linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-akatsuki: Round down l22a regulator voltage

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Date:   Mon, 20 Jun 2022 23:13:18 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-akatsuki: Round down l22a
 regulator voltage



On 20.06.2022 23:12, Marijn Suijten wrote:
> 2700000 is not a multiple of pmic4_pldo's step size of 8000 (with base
> voltage 1664000), resulting in pm8998-rpmh-regulators not probing.  Just
> as we did with MSM8998's Sony Yoshino Poplar [1], round the voltages
> down to err on the cautious side and leave a comment in place to
> document this discrepancy wrt downstream sources.
> 
> [1]: https://lore.kernel.org/linux-arm-msm/20220507153627.1478268-1-marijn.suijten@somainline.org/
> 
> Fixes: 30a7f99befc6 ("arm64: dts: qcom: Add support for SONY Xperia XZ2 / XZ2C / XZ3 (Tama platform)")
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Konrad
>  .../arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
> index 36ff1178b705..3839850cf7dd 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
> @@ -22,8 +22,9 @@ &vreg_l14a_1p8 {
>  };
>  
>  &vreg_l22a_2p8 {
> -	regulator-min-microvolt = <2700000>;
> -	regulator-max-microvolt = <2700000>;
> +	/* Note: Round-down from 2700000 to be a multiple of PLDO step-size 8000 */
> +	regulator-min-microvolt = <2696000>;
> +	regulator-max-microvolt = <2696000>;
>  };
>  
>  &vreg_l28a_2p8 {