linux-kernel - [PATCH] regulator/of_get_regulator: add child path to find the regulator supplier

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Message-Id: <1541655635-11574-1-git-send-email-long17.cool@163.com>
Date:   Thu,  8 Nov 2018 13:40:35 +0800
From:   zoro <long17.cool@....com>
To:     lgirdwood@...il.com
Cc:     broonie@...nel.org, linux-kernel@...r.kernel.org,
        zoro <long17.cool@....com>
Subject: [PATCH] regulator/of_get_regulator: add child path to find the regulator 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>;
            };
            ...
        };

when the VIR_LDO1 regulator supplier is it's brother,
we can't find the supplier.
so we add the child ptah to find the suppier.

Signed-off-by: zoro <long17.cool@....com>
---
 drivers/regulator/core.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 2c66b52..5dbfdba 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -239,6 +239,7 @@ static void regulator_unlock_supply(struct regulator_dev *rdev)
 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 {
 	struct device_node *regnode = NULL;
+	struct device_node *child = NULL;
 	char prop_name[32]; /* 32 is max size of property name */
 
 	dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
@@ -247,6 +248,11 @@ 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) {
+		for_each_child_of_node(dev->of_node, child) {
+			regnode = of_parse_phandle(child, prop_name, 0);
+			if (regnode)
+				return regnode;
+		}
 		dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
 				prop_name, dev->of_node);
 		return NULL;
-- 
1.7.9.5