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-rw-r--r--drivers/base/regmap/regmap.c33
-rw-r--r--include/linux/regmap.h2
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index add5da6d9c0a..be10a4ff6609 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -259,6 +259,39 @@ 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 a83e4a097abd..cfce3a358fbf 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -128,6 +128,8 @@ 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);