display5: wdt: Enable WDT support (both SPL and u-boot)

Test case:

The fitImage gets corrupted:

truncate -c -s 3M fitImage
run tftp_mmc_fitImg
setenv boot_os y
reset

[board shall hang in SPL with
"Trying to boot from MMC1" information]

Then after X seconds WDT is causing board to reset. After N boot attempts
we enter recovery mode.

Signed-off-by: Lukasz Majewski <lukma@denx.de>

board/liebherr/display5/spl.c

@@ -21,6 +21,7 @@
 #include <fsl_esdhc.h>
 #include <netdev.h>
 #include <bootcount.h>
+#include <watchdog.h>
 #include "common.h"
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -197,6 +198,10 @@ void board_init_f(ulong dummy)
 
 	displ5_set_iomux_misc_spl();
 
+	/* Initialize and reset WDT in SPL */
+	hw_watchdog_init();
+	WATCHDOG_RESET();
+
 	/* load/boot image from boot device */
 	board_init_r(NULL, 0);
 }

configs/display5_defconfig

@@ -10,6 +10,7 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
+CONFIG_SPL_WATCHDOG_SUPPORT=y
 CONFIG_DEFAULT_DEVICE_TREE="imx6q-display5"
 CONFIG_FIT=y
 CONFIG_SPL_LOAD_FIT=y

configs/display5_factory_defconfig

@@ -9,6 +9,7 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
+CONFIG_SPL_WATCHDOG_SUPPORT=y
 CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg,MX6Q"

include/configs/display5.h

@@ -383,6 +383,11 @@
 #define CONFIG_MTD_PARTITIONS
 #define CONFIG_MTD_DEVICE
 
+/* Watchdog */
+#define CONFIG_HW_WATCHDOG
+#define CONFIG_IMX_WATCHDOG
+#define CONFIG_WATCHDOG_TIMEOUT_MSECS   15000
+
 /* ENV config */
 #ifdef CONFIG_ENV_IS_IN_SPI_FLASH
 #define CONFIG_ENV_SIZE		(SZ_64K)