[PATCH 3/3] arm64: dts: rockchip: Add saradc node to rk3588s-indiedroid-nova

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

Add ADC support for the Indiedroid Nova, as well as the two ADC buttons
found on the device. The buttons are documented as "boot" and
"recovery". The boot button is used by the bootloader to boot into USB
recovery mode. The recovery button use is currently unknown.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 .../dts/rockchip/rk3588s-indiedroid-nova.dts  | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts b/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
index 1e2336d3065b..4c2d662d9c97 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
@@ -3,6 +3,7 @@
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include <dt-bindings/usb/pd.h>
 #include "rk3588s.dtsi"
@@ -11,6 +12,34 @@ / {
 	model = "Indiedroid Nova";
 	compatible = "indiedroid,nova", "rockchip,rk3588s";
 
+	adc_keys0 {
+		compatible = "adc-keys";
+		io-channel-names = "buttons";
+		io-channels = <&saradc 0>;
+		keyup-threshold-microvolt = <1800000>;
+		poll-interval = <100>;
+
+		button-boot {
+			label = "boot";
+			linux,code = <KEY_PROG1>;
+			press-threshold-microvolt = <18000>;
+		};
+	};
+
+	adc_keys1 {
+		compatible = "adc-keys";
+		io-channel-names = "buttons";
+		io-channels = <&saradc 1>;
+		keyup-threshold-microvolt = <1800000>;
+		poll-interval = <100>;
+
+		button-recovery {
+			label = "recovery";
+			linux,code = <KEY_PROG2>;
+			press-threshold-microvolt = <18000>;
+		};
+	};
+
 	aliases {
 		mmc0 = &sdhci;
 		mmc1 = &sdmmc;
@@ -410,6 +439,11 @@ typec5v_pwren: typec5v-pwren {
 	};
 };
 
+&saradc {
+	vref-supply = <&vcca_1v8_s0>;
+	status = "okay";
+};
+
 /* HS400 modes seemed to cause io errors. */
 &sdhci {
 	bus-width = <8>;
-- 
2.34.1