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