linux/Documentation/devicetree/bindings/power_supply/power_supply.txt
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   1Power Supply Core Support
   2
   3Optional Properties:
   4 - power-supplies : This property is added to a supply in order to list the
   5   devices which supply it power, referenced by their phandles.
   6
   7Example:
   8
   9        usb-charger: power@e {
  10                compatible = "some,usb-charger";
  11                ...
  12        };
  13
  14        ac-charger: power@c {
  15                compatible = "some,ac-charger";
  16                ...
  17        };
  18
  19        battery@b {
  20                compatible = "some,battery";
  21                ...
  22                power-supplies = <&usb-charger>, <&ac-charger>;
  23        };
  24