[PATCH 1/3] power_supply: add power_supply_get_by_phandle

[Sebastian Reichel <sre@debian.org>]

Add method to get power supply by device tree phandle.

Signed-off-by: Sebastian Reichel <sre@debian.org>
---
 drivers/power/power_supply_core.c | 24 ++++++++++++++++++++++++
 include/linux/power_supply.h      |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 08bce22..99e4b41 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -340,6 +340,30 @@ struct power_supply *power_supply_get_by_name(const char *name)
 }
 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 
+static int power_supply_match_device_node(struct device *dev, const void *data)
+{
+	return dev->parent && dev->parent->of_node == data;
+}
+
+struct power_supply *power_supply_get_by_phandle(struct device_node *np,
+							const char *property)
+{
+	struct device_node *power_supply_np;
+	struct device *dev;
+
+	power_supply_np = of_parse_phandle(np, property, 0);
+	if (!power_supply_np)
+		return ERR_PTR(-ENODEV);
+
+	dev = class_find_device(power_supply_class, NULL, power_supply_np,
+						power_supply_match_device_node);
+
+	of_node_put(power_supply_np);
+
+	return dev ? dev_get_drvdata(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
+
 int power_supply_powers(struct power_supply *psy, struct device *dev)
 {
 	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index c6f52c0..4d0e0b4 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -246,6 +246,8 @@ extern struct atomic_notifier_head    power_supply_notifier;
 extern int power_supply_reg_notifier(struct notifier_block *nb);
 extern void power_supply_unreg_notifier(struct notifier_block *nb);
 extern struct power_supply *power_supply_get_by_name(const char *name);
+extern struct power_supply *power_supply_get_by_phandle(struct device_node *np,
+							const char *property);
 extern void power_supply_changed(struct power_supply *psy);
 extern int power_supply_am_i_supplied(struct power_supply *psy);
 extern int power_supply_set_battery_charged(struct power_supply *psy);
-- 
1.8.4.3