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regulator: core: Support bypass mode

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Many regulators support a bypass mode where they simply switch their
input supply to the output. This is mainly used in low power retention
states where power consumption is extremely low so higher voltage or
less clean supplies can be used.

Support this by providing ops for the drivers and a consumer API which
allows the device to be put into bypass mode if all consumers enable it
and the machine enables permission for this.

This is not supported as a mode since the existing modes are rarely used
due to fuzzy definition and mostly redundant with modern hardware which is
able to respond promptly to load changes.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reviewed-by: Graeme Gregory <gg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2012-08-31 10:36:37 -07:00
commit f59c8f9fe6
5 changed files with 126 additions and 0 deletions
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8
include/linux/regulator/consumer.h
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@ -177,6 +177,8 @@ int regulator_set_mode(struct regulator *regulator, unsigned int mode);
unsigned int regulator_get_mode(struct regulator *regulator);
int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
int regulator_allow_bypass(struct regulator *regulator, bool allow);
/* regulator notifier block */
int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb);
@ -328,6 +330,12 @@ static inline int regulator_set_optimum_mode(struct regulator *regulator,
return REGULATOR_MODE_NORMAL;
}
static inline int regulator_allow_bypass(struct regulator *regulator,
bool allow)
{
return 0;
}
static inline int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb)
{