[PATCH 4/4] arm64: dts: rockchip: Add adc-keys node to Radxa E20C

[Jonas Karlman <jonas@kwiboo.se>]

Radxa E20C has two buttons, one SARADC maskrom button and one GPIO user
button.

Add support for the maskrom button using a adc-keys node, also add the
regulators used by SARADC controller.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 .../boot/dts/rockchip/rk3528-radxa-e20c.dts   | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
index d2cdb63d4a9d..dcc0b2584bbc 100644
--- a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
@@ -6,6 +6,8 @@
  */
 
 /dts-v1/;
+
+#include <dt-bindings/input/input.h>
 #include "rk3528.dtsi"
 
 / {
@@ -15,6 +17,54 @@ / {
 	chosen {
 		stdout-path = "serial0:1500000n8";
 	};
+
+	adc-keys {
+		compatible = "adc-keys";
+		io-channels = <&saradc 0>;
+		io-channel-names = "buttons";
+		keyup-threshold-microvolt = <1800000>;
+		poll-interval = <100>;
+
+		button-maskrom {
+			label = "MASKROM";
+			linux,code = <KEY_SETUP>;
+			press-threshold-microvolt = <0>;
+		};
+	};
+
+	vcc_1v8: regulator-1v8-vcc {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_1v8";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		vin-supply = <&vcc_3v3>;
+	};
+
+	vcc_3v3: regulator-3v3-vcc {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_3v3";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
+	vcc5v0_sys: regulator-5v0-vcc-sys {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_sys";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
+};
+
+&saradc {
+	vref-supply = <&vcc_1v8>;
+	status = "okay";
 };
 
 &uart0 {
-- 
2.48.1