From da439eed06ff6806f22341ab0468226afc555305 Mon Sep 17 00:00:00 2001
From: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Date: Thu, 29 Aug 2024 14:27:00 +0200
Subject: [PATCH] arm64: dts: rockchip: add Mask Rom key on NanoPC-T6

Mask Rom key is connected to SARADC and can be read from OS.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Link: https://lore.kernel.org/r/20240829-friendlyelec-nanopc-t6-lts-v6-9-edff247e8c02@linaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
 .../arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
@@ -8,6 +8,7 @@
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include <dt-bindings/usb/pd.h>
 #include "rk3588.dtsi"
@@ -21,6 +22,20 @@
 		mmc1 = &sdmmc;
 	};
 
+	adc-keys-0 {
+		compatible = "adc-keys";
+		io-channels = <&saradc 0>;
+		io-channel-names = "buttons";
+		keyup-threshold-microvolt = <1800000>;
+		poll-interval = <100>;
+
+		button-maskrom {
+			label = "Mask Rom";
+			linux,code = <KEY_SETUP>;
+			press-threshold-microvolt = <2000>;
+		};
+	};
+
 	chosen {
 		stdout-path = "serial2:1500000n8";
 	};