1NXP LPC32xx Key Scan Interface
2
3This binding is based on the matrix-keymap binding with the following
4changes:
5
6Required Properties:
7- compatible: Should be "nxp,lpc3220-key"
8- reg: Physical base address of the controller and length of memory mapped
9  region.
10- interrupts: The interrupt number to the cpu.
11- clocks: phandle to clock controller plus clock-specifier pair
12- nxp,debounce-delay-ms: Debounce delay in ms
13- nxp,scan-delay-ms: Repeated scan period in ms
14- linux,keymap: the key-code to be reported when the key is pressed
15  and released, see also
16  Documentation/devicetree/bindings/input/matrix-keymap.txt
17
18Note: keypad,num-rows and keypad,num-columns are required, and must be equal
19since LPC32xx only supports square matrices
20
21Example:
22
23	key@40050000 {
24		compatible = "nxp,lpc3220-key";
25		reg = <0x40050000 0x1000>;
26		clocks = <&clk LPC32XX_CLK_KEY>;
27		interrupt-parent = <&sic1>;
28		interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;
29		keypad,num-rows = <1>;
30		keypad,num-columns = <1>;
31		nxp,debounce-delay-ms = <3>;
32		nxp,scan-delay-ms = <34>;
33		linux,keymap = <0x00000002>;
34	};
35