regmap: Add regmap_get_device

Add a new function regmap_get_device to obtain the underlying struct
device from a regmap.

Signed-off-by: Tuomas Tynkkynen <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/base/regmap/regmap.c

···
 }
 EXPORT_SYMBOL_GPL(dev_get_regmap);
 
+/**
+ * regmap_get_device(): Obtain the device from a regmap
+ *
+ * @map: Register map to operate on.
+ *
+ * Returns the underlying device that the regmap has been created for.
+ */
+struct device *regmap_get_device(struct regmap *map)
+{
+	return map->dev;
+}
+
 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
 			       struct regmap_range_node *range,
 			       unsigned int val_num)

include/linux/regmap.h

···
 int regmap_reinit_cache(struct regmap *map,
 			const struct regmap_config *config);
 struct regmap *dev_get_regmap(struct device *dev, const char *name);
+struct device *regmap_get_device(struct regmap *map);
 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
 int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val);
 int regmap_raw_write(struct regmap *map, unsigned int reg,
···
 					    const char *name)
 {
 	return NULL;
+}
+
+static inline struct device *regmap_get_device(struct regmap *map)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return -EINVAL;
 }
 
 #endif