires 3 clocks:
> >>>
> >>> * ref - 19.2MHz reference clock from RPMh
> >>> * ref_aux - Auxiliary reference clock from GCC
> >>> * qref - QREF clock from GCC
> >>>
> >>> Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> >>> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> >>> ---
> >>>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 18 ++++++++++++------
> >>>  1 file changed, 12 insertions(+), 6 deletions(-)
> >>>
> >>> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> >>> index cad59af7ccef..37344abbe8bf 100644
> >>> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> >>> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> >>> @@ -2256,9 +2256,12 @@ ufs_mem_phy: phy@...7000 {
> >>>  			compatible = "qcom,sc8280xp-qmp-ufs-phy";
> >>>  			reg = <0 0x01d87000 0 0x1000>;
> >>>  
> >>> -			clocks = <&gcc GCC_UFS_CARD_CLKREF_CLK>,
> >>> -				 <&gcc GCC_UFS_PHY_PHY_AUX_CLK>;
> >>> -			clock-names = "ref", "ref_aux";
> >>> +			clocks = <&rpmhcc RPMH_CXO_CLK>,
> >>> +				 <&gcc GCC_UFS_PHY_PHY_AUX_CLK>,
> >>> +				 <&gcc GCC_UFS_CARD_CLKREF_CLK>;
> >> GCC_UFS_REF_CLKREF_CLK
> > 
> > I'm not sure about this CLK. So I kept it as it is until I verify it.
> I am quite sure everything *UFS_CARD_* refers to the other UFS host..
> 

We cannot infer that from the naming. There is a chance that the same clock
could be routed to MEM_PHY internally. Moreover, there is no separate "ref"
clock for MEM_PHY though.

- Mani

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