From 9872adb6f429d2ee2a4b4b533c10cf5ed49750f3 Mon Sep 17 00:00:00 2001
From: Liang Chen <cl@rock-chips.com>
Date: Thu, 7 Sep 2017 11:06:35 +0800
Subject: [PATCH] ARM: dts: add key event for rk3126-evb

Change-Id: Id50dcb060dc505a9c938ac63daa335455eb0d741
Signed-off-by: Liang Chen <cl@rock-chips.com>
---
 arch/arm/boot/dts/rk3126-evb.dts | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/arm/boot/dts/rk3126-evb.dts b/arch/arm/boot/dts/rk3126-evb.dts
index b38d493fd738..33bdd79ab565 100644
--- a/arch/arm/boot/dts/rk3126-evb.dts
+++ b/arch/arm/boot/dts/rk3126-evb.dts
@@ -40,6 +40,7 @@
 
 /dts-v1/;
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include <dt-bindings/pwm/pwm.h>
 #include "rk3126.dtsi"
@@ -49,6 +50,26 @@
 	model = "Rockchip RK3126 Evaluation board";
 	compatible = "rockchip,rk3126";
 
+	adc-keys {
+		compatible = "adc-keys";
+		io-channels = <&saradc 2>;
+		io-channel-names = "buttons";
+		poll-interval = <100>;
+		keyup-threshold-microvolt = <3300000>;
+
+		button-up {
+			label = "Volume Up";
+			linux,code = <KEY_VOLUMEUP>;
+			press-threshold-microvolt = <0>;
+		};
+
+		button-down {
+			label = "Volume Down";
+			linux,code = <KEY_VOLUMEDOWN>;
+			press-threshold-microvolt = <1650000>;
+		};
+	};
+
 	backlight: backlight {
 		compatible = "pwm-backlight";
 		brightness-levels = <
@@ -98,6 +119,15 @@
 		};
 	};
 
+	vccadc_ref: vccadc-ref {
+		compatible = "regulator-fixed";
+		regulator-name = "SARADC_AVDD33";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+	};
+
 	vcc_sys: vcc-sys {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc_sys";
@@ -384,6 +414,11 @@
 	status = "okay";
 };
 
+&saradc {
+	status = "okay";
+	vref-supply = <&vccadc_ref>;
+};
+
 &sdmmc {
 	cap-mmc-highspeed;
 	supports-sd;