linux-kernel - [PATCH] power: supply: Propagate of

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Date:   Tue, 4 Jul 2023 09:43:29 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Sebastian Reichel <sre@...nel.org>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...s.com>, Vincent Whitchurch <vincent.whitchurch@...s.com>
Subject: [PATCH] power: supply: Propagate of_node to child device

Ensure that the dynamically created power supply device sets its
->of_node if the parent device has one.  This brings it in line with
several other subsystems (see git grep 'of_node =.*parent.*of_node') and
allows easier identification of the device from udev rules and similar.

Before this patch:

 /sys/class/power_supply# ls -l bq256xx-battery/of_node
 ls: cannot access 'bq256xx-battery/of_node': No such file or directory
 # ls -l bq256xx-battery/hwmon1/of_node
 ls: cannot access 'bq256xx-battery/hwmon1/of_node': No such file or directory

After:

 /sys/class/power_supply# ls -l bq256xx-battery/of_node
 lrwxrwxrwx 1 root root 0 May 17 09:14 bq256xx-battery/of_node ->
 ../../../../../../../../firmware/devicetree/base/virtio@...2c/bq25619@09
 # ls -l bq256xx-battery/hwmon1/of_node
 lrwxrwxrwx 1 root root 0 May 17 09:14 bq256xx-battery/hwmon1/of_node ->
 ../../../../../../../../../firmware/devicetree/base/virtio@...2c/bq25619@09

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 drivers/power/supply/power_supply_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 3791aec69ddc6..8769d82dd9c3d 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -1368,6 +1368,7 @@ __power_supply_register(struct device *parent,
 	dev->class = power_supply_class;
 	dev->type = &power_supply_dev_type;
 	dev->parent = parent;
+	dev->of_node = parent->of_node;
 	dev->release = power_supply_dev_release;
 	dev_set_drvdata(dev, psy);
 	psy->desc = desc;

---
base-commit: 6995e2de6891c724bfeb2db33d7b87775f913ad1
change-id: 20230704-power-of-4e2ab0bbe48d

Best regards,
-- 
Vincent Whitchurch <vincent.whitchurch@...s.com>