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, mut 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@01c22800 {
23		compatible = "allwinner,sun4i-a10-lradc-keys";
24		reg = <0x01c22800 0x100>;
25		interrupts = <31>;
26		vref-supply = <&reg_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	};
63