arm64: dts: freescale: debix-som: Add heartbeat LED

Map the 'RUN' LED present on the Debix-SOM as a heartbeat.
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-debix-som-a.dtsi

@@ -6,6 +6,8 @@
 
 #include "imx8mp.dtsi"
 
+#include <dt-bindings/leds/common.h>
+
 / {
 	model = "Polyhex i.MX8MPlus Debix SOM A";
 	compatible = "polyhex,imx8mp-debix-som-a", "fsl,imx8mp";
@@ -20,6 +22,20 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
 		gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio_led>;
+
+		led-0 {
+			gpios = <&gpio3 16 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+			linux,default-trigger = "heartbeat";
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
+		};
+	};
 };
 
 &A53_0 {
@@ -203,6 +219,12 @@ &wdog1 {
 };
 
 &iomuxc {
+	pinctrl_gpio_led: gpioledgrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_NAND_READY_B__GPIO3_IO16		0x19
+		>;
+	};
+
 	pinctrl_i2c1: i2c1grp {
 		fsl,pins = <
 			MX8MP_IOMUXC_I2C1_SCL__I2C1_SCL			0x400001c2