FAILED: patch "[PATCH] power: supply: core: Honor supplied-from with CONFIG_OF=y" failed to apply to 6.12-stable tree

FAILED: patch "[PATCH] power: supply: core: Honor supplied-from with CONFIG_OF=y" failed to apply to 6.12-stable tree

[Sasha Levin]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 6bd80f22c764fe8c56c62c118387f86a3ca98cff
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107051904-failed-6.12-6bd80f22c764@kernel.org' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 6bd80f22c764fe8c56c62c118387f86a3ca98cff Mon Sep 17 00:00:00 2001
From: Maurizio Casciano <mauriziocasciano7@gmail.com>
Date: Fri, 25 Sep 2026 00:51:52 +0200
Subject: [PATCH] power: supply: core: Honor supplied-from with CONFIG_OF=y

The supplied-from device property is the name-based counterpart to
firmware-node power-supplies references. It was added for non-DT platforms,
but its parser is compiled only when CONFIG_OF is disabled. CONFIG_OF is
a global kernel option, so x86 systems commonly enable it even when
individual power supplies are described by software nodes.

Consequently, these consumers never populate supplied_from and supplier
notifications do not reach their external_power_changed() callbacks. On a
Lenovo Yoga Book YB1-X91L, ftrace showed the Whiskey Cove supplier
notification running without invoking the BQ25892 callback, leaving the
input current limit at its boot-time value.

Use a single power_supply_check_supplies() implementation for all
configurations. Preserve firmware-node power-supplies references as the
preferred firmware description and use the name-based supplied-from
property only when no references are specified. Continue to honor an
explicitly provided supplied_from list first and propagate errors from
specified firmware references.

With the fix, ftrace shows the BQ25892 callback on hotplug. A boot-offline
test changes its input current limit from 500 mA to 2 A.

Fixes: 58a36bb06891 ("power: supply: core: Add support for supplied-from device-property")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Maurizio Casciano <mauriziocasciano7@gmail.com>
Link: https://patch.msgid.link/20260924225152.985489-1-mauriziocasciano7@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/power/supply/power_supply_core.c | 84 ++++++++++++------------
 1 file changed, 42 insertions(+), 42 deletions(-)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 00d8bc98d5887..c097601ac5491 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -190,7 +190,35 @@ static void power_supply_deferred_register_work(struct work_struct *work)
 		device_unlock(psy->dev.parent);
 }
 
-#ifdef CONFIG_OF
+static int power_supply_check_supplies_by_name(struct power_supply *psy)
+{
+	struct device *parent = psy->dev.parent;
+	int nval, ret;
+
+	if (!parent)
+		return 0;
+
+	nval = device_property_string_array_count(parent, "supplied-from");
+	if (nval <= 0)
+		return 0;
+
+	psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
+						sizeof(*psy->supplied_from),
+						GFP_KERNEL);
+	if (!psy->supplied_from)
+		return -ENOMEM;
+
+	ret = device_property_read_string_array(parent, "supplied-from",
+						(const char **)psy->supplied_from,
+						nval);
+	if (ret < 0)
+		return ret;
+
+	psy->num_supplies = nval;
+
+	return 0;
+}
+
 static int __power_supply_populate_supplied_from(struct power_supply *epsy,
 						 void *data)
 {
@@ -262,22 +290,21 @@ static int power_supply_find_supply_from_fwnode(struct fwnode_handle *supply_nod
 static int power_supply_check_supplies(struct power_supply *psy)
 {
 	struct fwnode_handle *np;
-	int cnt = 0;
+	int cnt, ret;
 
 	/* If there is already a list honor it */
 	if (psy->supplied_from && psy->num_supplies > 0)
 		return 0;
 
-	/* No device node found, nothing to do */
-	if (!psy->dev.fwnode)
-		return 0;
-
-	do {
-		int ret;
+	for (cnt = 0; psy->dev.fwnode; cnt++) {
+		np = fwnode_find_reference(psy->dev.fwnode, "power-supplies", cnt);
+		if (IS_ERR(np)) {
+			ret = PTR_ERR(np);
+			if (ret != -ENOENT)
+				return ret;
 
