regulator/of_get_regulator: add child path to find the regulator supplier

when the VIR_LDO1 regulator supplier is it's brother,
we can't find the supplier.

example code :
&vir_regulator {
	ldo0_vir: ldo0-virtual {
		regulator-compatible = "VIR_LDO0";
		regulator-name= "VIR_LDO0";
		regulator-min-microvolt = <1000000>;
		regulator-max-microvolt = <2000000>;
	};
	ldo1_vir: ldo1-virtual {
		regulator-compatible = "VIR_LDO1";
		regulator-name= "VIR_LDO1";
		regulator-min-microvolt = <1000000>;
		regulator-max-microvolt = <3000000>;
		ldo1-supply = <&ldo0_vir>;
	};
	...
}

so we add the child ptah to find the suppier.

Signed-off-by: zoro <long17.cool@163.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 2c66b528aedec02f4afdda7e8c04faf60711a70d..55207264c212b984412d4ef5c3213edeab7345cb 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -227,6 +227,37 @@ static void regulator_unlock_supply(struct regulator_dev *rdev)
        }
 }
 
+/**
+ * of_get_child_regulator - get a child regulator device node
+ * based on supply name
+ * @parent: Parent device node
+ * @prop_name: Combination regulator supply name and "-supply"
+ *
+ * Traverse all child nodes.
+ * Extract the child 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_child_regulator(struct device_node *parent,
+                                                 const char *prop_name)
+{
+       struct device_node *regnode = NULL;
+       struct device_node *child = NULL;
+
+       for_each_child_of_node(parent, child) {
+               regnode = of_parse_phandle(child, prop_name, 0);
+
+               if (!regnode) {
+                       regnode = of_get_child_regulator(child, prop_name);
+                       if (regnode)
+                               return regnode;
+               } else {
+                       return regnode;
+               }
+       }
+       return NULL;
+}
+
 /**
  * of_get_regulator - get a regulator device node based on supply name
  * @dev: Device pointer for the consumer (of regulator) device
@@ -247,6 +278,10 @@ static struct device_node *of_get_regulator(struct device *dev, const char *supp
        regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 
        if (!regnode) {
+               regnode = of_get_child_regulator(dev->of_node, prop_name);
+               if (regnode)
+                       return regnode;
+
                dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
                                prop_name, dev->of_node);
                return NULL;