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regmap: Allow regmap_update_bits() users to detect changes

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Some users of regmap_update_bits() would like to be able to tell their
users if they actually did an update so provide a variant which also
returns a flag indicating if an update took place. We could return a
tristate in the return value of regmap_update_bits() but this makes the
API more cumbersome to use and doesn't fit with the general zero for
success idiom we have.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown
2011-11-29 20:10:36 +00:00
parent c86845dc7b
commit 018690d33e
2 changed files with 48 additions and 13 deletions
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3
include/linux/regmap.h
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@@ -138,6 +138,9 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
size_t val_count);
int regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val);
int regmap_update_bits_check(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
int regcache_sync(struct regmap *map);
void regcache_cache_only(struct regmap *map, bool enable);