diff options
author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-12-03 17:06:20 +0000 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-12-05 13:17:36 +0000 |
commit | bf315173359b2f3b8b8ccca4264815e91f30be12 (patch) | |
tree | eb922a86d595849df02c474e034c855d770abce0 | |
parent | 50b776fc71c13663eb7434f634f2b796de5c9885 (diff) | |
download | op-kernel-dev-bf315173359b2f3b8b8ccca4264815e91f30be12.zip op-kernel-dev-bf315173359b2f3b8b8ccca4264815e91f30be12.tar.gz |
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: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r-- | drivers/base/regmap/regmap.c | 33 | ||||
-rw-r--r-- | include/linux/regmap.h | 2 |
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 3aca18d..579e85b 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -231,6 +231,39 @@ 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 */ void regmap_exit(struct regmap *map) diff --git a/include/linux/regmap.h b/include/linux/regmap.h index bebda14..86923a9 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -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); |