regulator: Provide optional dummy regulator for consumers
authorMark Brown <broonie@opensource.wolfsonmicro.com>
Fri, 12 Feb 2010 10:18:08 +0000 (10:18 +0000)
committerLiam Girdwood <lrg@slimlogic.co.uk>
Wed, 3 Mar 2010 14:49:26 +0000 (14:49 +0000)
commit34abbd68efe09765465b81dfedeee9994f13302f
tree24fe9ed360f8673f74fc513ac98347bc8896b3db
parent9a7f6a4c6edc84748c6477c9df56691a0e61b8fd
regulator: Provide optional dummy regulator for consumers

In order to ease transitions with drivers are boards start using regulators
provide an option to cause all regulator_get() calls to succeed, with a
dummy always on regulator being supplied where one has not been configured.
A warning is printed whenever the dummy regulator is used to aid system
development.

This regulator does not implement any regulator operations but will allow
simple consumers which only do enable() and disable() calls to run. It
is kept separate from the fixed voltage regulator to avoid Kconfig
confusion on the part of users when it is extended to allow boards to
explicitly use the dummy regulator to simplify cases where the majority
of supplies are from fixed regulators without software control.

This option is currently only effective for systems which do not specify
full constriants. If required an override could also be provided to allow
these systems to use the dummy regulator, though it is likely that
unconfigured supplies on such systems will lead to error due to
regulators being powered down more aggressively when not in use.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/core.c
drivers/regulator/dummy.c [new file with mode: 0644]
drivers/regulator/dummy.h [new file with mode: 0644]