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Commit bf315173 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Allow drivers to reinitialise the register cache at runtime 



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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 50b776fc

drivers/base/regmap/regmap.c

+33 −0
Original line number Diff line number Diff line
@@ -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

 */

include/linux/regmap.h

+2 −0
Original line number Diff line number Diff line
@@ -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);