arch: samd5e5 : Add watchdog timer drivers.

boards: metro-m4  Add support for starting the watchdog timer on the metro-m4.

Testing:
- Build check only

Signed-off-by: Leomar Mateus Radke  <leomar@falker.com.br>

arch/arm/src/samd5e5/hardware/sam_wdt.h

@@ -92,7 +92,7 @@
 #  define WDT_CONFIG_PER_1K        (7  << WDT_CONFIG_PER_SHIFT) /* 1024 clock cycles */
 #  define WDT_CONFIG_PER_2K        (8  << WDT_CONFIG_PER_SHIFT) /* 2048 clock cycles */
 #  define WDT_CONFIG_PER_4K        (9  << WDT_CONFIG_PER_SHIFT) /* 4096 clock cycles */
-#  define WDT_CONFIG_PER_8k        (10 << WDT_CONFIG_PER_SHIFT) /* 8192 clock cycles */
+#  define WDT_CONFIG_PER_8K        (10 << WDT_CONFIG_PER_SHIFT) /* 8192 clock cycles */
 #  define WDT_CONFIG_PER_16K       (11 << WDT_CONFIG_PER_SHIFT) /* 16384 clock cycles */
 #define WDT_CONFIG_WINDOW_SHIFT    (4)       /* Bits 4-7: Window Mode Time-Out Period */
 #define WDT_CONFIG_WINDOW_MASK     (15 << WDT_CONFIG_WINDOW_SHIFT)

arch/arm/src/samd5e5/sam_wdt.h

@@ -0,0 +1,97 @@
+/****************************************************************************
+ * arch/arm/src/sama5/sam_wdt.h
+ *
+ *   Copyright (C) 2020 Falker Automacao Agricola LTDA.
+ *   Author: Leomar Mateus Radke <leomar@falker.com.br>
+ *   Author: Ricardo Wartchow <wartchow@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAMD5E5_SAM_WDT_H
+#define __ARCH_ARM_SRC_SAMD5E5_SAM_WDT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "hardware/sam_wdt.h"
+
+#ifdef CONFIG_SAMD5E5_WDT
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_wdt_initialize()
+ *
+ * Description:
+ *   Perform architecture-specific initialization of the Watchdog hardware.
+ *   This interface should be provided by all configurations using
+ *   to avoid exposed platform-dependent logic.
+ *
+ *   At a minimum, this function should call watchdog_register().
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+void sam_wdt_initialize(FAR const char *devpath);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_SAMD5E5_WDT */
+#endif /* __ARCH_ARM_SRC_SAMD5E5_SAM_WDT_H */

boards/arm/samd5e5/metro-m4/src/sam_bringup.c

@@ -47,6 +47,10 @@
 
 #include "metro-m4.h"
 
+#if defined(CONFIG_SAMD5E5_WDT) && defined(CONFIG_WATCHDOG)
+  #include "sam_wdt.h"
+#endif
+
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -86,6 +90,10 @@ int sam_bringup(void)
     }
 #endif
 
+#if defined(CONFIG_SAMD5E5_WDT) && defined(CONFIG_WATCHDOG)
+  (void)sam_wdt_initialize(CONFIG_WATCHDOG_DEVPATH);
+#endif
+
   UNUSED(ret);
   return OK;
 }