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