linux/Documentation/devicetree/bindings/power_supply/restart-poweroff.txt
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Prefs
   1* Restart Power Off
   2
   3Buffalo Linkstation LS-XHL and LS-CHLv2, and other devices power off
   4by restarting and letting u-boot keep hold of the machine until the
   5user presses a button.
   6
   7Required Properties:
   8- compatible: Should be "restart-poweroff"
   9