From 688fe99a439f7c9dfcc52fbf7cb347f140a2dc8b Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 5 Oct 2010 19:18:32 -0700 Subject: [PATCH] regulator: Add option for machine drivers to enable the dummy regulator Allow machine drivers to explicitly enable the use of the dummy regulator, enabling simpler support for systems with only a few specific supplies visible to software. It is strongly recommended that this is not used on systems with substantial software control over their PMICs, for maximum functionality constrints should be as fully specified as possible. Signed-off-by: Mark Brown Signed-off-by: Liam Girdwood --- drivers/regulator/Makefile | 3 +-- drivers/regulator/core.c | 22 ++++++++++++++++++++++ include/linux/regulator/machine.h | 5 +++++ 3 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 6cae6419b8b1..bff815736780 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -3,14 +3,13 @@ # -obj-$(CONFIG_REGULATOR) += core.o +obj-$(CONFIG_REGULATOR) += core.o dummy.o obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o -obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index cc8b337b9119..4fa08c85f3ce 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -33,6 +33,7 @@ static DEFINE_MUTEX(regulator_list_mutex); static LIST_HEAD(regulator_list); static LIST_HEAD(regulator_map_list); static int has_full_constraints; +static bool board_wants_dummy_regulator; /* * struct regulator_map @@ -1108,6 +1109,11 @@ static struct regulator *_regulator_get(struct device *dev, const char *id, } } + if (board_wants_dummy_regulator) { + rdev = dummy_regulator_rdev; + goto found; + } + #ifdef CONFIG_REGULATOR_DUMMY if (!devname) devname = "deviceless"; @@ -2462,6 +2468,22 @@ void regulator_has_full_constraints(void) } EXPORT_SYMBOL_GPL(regulator_has_full_constraints); +/** + * regulator_use_dummy_regulator - Provide a dummy regulator when none is found + * + * Calling this function will cause the regulator API to provide a + * dummy regulator to consumers if no physical regulator is found, + * allowing most consumers to proceed as though a regulator were + * configured. This allows systems such as those with software + * controllable regulators for the CPU core only to be brought up more + * readily. + */ +void regulator_use_dummy_regulator(void) +{ + board_wants_dummy_regulator = true; +} +EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); + /** * rdev_get_drvdata - get rdev regulator driver data * @rdev: regulator diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h index e2980287245e..761c745b9c24 100644 --- a/include/linux/regulator/machine.h +++ b/include/linux/regulator/machine.h @@ -189,10 +189,15 @@ int regulator_suspend_prepare(suspend_state_t state); #ifdef CONFIG_REGULATOR void regulator_has_full_constraints(void); +void regulator_use_dummy_regulator(void); #else static inline void regulator_has_full_constraints(void) { } + +static inline void regulator_use_dummy_regulator(void) +{ +} #endif #endif -- 2.34.1