ARM: dts: sun4i: Enable tablet keys on Chuwi V7 CW0825

Enable the lradc controlled tablet keys on the Chuwi V7 CW0825 tablet.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun4i-a10-chuwi-v7-cw0825.dts

@@ -49,6 +49,7 @@
 #include "sun4i-a10.dtsi"
 #include "sunxi-common-regulators.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 
 / {
 	model = "Chuwi V7 CW0825";
@@ -74,6 +75,32 @@
 	};
 };
 
+&lradc {
+	vref-supply = <&reg_vcc3v0>;
+	status = "okay";
+
+	button@800 {
+		label = "Volume Up";
+		linux,code = <KEY_VOLUMEUP>;
+		channel = <0>;
+		voltage = <800000>;
+	};
+
+	button@1000 {
+		label = "Volume Down";
+		linux,code = <KEY_VOLUMEDOWN>;
+		channel = <0>;
+		voltage = <1000000>;
+	};
+
+	button@1200 {
+		label = "Back";
+		linux,code = <KEY_BACK>;
+		channel = <0>;
+		voltage = <1200000>;
+	};
+};
+
 &mmc0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin_reference_design>;