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Documentation / devicetree / bindings / input / gpio-matrix-keypad.txt




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Based on kernel version 3.9. Page generated on 2013-05-02 22:58 EST.

1	* GPIO driven matrix keypad device tree bindings
2	
3	GPIO driven matrix keypad is used to interface a SoC with a matrix keypad.
4	The matrix keypad supports multiple row and column lines, a key can be
5	placed at each intersection of a unique row and a unique column. The matrix
6	keypad can sense a key-press and key-release by means of GPIO lines and
7	report the event using GPIO interrupts to the cpu.
8	
9	Required Properties:
10	- compatible:		Should be "gpio-matrix-keypad"
11	- row-gpios:		List of gpios used as row lines. The gpio specifier
12				for this property depends on the gpio controller to
13				which these row lines are connected.
14	- col-gpios:		List of gpios used as column lines. The gpio specifier
15				for this property depends on the gpio controller to
16				which these column lines are connected.
17	- linux,keymap:		The definition can be found at
18				bindings/input/matrix-keymap.txt
19	
20	Optional Properties:
21	- linux,no-autorepeat:	do no enable autorepeat feature.
22	- linux,wakeup:		use any event on keypad as wakeup event.
23	- debounce-delay-ms:	debounce interval in milliseconds
24	- col-scan-delay-us:	delay, measured in microseconds, that is needed
25				before we can scan keypad after activating column gpio
26	
27	Example:
28		matrix-keypad {
29			compatible = "gpio-matrix-keypad";
30			debounce-delay-ms = <5>;
31			col-scan-delay-us = <2>;
32	
33			row-gpios = <&gpio2 25 0
34				     &gpio2 26 0
35				     &gpio2 27 0>;
36	
37			col-gpios = <&gpio2 21 0
38				     &gpio2 22 0>;
39	
40			linux,keymap = <0x0000008B
41					0x0100009E
42					0x02000069
43					0x0001006A
44					0x0101001C
45					0x0201006C>;
46		};
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