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- Keys represented as child nodes: Each key connected to the keypad
29  controller is represented as a child node to the keypad controller
30  device node and should include the following properties.
31  - keypad,row: the row number to which the key is connected.
32  - keypad,column: the column number to which the key is connected.
33  - linux,code: the key-code to be reported when the key is pressed
34    and released.
35
36- pinctrl-0: Should specify pin control groups used for this controller.
37- pinctrl-names: Should contain only one value - "default".
38
39Optional Properties specific to linux:
40- linux,keypad-no-autorepeat: do no enable autorepeat feature.
41- linux,keypad-wakeup: use any event on keypad as wakeup event.
42
43
44Example:
45	keypad@100A0000 {
46		compatible = "samsung,s5pv210-keypad";
47		reg = <0x100A0000 0x100>;
48		interrupts = <173>;
49		samsung,keypad-num-rows = <2>;
50		samsung,keypad-num-columns = <8>;
51		linux,input-no-autorepeat;
52		linux,input-wakeup;
53
54		pinctrl-names = "default";
55		pinctrl-0 = <&keypad_rows &keypad_columns>;
56
57		key_1 {
58			keypad,row = <0>;
59			keypad,column = <3>;
60			linux,code = <2>;
61		};
62
63		key_2 {
64			keypad,row = <0>;
65			keypad,column = <4>;
66			linux,code = <3>;
67		};
68
69		key_3 {
70			keypad,row = <0>;
71			keypad,column = <5>;
72			linux,code = <4>;
73		};
74	};
75