regulator: Updates for v6.10

There's one API update here, a new API factoring out a common pattern
for reference voltage supplies.  These are supplies uses as a reference
by analogue circuits where the consumer requests and enables the supply,
reads the voltage to calibrate the user and then never touches it again.
This is factored out into a single operation which just returns the
voltage and uses devm_ to manage the request and enable portion.

Otherwise this has been a very quiet release, we've got some new device
support, some small fixes, housekeeping and cleanup work but nothing
substantial.

There's also some non-regulator changes in here, a number of users for
the new reference voltage API were merged along with it and some MFD
changes were pulled in as dependencies for new driver work.

Highlights:

 - Add a new API for single operation handling of reference voltages.
 - Support for Allwinner AXP717 and D1, and NXP PCA9561A.
regulator: sun20i: Add Allwinner D1 LDOs driver

D1 contains two pairs of LDOs, "analog" LDOs and "system" LDOs. They are
similar and can share a driver, but only the system LDOs have a DT
binding defined so far.

The system LDOs have a single linear range. The voltage step is not an
integer, so a custom .list_voltage is needed to get the rounding right.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20240509153107.438220-3-wens@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
3 files changed