diff options
| author | Cristian Birsan <cristian.birsan@microchip.com> | 2016-08-08 18:44:21 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-08-09 15:43:33 +0300 |
| commit | 1ea975cf1ef57b1e44c0aec4820f60bb3b60904b (patch) | |
| tree | bd316f9aa746e60842cc2cb740fbfc317bf34bc5 /drivers/base/regmap | |
| parent | 29b4817d4018df78086157ea3a55c1d9424a7cfc (diff) | |
| download | linux-1ea975cf1ef57b1e44c0aec4820f60bb3b60904b.tar.xz | |
regmap: Add a function to check if a regmap register is cached
Add a function to check if a regmap register is cached. This will be used
in debugfs to dump the cached values of write only registers.
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base/regmap')
| -rw-r--r-- | drivers/base/regmap/internal.h | 1 | ||||
| -rw-r--r-- | drivers/base/regmap/regmap.c | 23 |
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index a0380338946a..f4be4c19bb17 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -173,6 +173,7 @@ struct regcache_ops { int (*drop)(struct regmap *map, unsigned int min, unsigned int max); }; +bool regmap_cached(struct regmap *map, unsigned int reg); bool regmap_writeable(struct regmap *map, unsigned int reg); bool regmap_readable(struct regmap *map, unsigned int reg); bool regmap_volatile(struct regmap *map, unsigned int reg); diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 51fa7d66a393..1f011f9d6dcb 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -93,6 +93,29 @@ bool regmap_writeable(struct regmap *map, unsigned int reg) return true; } +bool regmap_cached(struct regmap *map, unsigned int reg) +{ + int ret; + unsigned int val; + + if (map->cache == REGCACHE_NONE) + return false; + + if (!map->cache_ops) + return false; + + if (map->max_register && reg > map->max_register) + return false; + + map->lock(map->lock_arg); + ret = regcache_read(map, reg, &val); + map->unlock(map->lock_arg); + if (ret) + return false; + + return true; +} + bool regmap_readable(struct regmap *map, unsigned int reg) { if (!map->reg_read) |