-		np = fwnode_find_reference(psy->dev.fwnode, "power-supplies", cnt++);
-		if (IS_ERR(np))
 			break;
+		}
 
 		ret = power_supply_find_supply_from_fwnode(np);
 		fwnode_handle_put(np);
@@ -286,48 +313,21 @@ static int power_supply_check_supplies(struct power_supply *psy)
 			dev_dbg(&psy->dev, "Failed to find supply!\n");
 			return ret;
 		}
-	} while (!IS_ERR(np));
+	}
 
-	/* Missing valid "power-supplies" entries */
-	if (cnt == 1)
-		return 0;
+	/* Fall back to the name-based property if no references were specified. */
+	if (!cnt)
+		return power_supply_check_supplies_by_name(psy);
 
 	/* All supplies found, allocate char * array for filling */
 	psy->supplied_from = devm_kcalloc(&psy->dev,
-					  cnt - 1, sizeof(*psy->supplied_from),
+					  cnt, sizeof(*psy->supplied_from),
 					  GFP_KERNEL);
 	if (!psy->supplied_from)
 		return -ENOMEM;
 
 	return power_supply_populate_supplied_from(psy);
 }
-#else
-static int power_supply_check_supplies(struct power_supply *psy)
-{
-	int nval, ret;
-
-	if (!psy->dev.parent)
-		return 0;
-
-	nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
-	if (nval <= 0)
-		return 0;
-
-	psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
-						sizeof(char *), GFP_KERNEL);
-	if (!psy->supplied_from)
-		return -ENOMEM;
-
-	ret = device_property_read_string_array(psy->dev.parent,
-		"supplied-from", (const char **)psy->supplied_from, nval);
-	if (ret < 0)
-		return ret;
-
-	psy->num_supplies = nval;
-
-	return 0;
-}
-#endif
 
 struct psy_am_i_supplied_data {
 	struct power_supply *psy;
-- 
2.53.0

[PATCH 6.12.y 1/4] power: supply: core: introduce power_supply_for_each_psy()

[Sasha Levin]

From: Thomas Weißschuh <linux@weissschuh.net>

[ Upstream commit 9029409d1a250da19f1086ab1113752411c5163d ]

All existing callers of power_supply_for_each_device() want to iterate
over 'struct power_supply', not 'struct device'.
The power_supply_for_each_device() forces each caller to duplicate the
logic to go from one to the other.
Introduce power_supply_for_each_psy() to simplify the callers.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241210-power-supply-dev_to_psy-v2-2-9d8c9d24cfe4@weissschuh.net
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Stable-dep-of: 6bd80f22c764 ("power: supply: core: Honor supplied-from with CONFIG_OF=y")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/power_supply_core.c | 24 ++++++++++++++++++++++++
 include/linux/power_supply.h             |  1 +
 2 files changed, 25 insertions(+)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index edc7b3bd9b5c8..34aca2c76cc5d 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -122,6 +122,30 @@ int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void
 }
 EXPORT_SYMBOL_GPL(power_supply_for_each_device);
 
+struct psy_for_each_psy_cb_data {
+	int (*fn)(struct power_supply *psy, void *data);
+	void *data;
+};
+
+static int psy_for_each_psy_cb(struct device *dev, void *data)
+{
+	struct psy_for_each_psy_cb_data *cb_data = data;
+	struct power_supply *psy = dev_get_drvdata(dev);
+
+	return cb_data->fn(psy, cb_data->data);
+}
+
+int power_supply_for_each_psy(void *data, int (*fn)(struct power_supply *psy, void *data))
+{
+	struct psy_for_each_psy_cb_data cb_data = {
+		.fn = fn,
+		.data = data,
+	};
+
+	return power_supply_for_each_device(&cb_data, psy_for_each_psy_cb);
+}
+EXPORT_SYMBOL_GPL(power_supply_for_each_psy);
+
 void power_supply_changed(struct power_supply *psy)
 {
 	unsigned long flags;
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index b03991a29a65e..565a40172cc30 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -890,6 +890,7 @@ extern int power_supply_powers(struct power_supply *psy, struct device *dev);
 
 extern void *power_supply_get_drvdata(struct power_supply *psy);
 extern int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void *data));
+extern int power_supply_for_each_psy(void *data, int (*fn)(struct power_supply *psy, void *data));
 
 static inline bool power_supply_is_amp_property(enum power_supply_property psp)
 {
-- 
2.53.0

