arm64: dts: rockchip: Add reset button to NanoPi R5S

The NanoPi R5S LTS version has a reset button, which is connected via
GPIO. Note that the non-LTS version does not have the reset button and
therefore on page 19 of the schematic version 2204 it is marked 'NC',
but it is connected on the LTS version.

Signed-off-by: Diederik de Haas <didi.debian@cknow.org>
Link: https://lore.kernel.org/r/20250711142138.197445-1-didi.debian@cknow.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: diederikdehaas

arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts

@@ -17,6 +17,19 @@
 		ethernet0 = &gmac0;
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+		pinctrl-0 = <&gpio4_a0_k1_pin>;
+		pinctrl-names = "default";
+
+		button-reset {
+			debounce-interval = <50>;
+			gpios = <&gpio4 RK_PA0 GPIO_ACTIVE_LOW>;
+			label = "RESET";
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
 	gpio-leds {
 		compatible = "gpio-leds";
 		pinctrl-names = "default";
@@ -127,6 +140,12 @@
 		};
 	};
 
+	gpio-keys {
+		gpio4_a0_k1_pin: gpio4-a0-k1-pin {
+			rockchip,pins = <4 RK_PA0 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	gpio-leds {
 		lan1_led_pin: lan1-led-pin {
 			rockchip,pins = <3 RK_PD6 RK_FUNC_GPIO &pcfg_pull_none>;