linux-kernel - Re: [PATCH 1/1] arm64: dts: qcom: sm8350-sagami: UFS phy - add 'vdda-pll-supply' & 'vdda-phy-supply'

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Message-ID: <20220414141107.sazz72sl6giehpjx@SoMainline.org>
Date:   Thu, 14 Apr 2022 16:11:07 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.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,
        bjorn.andersson@...aro.org, konrad.dybcio@...ainline.org,
        Vinod Koul <vkoul@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>
Subject: Re: [PATCH 1/1] arm64: dts: qcom: sm8350-sagami: UFS phy - add
 'vdda-pll-supply' & 'vdda-phy-supply'

On 2022-04-14 17:59:28, Bhupesh Sharma wrote:
> As suggested by Bjorn during review of [1], the vdda-pll-supply' &
> 'vdda-phy-supply' supplies denote the power for the bus and the
> clock of the UFS PHY.
> 
> For pdx215 to have a functional UFS [..] safe to assume [..]

By "functional" you are referring to sending a certain UFS command that
accidentally wipes the bootloader [1] [2], turning the device into a
_very_ expensive (+$1000) paperweight?

[1]: https://lore.kernel.org/lkml/20211111184630.605035-1-konrad.dybcio@somainline.org/
[2]: https://github.com/kholk/kernel/commit/2e7a9ee1c91a016baa0b826a7752ec45663a0561

> In absence of the same 'make dtbs_check' leads to following warnings:
> 
> arch/arm64/boot/dts/qcom/sm8350-sony-xperia-sagami-pdx215.dt.yaml:
>  phy-wrapper@...9000: 'vdda-phy-supply' is a required property
> 
> arch/arm64/boot/dts/qcom/sm8350-sony-xperia-sagami-pdx215.dt.yaml:
>  phy-wrapper@...9000: 'vdda-pll-supply' is a required property
> 
> [1]. https://lore.kernel.org/lkml/20220228123019.382037-9-bhupesh.sharma@linaro.org/
> 
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: konrad.dybcio@...ainline.org
> Cc: Vinod Koul <vkoul@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  .../dts/qcom/sm8350-sony-xperia-sagami.dtsi   | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8350-sony-xperia-sagami.dtsi b/arch/arm64/boot/dts/qcom/sm8350-sony-xperia-sagami.dtsi
> index 90b13cbe2fa6..238ac9380ca2 100644
> --- a/arch/arm64/boot/dts/qcom/sm8350-sony-xperia-sagami.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8350-sony-xperia-sagami.dtsi
> @@ -3,6 +3,7 @@
>   * Copyright (c) 2021, Konrad Dybcio <konrad.dybcio@...ainline.org>
>   */
>  
> +#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
>  #include "sm8350.dtsi"
>  #include "pm8350.dtsi"
>  #include "pm8350b.dtsi"
> @@ -75,6 +76,27 @@ ramoops@...00000 {
>  	};
>  };
>  
> +&apps_rsc {
> +	pm8350-rpmh-regulators {
> +		compatible = "qcom,pm8350-rpmh-regulators";
> +		qcom,pmic-id = "b";
> +
> +		vreg_l1b_0p88: ldo1 {
> +			regulator-name = "vreg_l1b_0p88";
> +			regulator-min-microvolt = <912000>;
> +			regulator-max-microvolt = <920000>;
> +			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> +		};
> +
> +		vreg_l6b_1p2: ldo6 {
> +			regulator-name = "vreg_l6b_1p2";
> +			regulator-min-microvolt = <1200000>;
> +			regulator-max-microvolt = <1208000>;
> +			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> +		};
> +	};
> +};
> +
>  &adsp {
>  	status = "okay";
>  	firmware-name = "qcom/adsp.mbn";
> @@ -256,4 +278,7 @@ &usb_1_hsphy {
>  
>  &usb_1_qmpphy {
>  	status = "okay";
> +
> +	vdda-phy-supply = <&vreg_l6b_1p2>;
> +	vdda-pll-supply = <&vreg_l1b_0p88>;

I'm probably understanding your patch wrong, but this is the USB phy,
not the UFS phy?  The warning from dtbs_check on `phy-wrapper@...9000`
is also the `qmp-usb3-phy`, not the `qmp-ufs-phy` - seems this patch has
little to do with UFS after all?

>  };
> -- 
> 2.35.1
>