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Subject[PATCH v2 1/5] regulator: Add of_get_regulator_from_list
Date
of_get_regulator_from_list() permits to get a regulator from a
regulators list.
Then add support for such list in of_get_regulator()

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
drivers/regulator/core.c | 44 ++++++++++++++++++++++++++++++++++++----
1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 1e54a833f2cf..09578c3595de 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -351,6 +351,33 @@ static void regulator_lock_dependent(struct regulator_dev *rdev,
mutex_unlock(&regulator_list_mutex);
}

+/**
+ * of_get_regulator_from_list - get a regulator device node based on supply name
+ * from a DT regulators list
+ * @dev: Device pointer for the consumer (of regulator) device
+ * @np: The device node where to search for regulators list
+ * @supply: regulator supply name
+ *
+ * Extract the regulator device node corresponding to the supply name.
+ * returns the device node corresponding to the regulator if found, else
+ * returns NULL.
+ */
+static struct device_node *of_get_regulator_from_list(struct device *dev,
+ struct device_node *np,
+ const char *supply)
+{
+ struct of_phandle_args regspec;
+ int index, ret;
+
+ index = of_property_match_string(np, "regulator-names", supply);
+ if (index >= 0) {
+ ret = of_parse_phandle_with_args(np, "regulators", NULL, index, &regspec);
+ if (ret == 0)
+ return regspec.np;
+ }
+ return NULL;
+}
+
/**
* of_get_child_regulator - get a child regulator device node
* based on supply name
@@ -362,17 +389,23 @@ static void regulator_lock_dependent(struct regulator_dev *rdev,
* returns the device node corresponding to the regulator if found, else
* returns NULL.
*/
-static struct device_node *of_get_child_regulator(struct device_node *parent,
- const char *prop_name)
+static struct device_node *of_get_child_regulator(struct device *dev,
+ struct device_node *parent,
+ const char *supply)
{
struct device_node *regnode = NULL;
struct device_node *child = NULL;
+ char prop_name[64]; /* 64 is max size of property name */

+ snprintf(prop_name, 64, "%s-supply", supply);
for_each_child_of_node(parent, child) {
+ regnode = of_get_regulator_from_list(dev, child, supply);
+ if (regnode)
+ return regnode;
regnode = of_parse_phandle(child, prop_name, 0);

if (!regnode) {
- regnode = of_get_child_regulator(child, prop_name);
+ regnode = of_get_child_regulator(dev, child, prop_name);
if (regnode)
goto err_node_put;
} else {
@@ -401,12 +434,15 @@ static struct device_node *of_get_regulator(struct device *dev, const char *supp
char prop_name[64]; /* 64 is max size of property name */

dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
+ regnode = of_get_regulator_from_list(dev, dev->of_node, supply);
+ if (regnode)
+ return regnode;

snprintf(prop_name, 64, "%s-supply", supply);
regnode = of_parse_phandle(dev->of_node, prop_name, 0);

if (!regnode) {
- regnode = of_get_child_regulator(dev->of_node, prop_name);
+ regnode = of_get_child_regulator(dev, dev->of_node, supply);
if (regnode)
return regnode;

--
2.35.1
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