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diff --git a/Documentation/devicetree/bindings/serio/olpc,ap-sp.txt b/Documentation/devicetree/bindings/serio/olpc,ap-sp.txt
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+++ b/Documentation/devicetree/bindings/serio/olpc,ap-sp.txt
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+OLPC AP-SP serio interface
+
+Required properties:
+- compatible : "olpc,ap-sp"
+- reg : base address and length of SoC's WTM registers
+- interrupts : SP-AP interrupt
+
+Example:
+        ap-sp@d4290000 {
+                compatible = "olpc,ap-sp";
+                reg = <0xd4290000 0x1000>;
+                interrupts = <40>;
+        }