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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-11-29 20:10:36 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-11-29 20:15:50 +0000 |
| commit | 018690d33ecf4aa1eb1415e38c40e2b0b6c7808e (patch) | |
| tree | 3ae08fb9d199813840564fb392ebc9b4a5d8c230 /include/linux/regmap.h | |
| parent | c86845dc7b56be050b9e53b31079e8bd0a3dc279 (diff) | |
| download | lwn-018690d33ecf4aa1eb1415e38c40e2b0b6c7808e.tar.gz lwn-018690d33ecf4aa1eb1415e38c40e2b0b6c7808e.zip | |
regmap: Allow regmap_update_bits() users to detect changes
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>
Diffstat (limited to 'include/linux/regmap.h')
| -rw-r--r-- | include/linux/regmap.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/regmap.h b/include/linux/regmap.h index 81dfe0acb20c..a83e4a097abd 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -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); |