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 <rklein@nvidia.com>.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 679734d26a1..56593b75168 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -14,6 +14,7 @@
 #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)
@@ -85,3 +86,49 @@ struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
         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);