1* Samsung's Keypad Controller device tree bindings
2
3Samsung's Keypad controller is used to interface a SoC with a matrix-type
4keypad device. The keypad controller supports multiple row and column lines.
5A key can be placed at each intersection of a unique row and a unique column.
6The keypad controller can sense a key-press and key-release and report the
7event using a interrupt to the cpu.
8
9Required 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
21Required 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
44Optional 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
49Example:
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	};
89