linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq9574: Fix 'l2' regulator min/max voltages

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Message-ID: <465751c4-a45a-41ce-ab65-ebddb71dd916@oss.qualcomm.com>
Date: Mon, 23 Jun 2025 13:34:22 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Varadarajan Narayanan <quic_varada@...cinc.com>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, lumag@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: ipq9574: Fix 'l2' regulator min/max
 voltages

On 6/23/25 1:32 PM, Varadarajan Narayanan wrote:
> The min and max voltages on l2 regulator is 850000uV. This was
> incorrectly set at 1800000uV earlier and that affected the
> stability of the networking subsystem.
> 
> Fixes: d5506524d9d9 ("arm64: dts: qcom: ipq9574: Add LDO regulator node")
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> ---

Shouldn't there be a consumer for it, instead of it being always-on?

Konrad

>  arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> index bdb396afb992..21b04a2c629d 100644
> --- a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> @@ -106,8 +106,8 @@ ipq9574_s1: s1 {
>  		};
>  
>  		mp5496_l2: l2 {
> -			regulator-min-microvolt = <1800000>;
> -			regulator-max-microvolt = <1800000>;
> +			regulator-min-microvolt = <850000>;
> +			regulator-max-microvolt = <850000>;
>  			regulator-always-on;
>  			regulator-boot-on;
>  		};
> 
> base-commit: 5d4809e25903ab8e74034c1f23c787fd26d52934