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-Allwinner sun4i low res adc attached tablet keys
-------------------------------------------------
-
-Required properties:
- - compatible: should be one of the following string:
- "allwinner,sun4i-a10-lradc-keys"
- "allwinner,sun8i-a83t-r-lradc"
- - reg: mmio address range of the chip
- - interrupts: interrupt to which the chip is connected
- - vref-supply: powersupply for the lradc reference voltage
-
-Each key is represented as a sub-node of the compatible mentioned above:
-
-Required subnode-properties:
- - label: Descriptive name of the key.
- - linux,code: Keycode to emit.
- - channel: Channel this key is attached to, must be 0 or 1.
- - voltage: Voltage in µV at lradc input when this key is pressed.
-
-Example:
-
-#include <dt-bindings/input/input.h>
-
- lradc: lradc@1c22800 {
- compatible = "allwinner,sun4i-a10-lradc-keys";
- reg = <0x01c22800 0x100>;
- interrupts = <31>;
- vref-supply = <&reg_vcc3v0>;
-
- button@191 {
- label = "Volume Up";
- linux,code = <KEY_VOLUMEUP>;
- channel = <0>;
- voltage = <191274>;
- };
-
- button@392 {
- label = "Volume Down";
- linux,code = <KEY_VOLUMEDOWN>;
- channel = <0>;
- voltage = <392644>;
- };
-
- button@601 {
- label = "Menu";
- linux,code = <KEY_MENU>;
- channel = <0>;
- voltage = <601151>;
- };
-
- button@795 {
- label = "Enter";
- linux,code = <KEY_ENTER>;
- channel = <0>;
- voltage = <795090>;
- };
-
- button@987 {
- label = "Home";
- linux,code = <KEY_HOMEPAGE>;
- channel = <0>;
- voltage = <987387>;
- };
- };