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1Allwinner sun4i low res adc attached tablet keys
2------------------------------------------------
3
4Required properties:
5 - compatible: "allwinner,sun4i-a10-lradc-keys"
6 - reg: mmio address range of the chip
7 - interrupts: interrupt to which the chip is connected
8 - vref-supply: powersupply for the lradc reference voltage
9
10Each key is represented as a sub-node of "allwinner,sun4i-a10-lradc-keys":
11
12Required subnode-properties:
13 - label: Descriptive name of the key.
14 - linux,code: Keycode to emit.
15 - channel: Channel this key is attached to, must be 0 or 1.
16 - voltage: Voltage in µV at lradc input when this key is pressed.
17
18Example:
19
20#include <dt-bindings/input/input.h>
21
22 lradc: lradc@1c22800 {
23 compatible = "allwinner,sun4i-a10-lradc-keys";
24 reg = <0x01c22800 0x100>;
25 interrupts = <31>;
26 vref-supply = <®_vcc3v0>;
27
28 button@191 {
29 label = "Volume Up";
30 linux,code = <KEY_VOLUMEUP>;
31 channel = <0>;
32 voltage = <191274>;
33 };
34
35 button@392 {
36 label = "Volume Down";
37 linux,code = <KEY_VOLUMEDOWN>;
38 channel = <0>;
39 voltage = <392644>;
40 };
41
42 button@601 {
43 label = "Menu";
44 linux,code = <KEY_MENU>;
45 channel = <0>;
46 voltage = <601151>;
47 };
48
49 button@795 {
50 label = "Enter";
51 linux,code = <KEY_ENTER>;
52 channel = <0>;
53 voltage = <795090>;
54 };
55
56 button@987 {
57 label = "Home";
58 linux,code = <KEY_HOMEPAGE>;
59 channel = <0>;
60 voltage = <987387>;
61 };
62 };