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Documentation / devicetree / bindings / input / samsung-keypad.txt




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

1	* Samsung's Keypad Controller device tree bindings
2	
3	Samsung's Keypad controller is used to interface a SoC with a matrix-type
4	keypad device. The keypad controller supports multiple row and column lines.
5	A key can be placed at each intersection of a unique row and a unique column.
6	The keypad controller can sense a key-press and key-release and report the
7	event using a interrupt to the cpu.
8	
9	Required SoC Specific Properties:
10	- compatible: should be one of the following
11	  - "samsung,s3c6410-keypad": For controllers compatible with s3c6410 keypad
12	    controller.
13	  - "samsung,s5pv210-keypad": For controllers compatible with s5pv210 keypad
14	    controller.
15	
16	- reg: physical base address of the controller and length of memory mapped
17	  region.
18	
19	- interrupts: The interrupt number to the cpu.
20	
21	Required Board Specific Properties:
22	- samsung,keypad-num-rows: Number of row lines connected to the keypad
23	  controller.
24	
25	- samsung,keypad-num-columns: Number of column lines connected to the
26	  keypad controller.
27	
28	- row-gpios: List of gpios used as row lines. The gpio specifier for
29	  this property depends on the gpio controller to which these row lines
30	  are connected.
31	
32	- col-gpios: List of gpios used as column lines. The gpio specifier for
33	  this property depends on the gpio controller to which these column
34	  lines are connected.
35	
36	- Keys represented as child nodes: Each key connected to the keypad
37	  controller is represented as a child node to the keypad controller
38	  device node and should include the following properties.
39	  - keypad,row: the row number to which the key is connected.
40	  - keypad,column: the column number to which the key is connected.
41	  - linux,code: the key-code to be reported when the key is pressed
42	    and released.
43	
44	Optional Properties specific to linux:
45	- linux,keypad-no-autorepeat: do no enable autorepeat feature.
46	- linux,keypad-wakeup: use any event on keypad as wakeup event.
47	
48	
49	Example:
50		keypad@100A0000 {
51			compatible = "samsung,s5pv210-keypad";
52			reg = <0x100A0000 0x100>;
53			interrupts = <173>;
54			samsung,keypad-num-rows = <2>;
55			samsung,keypad-num-columns = <8>;
56			linux,input-no-autorepeat;
57			linux,input-wakeup;
58	
59			row-gpios = <&gpx2 0 3 3 0
60				     &gpx2 1 3 3 0>;
61	
62			col-gpios = <&gpx1 0 3 0 0
63				     &gpx1 1 3 0 0
64				     &gpx1 2 3 0 0
65				     &gpx1 3 3 0 0
66				     &gpx1 4 3 0 0
67				     &gpx1 5 3 0 0
68				     &gpx1 6 3 0 0
69				     &gpx1 7 3 0 0>;
70	
71			key_1 {
72				keypad,row = <0>;
73				keypad,column = <3>;
74				linux,code = <2>;
75			};
76	
77			key_2 {
78				keypad,row = <0>;
79				keypad,column = <4>;
80				linux,code = <3>;
81			};
82	
83			key_3 {
84				keypad,row = <0>;
85				keypad,column = <5>;
86				linux,code = <4>;
87			};
88		};
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