[PATCH 6.12.y 2/4] power: supply: core: use power_supply_for_each_psy()

[Sasha Levin]

From: Thomas Weißschuh <linux@weissschuh.net>

[ Upstream commit 68abaf7323ae857db7ec56a174b7bbf5fc687d47 ]

Simplify the callbacks by removing the need to convert a 'struct device'
into a 'struct power_supply'.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241210-power-supply-dev_to_psy-v2-3-9d8c9d24cfe4@weissschuh.net
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Stable-dep-of: 6bd80f22c764 ("power: supply: core: Honor supplied-from with CONFIG_OF=y")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/power_supply_core.c | 36 ++++++++++--------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 34aca2c76cc5d..252930b54138d 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -66,10 +66,9 @@ static bool __power_supply_is_supplied_by(struct power_supply *supplier,
 	return false;
 }
 
-static int __power_supply_changed_work(struct device *dev, void *data)
+static int __power_supply_changed_work(struct power_supply *pst, void *data)
 {
 	struct power_supply *psy = data;
-	struct power_supply *pst = dev_get_drvdata(dev);
 
 	if (__power_supply_is_supplied_by(psy, pst)) {
 		if (pst->desc->external_power_changed)
@@ -98,7 +97,7 @@ static void power_supply_changed_work(struct work_struct *work)
 	if (likely(psy->changed)) {
 		psy->changed = false;
 		spin_unlock_irqrestore(&psy->changed_lock, flags);
-		power_supply_for_each_device(psy, __power_supply_changed_work);
+		power_supply_for_each_psy(psy, __power_supply_changed_work);
 		power_supply_update_leds(psy);
 		blocking_notifier_call_chain(&power_supply_notifier,
 				PSY_EVENT_PROP_CHANGED, psy);
@@ -190,11 +189,10 @@ static void power_supply_deferred_register_work(struct work_struct *work)
 }
 
 #ifdef CONFIG_OF
-static int __power_supply_populate_supplied_from(struct device *dev,
+static int __power_supply_populate_supplied_from(struct power_supply *epsy,
 						 void *data)
 {
 	struct power_supply *psy = data;
-	struct power_supply *epsy = dev_get_drvdata(dev);
 	struct device_node *np;
 	int i = 0;
 
@@ -221,20 +219,19 @@ static int power_supply_populate_supplied_from(struct power_supply *psy)
 {
 	int error;
 
-	error = power_supply_for_each_device(psy, __power_supply_populate_supplied_from);
+	error = power_supply_for_each_psy(psy, __power_supply_populate_supplied_from);
 
 	dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 
 	return error;
 }
 
-static int  __power_supply_find_supply_from_node(struct device *dev,
+static int  __power_supply_find_supply_from_node(struct power_supply *epsy,
 						 void *data)
 {
 	struct device_node *np = data;
-	struct power_supply *epsy = dev_get_drvdata(dev);
 
-	/* returning non-zero breaks out of power_supply_for_each_device loop */
+	/* returning non-zero breaks out of power_supply_for_each_psy loop */
 	if (epsy->of_node == np)
 		return 1;
 
@@ -246,16 +243,16 @@ static int power_supply_find_supply_from_node(struct device_node *supply_node)
 	int error;
 
