[PATCH 2/3] arm64: dts: allwinner: h616: orangepi-zero2w: add 24-pin expansion buttons and IR

[Vladimir <anykey196@gmail.com>]

The optional 24-pin expansion board exposes two LRADC buttons and an IR
receiver. KEY1/KEY2 are on LRADC channel 0 (measured ~1.0 V / ~1.6 V) and are
wired to KEY_1 / KEY_ENTER; the IR receiver is on the SoC ir controller (PH10).

Tested on: OrangePi Zero 2W (Allwinner H618).

Signed-off-by: Vladimir <anykey196@gmail.com>
---
 .../allwinner/sun50i-h618-orangepi-zero2w.dts | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts b/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts
index ff9b40352..1b690e3cd 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts
@@ -10,6 +10,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/leds/common.h>
 
 / {
@@ -189,3 +190,31 @@ &usbphy {
 	usb1_vbus-supply = <&reg_vcc5v>;
 	status = "okay";
 };
+
+/*
+ * Buttons and IR receiver on the optional 24-pin expansion board.
+ * KEY1 -> KEY_1, KEY2 -> KEY_ENTER (LRADC channel 0).
+ */
+&lradc {
+	vref-supply = <&reg_vcc3v3>;
+	status = "okay";
+	wakeup-source;
+
+	button-1000 {
+		label = "KEY_1";
+		linux,code = <KEY_1>;
+		channel = <0>;
+		voltage = <1000000>;
+	};
+
+	button-1600 {
+		label = "KEY_ENTER";
+		linux,code = <KEY_ENTER>;
+		channel = <0>;
+		voltage = <1600000>;
+	};
+};
+
+&ir {
+	status = "okay";
+};
-- 
2.53.0