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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 <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-10-05 19:18:32 -07:00 committed by Liam Girdwood
parent 993af7c048
commit 688fe99a43
3 changed files with 28 additions and 2 deletions
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3
drivers/regulator/Makefile
View File

@ -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

22
drivers/regulator/core.c
View File

@ -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

5
include/linux/regulator/machine.h
View File

@ -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