 	/*
-	 * power_supply_for_each_device() either returns its own errors or values
+	 * power_supply_for_each_psy() either returns its own errors or values
 	 * returned by __power_supply_find_supply_from_node().
 	 *
 	 * __power_supply_find_supply_from_node() will return 0 (no match)
 	 * or 1 (match).
 	 *
-	 * We return 0 if power_supply_for_each_device() returned 1, -EPROBE_DEFER if
+	 * We return 0 if power_supply_for_each_psy() returned 1, -EPROBE_DEFER if
 	 * it returned 0, or error as returned by it.
 	 */
-	error = power_supply_for_each_device(supply_node, __power_supply_find_supply_from_node);
+	error = power_supply_for_each_psy(supply_node, __power_supply_find_supply_from_node);
 
 	return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 }
@@ -335,10 +332,9 @@ struct psy_am_i_supplied_data {
 	unsigned int count;
 };
 
-static int __power_supply_am_i_supplied(struct device *dev, void *_data)
+static int __power_supply_am_i_supplied(struct power_supply *epsy, void *_data)
 {
 	union power_supply_propval ret = {0,};
-	struct power_supply *epsy = dev_get_drvdata(dev);
 	struct psy_am_i_supplied_data *data = _data;
 
 	if (__power_supply_is_supplied_by(epsy, data->psy)) {
@@ -356,7 +352,7 @@ int power_supply_am_i_supplied(struct power_supply *psy)
 	struct psy_am_i_supplied_data data = { psy, 0 };
 	int error;
 
-	error = power_supply_for_each_device(&data, __power_supply_am_i_supplied);
+	error = power_supply_for_each_psy(&data, __power_supply_am_i_supplied);
 
 	dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 
@@ -367,10 +363,9 @@ int power_supply_am_i_supplied(struct power_supply *psy)
 }
 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 
-static int __power_supply_is_system_supplied(struct device *dev, void *data)
+static int __power_supply_is_system_supplied(struct power_supply *psy, void *data)
 {
 	union power_supply_propval ret = {0,};
-	struct power_supply *psy = dev_get_drvdata(dev);
 	unsigned int *count = data;
 
 	if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
@@ -391,7 +386,7 @@ int power_supply_is_system_supplied(void)
 	int error;
 	unsigned int count = 0;
 
-	error = power_supply_for_each_device(&count, __power_supply_is_system_supplied);
+	error = power_supply_for_each_psy(&count, __power_supply_is_system_supplied);
 
 	/*
 	 * If no system scope power class device was found at all, most probably we
@@ -410,9 +405,8 @@ struct psy_get_supplier_prop_data {
 	union power_supply_propval *val;
 };
 
-static int __power_supply_get_supplier_property(struct device *dev, void *_data)
+static int __power_supply_get_supplier_property(struct power_supply *epsy, void *_data)
 {
-	struct power_supply *epsy = dev_get_drvdata(dev);
 	struct psy_get_supplier_prop_data *data = _data;
 
 	if (__power_supply_is_supplied_by(epsy, data->psy))
@@ -437,7 +431,7 @@ int power_supply_get_property_from_supplier(struct power_supply *psy,
 	 * This function is not intended for use with a supply with multiple
 	 * suppliers, we simply pick the first supply to report the psp.
 	 */
-	ret = power_supply_for_each_device(&data, __power_supply_get_supplier_property);
+	ret = power_supply_for_each_psy(&data, __power_supply_get_supplier_property);
 	if (ret < 0)
 		return ret;
 	if (ret == 0)
-- 
2.53.0

[PATCH 6.12.y 3/4] power: supply: core: get rid of of_node

[Sasha Levin]

From: Sebastian Reichel <sebastian.reichel@collabora.com>

[ Upstream commit 134254038739a6c6ecb7548a2f895d89a0dc9d2a ]

This removes .of_node from 'struct power_supply', since there
is already a copy in .dev.of_node and there is no need to have
two copies.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250225-psy-core-convert-to-fwnode-v1-1-d5e4369936bb@collabora.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Stable-dep-of: 6bd80f22c764 ("power: supply: core: Honor supplied-from with CONFIG_OF=y")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/power_supply_core.c | 17 ++++++++---------
 include/linux/power_supply.h             |  1 -
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 252930b54138d..3d4856ae2e798 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -197,11 +197,11 @@ static int __power_supply_populate_supplied_from(struct power_supply *epsy,
 	int i = 0;
 
 	do {
-		np = of_parse_phandle(psy->of_node, "power-supplies", i++);
+		np = of_parse_phandle(psy->dev.of_node, "power-supplies", i++);
 		if (!np)
 			break;
 
