linux-kernel - Re: [PATCH v3 2/2] arm64: dts: qcom: sm8150: Add ufs power-domain entries

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Message-ID: <YifhMiBXRMOCamOt@builder.lan>
Date:   Tue, 8 Mar 2022 17:05:22 -0600
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, sboyd@...nel.org, tdas@...eaurora.org,
        mturquette@...libre.com, linux-clk@...r.kernel.org,
        robh+dt@...nel.org, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 2/2] arm64: dts: qcom: sm8150: Add ufs power-domain
 entries

On Thu 03 Mar 02:21 CST 2022, Bhupesh Sharma wrote:

> Add power-domain entries for UFS controller & phy nodes
> 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>
> ---
>  arch/arm64/boot/dts/qcom/sm8150.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> index 6012322a5984..7aa879eb24d7 100644
> --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> @@ -1637,6 +1637,8 @@ ufs_mem_hc: ufshc@...4000 {
>  			phy-names = "ufsphy";
>  			lanes-per-direction = <2>;
>  			#reset-cells = <1>;
> +
> +			power-domains = <&gcc UFS_PHY_GDSC>;

It seems odd that the controller would be in the PHY power-domain?

>  			resets = <&gcc GCC_UFS_PHY_BCR>;
>  			reset-names = "rst";
>  
> @@ -1687,6 +1689,9 @@ ufs_mem_phy: phy@...7000 {
>  			clocks = <&gcc GCC_UFS_MEM_CLKREF_CLK>,
>  				 <&gcc GCC_UFS_PHY_PHY_AUX_CLK>;
>  
> +			power-domains = <&gcc UFS_CARD_GDSC>,
> +					<&gcc UFS_PHY_GDSC>;

And "card" is typically related to the second UFS interface, so I
suspect you only would need the last one of these?

Regards,
Bjorn

> +			power-domain-names = "ufs_card_gdsc", "ufs_phy_gdsc";
>  			resets = <&ufs_mem_hc 0>;
>  			reset-names = "ufsphy";
>  			status = "disabled";
> -- 
> 2.35.1
>