diff --git a/arch/arm/src/sam34/sam_wdt.c b/arch/arm/src/sam34/sam_wdt.c
index 62075d9a76..a75f63097b 100644
--- a/arch/arm/src/sam34/sam_wdt.c
+++ b/arch/arm/src/sam34/sam_wdt.c
@@ -695,7 +695,9 @@ void sam_wdtinitialize(FAR const char *devpath)
 
   priv->window = priv->reload;
 
-  /* Register the watchdog driver as /dev/watchdog0 */
+  /* Register the watchdog driver, usually at CONFIG_WATCHDOG_DEVPATH
+   * (default /dev/watchdog0).
+   */
 
   (void)watchdog_register(devpath, (FAR struct watchdog_lowerhalf_s *)priv);
 
diff --git a/arch/arm/src/sama5/sam_wdt.c b/arch/arm/src/sama5/sam_wdt.c
index 26f40860b7..342aa5c8f3 100644
--- a/arch/arm/src/sama5/sam_wdt.c
+++ b/arch/arm/src/sama5/sam_wdt.c
@@ -687,9 +687,11 @@ int sam_wdt_initialize(void)
   (void)irq_attach(SAM_IRQ_WDT, sam_interrupt);
 #endif
 
-  /* Register the watchdog driver as /dev/watchdog0 */
+  /* Register the watchdog driver at the configured location (default
+   * /dev/watchdog0).
+   */
 
-  (void)watchdog_register("/dev/watchdog0",
+  (void)watchdog_register(CONFIG_WATCHDOG_DEVPATH,
                          (FAR struct watchdog_lowerhalf_s *)priv);
   return OK;
 }
diff --git a/arch/arm/src/samv7/sam_wdt.c b/arch/arm/src/samv7/sam_wdt.c
index d317bbd74d..850fd2288c 100644
--- a/arch/arm/src/samv7/sam_wdt.c
+++ b/arch/arm/src/samv7/sam_wdt.c
@@ -687,9 +687,11 @@ int sam_wdt_initialize(void)
   (void)irq_attach(SAM_IRQ_WDT, sam_interrupt);
 #endif
 
-  /* Register the watchdog driver as /dev/wdt */
+  /* Register the watchdog driver as device-node configured via .config.
+   * Normally /dev/watchdog0
+   */
 
-  (void)watchdog_register("/dev/wdt",
+  (void)watchdog_register(CONFIG_WATCHDOG_DEVPATH,
                          (FAR struct watchdog_lowerhalf_s *)priv);
   return OK;
 }