-		if (np == epsy->of_node) {
+		if (np == epsy->dev.of_node) {
 			dev_dbg(&psy->dev, "%s: Found supply : %s\n",
 				psy->desc->name, epsy->desc->name);
 			psy->supplied_from[i-1] = (char *)epsy->desc->name;
@@ -232,7 +232,7 @@ static int  __power_supply_find_supply_from_node(struct power_supply *epsy,
 	struct device_node *np = data;
 
 	/* returning non-zero breaks out of power_supply_for_each_psy loop */
-	if (epsy->of_node == np)
+	if (epsy->dev.of_node == np)
 		return 1;
 
 	return 0;
@@ -267,13 +267,13 @@ static int power_supply_check_supplies(struct power_supply *psy)
 		return 0;
 
 	/* No device node found, nothing to do */
-	if (!psy->of_node)
+	if (!psy->dev.of_node)
 		return 0;
 
 	do {
 		int ret;
 
-		np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
+		np = of_parse_phandle(psy->dev.of_node, "power-supplies", cnt++);
 		if (!np)
 			break;
 
@@ -598,8 +598,8 @@ int power_supply_get_battery_info(struct power_supply *psy,
 	const __be32 *list;
 	u32 min_max[2];
 
-	if (psy->of_node) {
-		battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
+	if (psy->dev.of_node) {
+		battery_np = of_parse_phandle(psy->dev.of_node, "monitored-battery", 0);
 		if (!battery_np)
 			return -ENODEV;
 
@@ -1384,9 +1384,8 @@ __power_supply_register(struct device *parent,
 	if (cfg) {
 		dev->groups = cfg->attr_grp;
 		psy->drv_data = cfg->drv_data;
-		psy->of_node =
+		dev->of_node =
 			cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
-		dev->of_node = psy->of_node;
 		psy->supplied_to = cfg->supplied_to;
 		psy->num_supplicants = cfg->num_supplicants;
 	}
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 565a40172cc30..efd5f0ae397a9 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -287,7 +287,6 @@ struct power_supply {
 
 	char **supplied_from;
 	size_t num_supplies;
-	struct device_node *of_node;
 
 	/* Driver private data */
 	void *drv_data;
-- 
2.53.0

[PATCH 6.12.y 4/4] power: supply: core: Honor supplied-from with CONFIG_OF=y

[Sasha Levin]

From: Maurizio Casciano <mauriziocasciano7@gmail.com>

[ Upstream commit 6bd80f22c764fe8c56c62c118387f86a3ca98cff ]

The supplied-from device property is the name-based counterpart to
firmware-node power-supplies references. It was added for non-DT platforms,
but its parser is compiled only when CONFIG_OF is disabled. CONFIG_OF is
a global kernel option, so x86 systems commonly enable it even when
individual power supplies are described by software nodes.

Consequently, these consumers never populate supplied_from and supplier
notifications do not reach their external_power_changed() callbacks. On a
Lenovo Yoga Book YB1-X91L, ftrace showed the Whiskey Cove supplier
notification running without invoking the BQ25892 callback, leaving the
input current limit at its boot-time value.

Use a single power_supply_check_supplies() implementation for all
configurations. Preserve firmware-node power-supplies references as the
preferred firmware description and use the name-based supplied-from
property only when no references are specified. Continue to honor an
explicitly provided supplied_from list first and propagate errors from
specified firmware references.

With the fix, ftrace shows the BQ25892 callback on hotplug. A boot-offline
test changes its input current limit from 500 mA to 2 A.

