linux-kernel - Re: [PATCH 4/8] arm64: dts: qcom: x1e80100-dell-xps13-9345: mark l12b and l15b always-on

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Message-ID: <CAMcHhXp2im-55KxwSUj0pV_hmrg-HaV5RYB4jvPOoqOYjJuCYw@mail.gmail.com>
Date: Sun, 2 Mar 2025 23:04:03 +0100
From: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH 4/8] arm64: dts: qcom: x1e80100-dell-xps13-9345: mark l12b
 and l15b always-on

On Thu, 27 Feb 2025 at 09:15, Johan Hovold <johan+linaro@...nel.org> wrote:
>
> The l12b and l15b supplies are used by components that are not (fully)
> described (and some never will be) and must never be disabled.

Out of curiosity, what are these components?

>
> Mark the regulators as always-on to prevent them from being disabled,
> for example, when consumers probe defer or suspend.
>
> Note that these supplies currently have no consumers described in
> mainline.
>
> Fixes: f5b788d0e8cd ("arm64: dts: qcom: Add support for X1-based Dell XPS 13 9345")
> Cc: stable@...r.kernel.org      # 6.13
> Cc: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
Tested-by: Aleksandrs Vinarskis <alex.vinarskis@...il.com>

> ---
>  arch/arm64/boot/dts/qcom/x1e80100-dell-xps13-9345.dts | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100-dell-xps13-9345.dts b/arch/arm64/boot/dts/qcom/x1e80100-dell-xps13-9345.dts
> index 86e87f03b0ec..90f588ed7d63 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100-dell-xps13-9345.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e80100-dell-xps13-9345.dts
> @@ -359,6 +359,7 @@ vreg_l12b_1p2: ldo12 {
>                         regulator-min-microvolt = <1200000>;
>                         regulator-max-microvolt = <1200000>;
>                         regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> +                       regulator-always-on;
>                 };
>
>                 vreg_l13b_3p0: ldo13 {
> @@ -380,6 +381,7 @@ vreg_l15b_1p8: ldo15 {
>                         regulator-min-microvolt = <1800000>;
>                         regulator-max-microvolt = <1800000>;
>                         regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> +                       regulator-always-on;
>                 };
>
>                 vreg_l17b_2p5: ldo17 {
> --
> 2.45.3
>