regulator: Add generic DT parsing for regulators

Looking up init data for regulators found on chips is a common operation
that can be handled in a generic way. The new helper function introduced
by this patch looks up the children of a given node by names specified
in a match table and fills that match table with information parsed from
the DT.

This is based on work by Rhyland Klein <[e-mail]>.

Signed-off-by: Thierry Reding <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/of_regulator.c

···
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
 
 static void of_get_regulation_constraints(struct device_node *np,
 					struct regulator_init_data **init_data)
···
 	return init_data;
 }
 EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
+
+/**
+ * of_regulator_match - extract regulator init data
+ * @dev: device requesting the data
+ * @node: parent device node of the regulators
+ * @matches: match table for the regulators
+ * @num_matches: number of entries in match table
+ *
+ * This function uses a match table specified by the regulator driver and
+ * looks up the corresponding init data in the device tree. Note that the
+ * match table is modified in place.
+ *
+ * Returns the number of matches found or a negative error code on failure.
+ */
+int of_regulator_match(struct device *dev, struct device_node *node,
+		       struct of_regulator_match *matches,
+		       unsigned int num_matches)
+{
+	unsigned int count = 0;
+	unsigned int i;
+
+	if (!dev || !node)
+		return -EINVAL;
+
+	for (i = 0; i < num_matches; i++) {
+		struct of_regulator_match *match = &matches[i];
+		struct device_node *child;
+
+		child = of_find_node_by_name(node, match->name);
+		if (!child)
+			continue;
+
+		match->init_data = of_get_regulator_init_data(dev, child);
+		if (!match->init_data) {
+			dev_err(dev, "failed to parse DT for regulator %s\n",
+				child->name);
+			return -EINVAL;
+		}
+
+		match->of_node = child;
+		count++;
+	}
+
+	return count;
+}
+EXPORT_SYMBOL_GPL(of_regulator_match);

include/linux/regulator/of_regulator.h

···
 #ifndef __LINUX_OF_REG_H
 #define __LINUX_OF_REG_H
 
+struct of_regulator_match {
+	const char *name;
+	void *driver_data;
+	struct regulator_init_data *init_data;
+	struct device_node *of_node;
+};
+
 #if defined(CONFIG_OF)
 extern struct regulator_init_data
 	*of_get_regulator_init_data(struct device *dev,
 				    struct device_node *node);
+extern int of_regulator_match(struct device *dev, struct device_node *node,
+			      struct of_regulator_match *matches,
+			      unsigned int num_matches);
 #else
 static inline struct regulator_init_data
 	*of_get_regulator_init_data(struct device *dev,
 				    struct device_node *node)
 {
 	return NULL;
+}
+
+static inline int of_regulator_match(struct device *dev,
+				     struct device_node *node,
+				     struct of_regulator_match *matches,
+				     unsigned int num_matches)
+{
+	return 0;
 }
 #endif /* CONFIG_OF */