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regulator: Let drivers know when they use the stub API 

Have the stub variant of regulator_get() return NULL, so that drivers
can (but still don't have to) handle this case specifically.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Jerome Oufella <jerome.oufella@savoirfairelinux.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Jean Delvare 2010-04-03 17:37:45 +02:00 committed by Liam Girdwood
parent 13bd8e4673
commit be1a50d4eb
1 changed files with 6 additions and 2 deletions
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8
include/linux/regulator/consumer.h
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@ -183,9 +183,13 @@ static inline struct regulator *__must_check regulator_get(struct device *dev,
{
/* Nothing except the stubbed out regulator API should be
* looking at the value except to check if it is an error
* value so the actual return value doesn't matter.
* value. Drivers are free to handle NULL specifically by
* skipping all regulator API calls, but they don't have to.
* Drivers which don't, should make sure they properly handle
* corner cases of the API, such as regulator_get_voltage()
* returning 0.
*/
return (struct regulator *)id;
return NULL;
}
static inline void regulator_put(struct regulator *regulator)
{