Add support for blinking LED

board/businesscard/v1/dts/businesscard.dts

@@ -28,6 +28,26 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&led_pins>;
+
+		heartbeat {
+			label = "Heartbeat";
+			gpios = <&pio 3 7 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+			linux,default-trigger = "heartbeat";
+		};
+	};
+};
+
+&pio {
+	led_pins: led_pins {
+		pins = "PD7";
+		function = "gpio_out";
+	};
 };
 
 &spi0 {

board/businesscard/v1/linux_defconfig

@@ -82,7 +82,6 @@ CONFIG_LEDS_CLASS=y
 CONFIG_LEDS_GPIO=y
 CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
-CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
 CONFIG_SYNC_FILE=y
 # CONFIG_VIRTIO_MENU is not set
 CONFIG_SUN8I_A83T_CCU=y

board/businesscard/v1/uboot_defconfig

@@ -43,6 +43,8 @@ CONFIG_CMD_UBI=y
 CONFIG_DEFAULT_DEVICE_TREE="businesscard"
 # CONFIG_NET is not set
 CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
 CONFIG_DM_SPI_FLASH=y