linux-kernel - [PATCH 3/5] regmap: Allow drivers to control cache

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Date:	Mon, 19 Sep 2011 19:03:42 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 3/5] regmap: Allow drivers to control cache_only flag

Signed-off-by: Mark Brown <broonie@...nsource.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

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