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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>
This commit is contained in:
Cristian Birsan 2016-08-08 18:44:21 +03:00 committed by Mark Brown
parent 29b4817d40
commit 1ea975cf1e
2 changed files with 24 additions and 0 deletions
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1
drivers/base/regmap/internal.h
View File

@ -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);

23
drivers/base/regmap/regmap.c
View File

@ -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)