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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>
hifive-unleashed-5.1
zoro 2018-11-14 17:38:22 +08:00 committed by Mark Brown
parent 96392c3d8c
commit fe06051dbf
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 35 additions and 0 deletions
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35
drivers/regulator/core.c
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@ -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;