Merge branch 'topic/cache' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...

[~andy/linux] / drivers / base / regmap / regmap.c

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index add5da6d9c0aa00c90ce666f23e39a21bb798f2d..be10a4ff660915625454375ce9fb30a97d5b7ef9 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -258,6 +258,39 @@ 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
  */