linux-kernel - Re: [PATCH 7/7] arm64: dts: qcom: sm8350-hdk: Specify which LDO modes are allowed

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Message-ID: <05aba940-aeab-a480-2c33-e1f9009c99ce@somainline.org>
Date:   Fri, 26 Aug 2022 20:41:24 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andrew Halaney <ahalaney@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] arm64: dts: qcom: sm8350-hdk: Specify which LDO modes
 are allowed



On 25.08.2022 18:42, Douglas Anderson wrote:
> This board uses RPMH, specifies "regulator-allow-set-load" for LDOs,
> but doesn't specify any modes with "regulator-allowed-modes".
> 
> Prior to commit efb0cb50c427 ("regulator: qcom-rpmh: Implement
> get_optimum_mode(), not set_load()") the above meant that we were able
> to set either LPM or HPM mode. After that commit (and fixes [1]) we'll
> be stuck at the initial mode. Discussion of this has resulted in the
> decision that the old dts files were wrong and should be fixed to
> fully restore old functionality.
> 
> Let's re-enable the old functionality by fixing the dts.
> 
> [1] https://lore.kernel.org/r/20220824142229.RFT.v2.2.I6f77860e5cd98bf5c67208fa9edda4a08847c304@changeid
> 
> Fixes: 9208c19f2124 ("arm64: dts: qcom: Introduce SM8350 HDK")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Konrad

> 
>  arch/arm64/boot/dts/qcom/sm8350-hdk.dts | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8350-hdk.dts b/arch/arm64/boot/dts/qcom/sm8350-hdk.dts
> index 0fcf5bd88fc7..69ae6503c2f6 100644
> --- a/arch/arm64/boot/dts/qcom/sm8350-hdk.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8350-hdk.dts
> @@ -107,6 +107,9 @@ vreg_l5b_0p88: ldo5 {
>  			regulator-max-microvolt = <888000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>  			regulator-allow-set-load;
> +			regulator-allowed-modes =
> +			    <RPMH_REGULATOR_MODE_LPM
> +			     RPMH_REGULATOR_MODE_HPM>;
>  		};
>  
>  		vreg_l6b_1p2: ldo6 {
> @@ -115,6 +118,9 @@ vreg_l6b_1p2: ldo6 {
>  			regulator-max-microvolt = <1208000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>  			regulator-allow-set-load;
> +			regulator-allowed-modes =
> +			    <RPMH_REGULATOR_MODE_LPM
> +			     RPMH_REGULATOR_MODE_HPM>;
>  		};
>  
>  		vreg_l7b_2p96: ldo7 {
> @@ -123,6 +129,9 @@ vreg_l7b_2p96: ldo7 {
>  			regulator-max-microvolt = <2504000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>  			regulator-allow-set-load;
> +			regulator-allowed-modes =
> +			    <RPMH_REGULATOR_MODE_LPM
> +			     RPMH_REGULATOR_MODE_HPM>;
>  		};
>  
>  		vreg_l9b_1p2: ldo9 {
> @@ -131,6 +140,9 @@ vreg_l9b_1p2: ldo9 {
>  			regulator-max-microvolt = <1200000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>  			regulator-allow-set-load;
> +			regulator-allowed-modes =
> +			    <RPMH_REGULATOR_MODE_LPM
> +			     RPMH_REGULATOR_MODE_HPM>;
>  		};
>  	};
>