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 <[email protected]> --- drivers/base/regmap/internal.h | 1 + drivers/base/regmap/regmap.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index a038033..f4be4c1 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 51fa7d6..1f011f9 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) -- 1.9.1
