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: <Z8gPaoqLiC_b2s3I@hovoldconsulting.com>
Date: Wed, 5 Mar 2025 09:46:34 +0100
From: Johan Hovold <johan@...nel.org>
To: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	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 Sun, Mar 02, 2025 at 11:04:03PM +0100, Aleksandrs Vinarskis wrote:
> 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?

A host of things, including pull-ups, level shifters, regulators for
(partially) described devices, but also things like the speakers and
wlan.

> > 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.

Johan