ARM: dts: rv1126: 38x38 board: add adc key

Signed-off-by: Yu YongZhen <yuyz@rock-chips.com>
Change-Id: If5db303eccd4cfe1a318b1b8f86a5536a36c89e8

arch/arm/boot/dts/rv1126-38x38-v10-spi-nor.dts

@@ -6,6 +6,7 @@
 /dts-v1/;
 #include "rv1126.dtsi"
 #include "rv1126-ipc.dtsi"
+#include <dt-bindings/input/input.h>
 
 / {
 	model = "Rockchip RV1126 38x38 V10 SPI NOR DDR3 Board";
@@ -99,6 +100,20 @@
 		regulator-max-microvolt = <825000>;
 	};
 
+	adc-keys {
+		compatible = "adc-keys";
+		io-channels = <&saradc 0>;
+		io-channel-names = "buttons";
+		poll-interval = <100>;
+		keyup-threshold-microvolt = <1800000>;
+
+		esc-key {
+			label = "esc";
+			linux,code = <KEY_ESC>;
+			press-threshold-microvolt = <0>;
+		};
+	};
+
 	cam_ircut0: cam_ircut {
 		status = "okay";
 		compatible = "rockchip,ircut";
@@ -398,6 +413,11 @@
 	>;
 };
 
+&saradc {
+	status = "okay";
+	vref-supply = <&vcc_1v8>;
+};
+
 &sdmmc0_bus4 {
 	rockchip,pins =
 		/* sdmmc0_d0 */