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-rw-r--r--drivers/base/regmap/regmap.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 6db77d8e45..4ae399c30f 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2837,6 +2837,43 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
EXPORT_SYMBOL_GPL(regmap_read);
/**
+ * regmap_read_bypassed() - Read a value from a single register direct
+ * from the device, bypassing the cache
+ *
+ * @map: Register map to read from
+ * @reg: Register to be read from
+ * @val: Pointer to store read value
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_read_bypassed(struct regmap *map, unsigned int reg, unsigned int *val)
+{
+ int ret;
+ bool bypass, cache_only;
+
+ if (!IS_ALIGNED(reg, map->reg_stride))
+ return -EINVAL;
+
+ map->lock(map->lock_arg);
+
+ bypass = map->cache_bypass;
+ cache_only = map->cache_only;
+ map->cache_bypass = true;
+ map->cache_only = false;
+
+ ret = _regmap_read(map, reg, val);
+
+ map->cache_bypass = bypass;
+ map->cache_only = cache_only;
+
+ map->unlock(map->lock_arg);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_read_bypassed);
+
+/**
* regmap_raw_read() - Read raw data from the device
*
* @map: Register map to read from