linux/Documentation/devicetree/bindings/power_supply/power_supply.txt

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Power Supply Core Support
Optional Properties:
- power-supplies : This property is added to a supply in order to list the
devices which supply it power, referenced by their phandles.
Example:
usb-charger: power@e {
compatible = "some,usb-charger";
...
};
ac-charger: power@c {
compatible = "some,ac-charger";
...
};
battery@b {
compatible = "some,battery";
...
power-supplies = <&usb-charger>, <&ac-charger>;
};