linux-kernel - [RFC PATCH v1 0/2] Introduce dummy regulator consumer

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Message-ID: <20250607212654.126412-1-alex.vinarskis@gmail.com>
Date: Sat,  7 Jun 2025 23:25:37 +0200
From: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
To: Aleksandrs Vinarskis <alex.vinarskis@...il.com>,
	Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: Liam Girdwood <lgirdwood@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	jens.glathe@...schoolsolutions.biz,
	konrad.dybcio@....qualcomm.com
Subject: [RFC PATCH v1 0/2] Introduce dummy regulator consumer

Introduce a very simple dummy consumer driver. Designed to consume
a single regulator 'vdd', the driver will power-on on probe and PM
suspend (if supported), power-off on remove and PM resume (if enabled).

There are two main reasons for this driver:
1. Create a pseudo-consumer in place of real devices which are not or
   cannot be described in the device-tree. Examples would be integrated
   USB UVC camera (present on some arm64 laptops) or dedicated keyboard
   backlight regulator (hypothetical). Instead of leaving regulator
   without consumer and `regulator-always-on` property, one could bind
   to dummy consumer to save some power during suspend.
2. A great development tool.

Tested on Asus Zenbook A14 with webcamera indicator LED imitating vreg
enable pin.

Aleksandrs Vinarskis (2):
  regulator: Add dummy regulator consumer binding
  regulator: Introduce dummy regulator consumer driver

 .../bindings/regulator/dummy-consumer.yaml    | 39 +++++++++
 drivers/regulator/Kconfig                     |  9 ++
 drivers/regulator/Makefile                    |  1 +
 drivers/regulator/dummy-consumer.c            | 85 +++++++++++++++++++
 4 files changed, 134 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/regulator/dummy-consumer.yaml
 create mode 100644 drivers/regulator/dummy-consumer.c

-- 
2.45.2