linux/Documentation/devicetree/bindings/serio/olpc,ap-sp.txt
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   1OLPC AP-SP serio interface
   2
   3Required properties:
   4- compatible : "olpc,ap-sp"
   5- reg : base address and length of SoC's WTM registers
   6- interrupts : SP-AP interrupt
   7
   8Example:
   9        ap-sp@d4290000 {
  10                compatible = "olpc,ap-sp";
  11                reg = <0xd4290000 0x1000>;
  12                interrupts = <40>;
  13        }
  14