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diff --git a/Documentation/devicetree/bindings/input/lpc32xx-key.txt b/Documentation/devicetree/bindings/input/lpc32xx-key.txt
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+NXP LPC32xx Key Scan Interface
+
+Required Properties:
+- compatible: Should be "nxp,lpc3220-key"
+- reg: Physical base address of the controller and length of memory mapped
+  region.
+- interrupts: The interrupt number to the cpu.
+- keypad,num-rows: Number of rows and columns, e.g. 1: 1x1, 6: 6x6
+- keypad,num-columns: Must be equal to keypad,num-rows since LPC32xx only
+  supports square matrices
+- nxp,debounce-delay-ms: Debounce delay in ms
+- nxp,scan-delay-ms: Repeated scan period in ms
+- linux,keymap: the key-code to be reported when the key is pressed
+  and released, see also
+  Documentation/devicetree/bindings/input/matrix-keymap.txt
+
+Example:
+
+        key@40050000 {
+                compatible = "nxp,lpc3220-key";
+                reg = <0x40050000 0x1000>;
+                interrupts = <54 0>;
+                keypad,num-rows = <1>;
+                keypad,num-columns = <1>;
+                nxp,debounce-delay-ms = <3>;
+                nxp,scan-delay-ms = <34>;
+                linux,keymap = <0x00000002>;
+        };