linux-kernel - Re: [PATCH v4 1/1] arm64: dts: qcom: sm8150: Add ufs power-domain entries

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Message-ID: <YlXKH6BpBh5h7y02@builder.lan>
Date:   Tue, 12 Apr 2022 13:51:11 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, bhupesh.linux@...il.com,
        agross@...nel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v4 1/1] arm64: dts: qcom: sm8150: Add ufs power-domain
 entries

On Wed 23 Mar 15:30 CDT 2022, Bhupesh Sharma wrote:

> Add power-domain entries for UFS phy node in sm8150 dts.
> 
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Rob Herring <robh@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
> Changes since v3:
> ----------------
> - v3 can be found here: https://lore.kernel.org/linux-arm-msm/20220303082140.240745-1-bhupesh.sharma@linaro.org/
> - Dropped [PATCH 1/2] from v3, which is already in linux-next now.
> - Addressed Dmitry's and Bjorn's review comments.
> - This patch is rebase on linux-next.
> 
>  arch/arm64/boot/dts/qcom/sm8150.dtsi | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> index 6012322a5984..eed601e70229 100644
> --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> @@ -1637,6 +1637,7 @@ ufs_mem_hc: ufshc@...4000 {
>  			phy-names = "ufsphy";
>  			lanes-per-direction = <2>;
>  			#reset-cells = <1>;
> +
>  			resets = <&gcc GCC_UFS_PHY_BCR>;
>  			reset-names = "rst";
>  
> @@ -1687,6 +1688,8 @@ ufs_mem_phy: phy@...7000 {
>  			clocks = <&gcc GCC_UFS_MEM_CLKREF_CLK>,
>  				 <&gcc GCC_UFS_PHY_PHY_AUX_CLK>;
>  
> +			power-domains = <&gcc UFS_PHY_GDSC>;
> +			power-domain-names = "ufs_phy_gdsc";

As far as I can tell the UFS PHY sits in the MX domain, while the
controller and perhaps the connection between the two sits in
UFS_PHY_GDSC.

So I believe the power-domains should be moved to the &ufs_mem_hc node.


There's no need for power-domain-names in either case.

Regards,
Bjorn

>  			resets = <&ufs_mem_hc 0>;
>  			reset-names = "ufsphy";
>  			status = "disabled";
> -- 
> 2.35.1
>