From 34abbd68efe09765465b81dfedeee9994f13302f Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 12 Feb 2010 10:18:08 +0000 Subject: 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 Signed-off-by: Liam Girdwood --- drivers/regulator/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/regulator/Kconfig') diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 3c07169..834b484 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -27,6 +27,17 @@ config REGULATOR_DEBUG help Say yes here to enable debugging support. +config REGULATOR_DUMMY + bool "Provide a dummy regulator if regulator lookups fail" + help + If this option is enabled then when a regulator lookup fails + and the board has not specified that it has provided full + constraints then the regulator core will provide an always + enabled dummy regulator will be provided, allowing consumer + drivers to continue. + + A warning will be generated when this substitution is done. + config REGULATOR_FIXED_VOLTAGE tristate "Fixed voltage regulator support" help -- cgit v1.1