regulator: core: Add helper to put of_nodes from matches

As of_regulator_match will take an of_node reference to each matched
regulator, it makes sense to provide a helper to put all those
references. This patch does that.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/of_regulator.c

@@ -172,3 +172,24 @@ int of_regulator_match(struct device *dev, struct device_node *node,
 	return count;
 }
 EXPORT_SYMBOL_GPL(of_regulator_match);
+
+/**
+ * of_regulator_put_match - put the of_node references from an
+ *                          of_regulator_match structure
+ * @matches: match table for the regulators
+ * @num_matches: number of entries in match table
+ *
+ * This function goes through a match table and calls of_node_put on each
+ * of_node.
+ */
+int of_regulator_put_match(struct of_regulator_match *matches,
+			   unsigned int num_matches)
+{
+	int i;
+
+	for (i = 0; i < num_matches; i++)
+		of_node_put(matches[i].of_node);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_regulator_put_match);

include/linux/regulator/of_regulator.h

@@ -20,6 +20,8 @@ extern struct regulator_init_data
 extern int of_regulator_match(struct device *dev, struct device_node *node,
 			      struct of_regulator_match *matches,
 			      unsigned int num_matches);
+extern int of_regulator_put_match(struct of_regulator_match *matches,
+				  unsigned int num_matches);
 #else
 static inline struct regulator_init_data
 	*of_get_regulator_init_data(struct device *dev,
@@ -35,6 +37,11 @@ static inline int of_regulator_match(struct device *dev,
 {
 	return 0;
 }
+static inline int of_regulator_put_match(struct of_regulator_match *matches,
+					 unsigned int num_matches);
+{
+	return 0;
+}
 #endif /* CONFIG_OF */
 
 #endif /* __LINUX_OF_REG_H */