[PATCH 3/5] regmap: Allow drivers to control cache_only flag

Mark Brown
2011-09-19T18:04:39Z

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
drivers/base/regmap/regcache.c | 18 ++++++++++++++++++
include/linux/regmap.h | 2 ++
2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index e0a4a0d..7806941 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -238,6 +238,24 @@ int regcache_sync(struct regmap *map)
}
EXPORT_SYMBOL_GPL(regcache_sync);

+/**
+ * regcache_cache_only: Put a register map into cache only mode
+ *
+ * @map: map to configure
+ * @cache_only: flag if changes should be written to the hardware
+ *
+ * When a register map is marked as cache only writes to the register
+ * map API will only update the register cache, they will not cause
+ * any hardware changes. This is useful for allowing portions of
+ * drivers to act as though the device were functioning as normal when
+ * it is disabled for power saving reasons.
+ */
+void regcache_cache_only(struct regmap *map, bool enable)
+{
+ map->cache_only = enable;
+}
+EXPORT_SYMBOL_GPL(regcache_cache_only);
+
bool regcache_set_val(void *base, unsigned int idx,
unsigned int val, unsigned int word_size)
{
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 63b3075..76ac255 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -141,4 +141,6 @@ int regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val);

int regcache_sync(struct regmap *map);
+void regcache_cache_only(struct regmap *map, bool enable);
+
#endif
--
1.7.6.3