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

[Aleksandrs Vinarskis <alex.vinarskis@gmail.com>]

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

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2.45.2