xref: /linux/Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt (revision 3932b9ca55b0be314a36d3e84faff3e823c081f5) 
1* Tegra keyboard controller
2The key controller has maximum 24 pins to make matrix keypad. Any pin
3can be configured as row or column. The maximum column pin can be 8
4and maximum row pins can be 16 for Tegra20/Tegra30.
5
6Required properties:
7- compatible: "nvidia,tegra20-kbc"
8- reg: Register base address of KBC.
9- interrupts: Interrupt number for the KBC.
10- nvidia,kbc-row-pins: The KBC pins which are configured as row. This is an
11  array of pin numbers which is used as rows.
12- nvidia,kbc-col-pins: The KBC pins which are configured as column. This is an
13  array of pin numbers which is used as column.
14- linux,keymap: The keymap for keys as described in the binding document
15  devicetree/bindings/input/matrix-keymap.txt.
16- clocks: Must contain one entry, for the module clock.
17  See ../clocks/clock-bindings.txt for details.
18- resets: Must contain an entry for each entry in reset-names.
19  See ../reset/reset.txt for details.
20- reset-names: Must include the following entries:
21  - kbc
22
23Optional properties, in addition to those specified by the shared
24matrix-keyboard bindings:
25
26- linux,fn-keymap: a second keymap, same specification as the
27  matrix-keyboard-controller spec but to be used when the KEY_FN modifier
28  key is pressed.
29- nvidia,debounce-delay-ms: delay in milliseconds per row scan for debouncing
30- nvidia,repeat-delay-ms: delay in milliseconds before repeat starts
31- nvidia,ghost-filter: enable ghost filtering for this device
32- nvidia,wakeup-source: configure keyboard as a wakeup source for suspend/resume
33
34Example:
35
36keyboard: keyboard {
37	compatible = "nvidia,tegra20-kbc";
38	reg = <0x7000e200 0x100>;
39	interrupts = <0 85 0x04>;
40	clocks = <&tegra_car 36>;
41	resets = <&tegra_car 36>;
42	reset-names = "kbc";
43	nvidia,ghost-filter;
44	nvidia,debounce-delay-ms = <640>;
45	nvidia,kbc-row-pins = <0 1 2>;    /* pin 0, 1, 2 as rows */
46	nvidia,kbc-col-pins = <11 12 13>; /* pin 11, 12, 13 as columns */
47	linux,keymap = <0x00000074
48			0x00010067
49			0x00020066
50			0x01010068
51			0x02000069
52			0x02010070
53			0x02020071>;
54};
55