diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 6cae6419b8b17dcf4c4f0da05e4cdb8e8089e0bc..bff81573678000503a71e6304581a69e41b85abc 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 cc8b337b9119de5e955aabe1935ad931a895c71a..4fa08c85f3cedbe1bdd32d6237fca81ffb389677 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 e2980287245e8cb28275dae09fcc33373fa6c538..761c745b9c24d11159c619e296c41fded18099f3 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