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regmap: Allow drivers to reinitialise the register cache at runtime

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Sometimes the register map information may change in ways that drivers can
discover at runtime. For example, new revisions of a device may add new
registers. Support runtime discovery by drivers by allowing the register
cache to be reinitialised with a new function regmap_reinit_cache() which
discards the existing cache and creates a new one.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2011-12-03 17:06:20 +00:00
commit bf31517335
2 changed files with 35 additions and 0 deletions
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33
drivers/base/regmap/regmap.c
View file

@ -230,6 +230,39 @@ err:
}
EXPORT_SYMBOL_GPL(regmap_init);
/**
* regmap_reinit_cache(): Reinitialise the current register cache
*
* @map: Register map to operate on.
* @config: New configuration. Only the cache data will be used.
*
* Discard any existing register cache for the map and initialize a
* new cache. This can be used to restore the cache to defaults or to
* update the cache configuration to reflect runtime discovery of the
* hardware.
*/
int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
{
int ret;
mutex_lock(&map->lock);
regcache_exit(map);
map->max_register = config->max_register;
map->writeable_reg = config->writeable_reg;
map->readable_reg = config->readable_reg;
map->volatile_reg = config->volatile_reg;
map->precious_reg = config->precious_reg;
map->cache_type = config->cache_type;
ret = regcache_init(map, config);
mutex_unlock(&map->lock);
return ret;
}
/**
* regmap_exit(): Free a previously allocated register map
*/

2
include/linux/regmap.h
View file

@ -129,6 +129,8 @@ struct regmap *regmap_init_spi(struct spi_device *dev,
const struct regmap_config *config);
void regmap_exit(struct regmap *map);
int regmap_reinit_cache(struct regmap *map,
const struct regmap_config *config);
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
int regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len);