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>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index bebda1481f23..86923a98a766 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);