am335x, guardian: boot stage feedback in headless mode

This patch enables the guardian board to provide feedback
  about the boot stage in headless mode. The on-board led
  would behave in the following pattern

    * U-boot -> GLOW LED
    * Linux  -> BLINK LED [HEART-BEAT PATTERN]

Signed-off-by: Moses Christopher <BollavarapuMoses.Christopher@in.bosch.com>

arch/arm/dts/am335x-guardian.dts

@@ -58,7 +58,7 @@
 			label = "guardian:life-led";
 			gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "heartbeat";
-			default-state = "off";
+			default-state = "on";
 		};
 	};
 

board/bosch/guardian/board.c

@@ -14,6 +14,7 @@
 #include <env_internal.h>
 #include <errno.h>
 #include <i2c.h>
+#include <led.h>
 #include <miiphy.h>
 #include <panel.h>
 #include <power/tps65217.h>
@@ -232,6 +233,9 @@ err:
 
 int board_late_init(void)
 {
+#ifdef CONFIG_LED_GPIO
+	led_default_state();
+#endif
 	set_bootmode_env();
 	return 0;
 }

configs/am335x_guardian_defconfig

@@ -37,6 +37,7 @@ CONFIG_CMD_SPL=y
 CONFIG_CMD_SPL_NAND_OFS=0x0
 CONFIG_CMD_ASKENV=y
 # CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_LED is not set
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
@@ -58,6 +59,8 @@ CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SPL_DM=y
 CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_BOOTCOUNT_ENV=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
 CONFIG_MISC=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y