Fixes: 58a36bb06891 ("power: supply: core: Add support for supplied-from device-property")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Maurizio Casciano <mauriziocasciano7@gmail.com>
Link: https://patch.msgid.link/20260924225152.985489-1-mauriziocasciano7@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
[ sashal: adapted firmware-node supplier lookup to existing device-tree APIs using of_parse_phandle_with_fixed_args() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/power_supply_core.c | 90 ++++++++++++------------
 1 file changed, 45 insertions(+), 45 deletions(-)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 3d4856ae2e798..b02a9123b30a1 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -188,7 +188,35 @@ static void power_supply_deferred_register_work(struct work_struct *work)
 		mutex_unlock(&psy->dev.parent->mutex);
 }
 
-#ifdef CONFIG_OF
+static int power_supply_check_supplies_by_name(struct power_supply *psy)
+{
+	struct device *parent = psy->dev.parent;
+	int nval, ret;
+
+	if (!parent)
+		return 0;
+
+	nval = device_property_string_array_count(parent, "supplied-from");
+	if (nval <= 0)
+		return 0;
+
+	psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
+						sizeof(*psy->supplied_from),
+						GFP_KERNEL);
+	if (!psy->supplied_from)
+		return -ENOMEM;
+
+	ret = device_property_read_string_array(parent, "supplied-from",
+						(const char **)psy->supplied_from,
+						nval);
+	if (ret < 0)
+		return ret;
+
+	psy->num_supplies = nval;
+
+	return 0;
+}
+
 static int __power_supply_populate_supplied_from(struct power_supply *epsy,
 						 void *data)
 {
@@ -259,73 +287,45 @@ static int power_supply_find_supply_from_node(struct device_node *supply_node)
 
 static int power_supply_check_supplies(struct power_supply *psy)
 {
-	struct device_node *np;
-	int cnt = 0;
+	struct of_phandle_args args;
+	int cnt, ret;
 
 	/* If there is already a list honor it */
 	if (psy->supplied_from && psy->num_supplies > 0)
 		return 0;
 
-	/* No device node found, nothing to do */
-	if (!psy->dev.of_node)
-		return 0;
-
-	do {
-		int ret;
+	for (cnt = 0; psy->dev.of_node; cnt++) {
+		ret = of_parse_phandle_with_fixed_args(psy->dev.of_node,
+						       "power-supplies", 0, cnt, &args);
+		if (ret) {
+			if (ret != -ENOENT)
+				return ret;
 
-		np = of_parse_phandle(psy->dev.of_node, "power-supplies", cnt++);
-		if (!np)
 			break;
+		}
 
-		ret = power_supply_find_supply_from_node(np);
-		of_node_put(np);
+		ret = power_supply_find_supply_from_node(args.np);
+		of_node_put(args.np);
 
 		if (ret) {
 			dev_dbg(&psy->dev, "Failed to find supply!\n");
 			return ret;
 		}
-	} while (np);
+	}
 
-	/* Missing valid "power-supplies" entries */
-	if (cnt == 1)
-		return 0;
+	/* Fall back to the name-based property if no references were specified. */
+	if (!cnt)
+		return power_supply_check_supplies_by_name(psy);
 
 	/* All supplies found, allocate char * array for filling */
 	psy->supplied_from = devm_kcalloc(&psy->dev,
-					  cnt - 1, sizeof(*psy->supplied_from),
+					  cnt, sizeof(*psy->supplied_from),
 					  GFP_KERNEL);
 	if (!psy->supplied_from)
 		return -ENOMEM;
 
 	return power_supply_populate_supplied_from(psy);
 }
-#else
-static int power_supply_check_supplies(struct power_supply *psy)
-{
-	int nval, ret;
-
-	if (!psy->dev.parent)
-		return 0;
-
-	nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
-	if (nval <= 0)
-		return 0;
-
-	psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
-						sizeof(char *), GFP_KERNEL);
-	if (!psy->supplied_from)
-		return -ENOMEM;
-
-	ret = device_property_read_string_array(psy->dev.parent,
-		"supplied-from", (const char **)psy->supplied_from, nval);
-	if (ret < 0)
-		return ret;
-
-	psy->num_supplies = nval;
-
-	return 0;
-}
-#endif
 
 struct psy_am_i_supplied_data {
 	struct power_supply *psy;
-- 
2.53.0