regulator: fan53555: enable vin supply

The regulator can be supplied by a parent regulator through its vin pin,
so add the supply_name for it.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
regulator: fan53555: set regulator name from constraints name

There is a high potential of more than one of those regulators existing
on a board, so name the regulator according to the name provided in the
initdata instead of statically.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
dt-bindings: add devicetree bindings for Fairchild FAN53555 regulators

Document the regulator and add a fairchild vendor-prefix.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
regulator: fan53555: add devicetree support

Add the ability to parse regulator-data from the devicetree.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
regulator: fan53555: add support for Silergy SYR82x regulators

Silergy SYR82x regulators share the exact same functionality and register layout
as the Fairchild FAN53555 regulators. Therefore extend the driver to add
support for them.

Both types use the same vendor id in their ID1 register, so it's not possible
to distinguish them automatically.

Similarly, the types also do not match. Type 8 used by the SYR827 and SYR828
start at 712.5mV and increment in 12.5mv steps, while the FAN53555 type 8
starts at 600mV and increments in 10mV steps.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>