include/nuttx/wdog.h: Add some additional comments.

Documentation/NuttxPortingGuide.html

@@ -240,7 +240,7 @@
       <h1><big><font color="#3c34ec">
         <i>NuttX RTOS Porting Guide</i>
       </font></big></h1>
-      <p>Last Updated: April 2, 2020</p>
+      <p>Last Updated: April 7, 2020</p>
     </td>
   </tr>
 </table>
@@ -2948,6 +2948,10 @@ wd_start() on a given watchdog ID has any effect.
 <li><code>wdentry</code>. Function to call on timeout
 <li><code>argc</code>.  The number of uint32_t parameters to pass to wdentry.
 <li><code>...</code>. uint32_t size parameters to pass to wdentry
+
+<p>
+<b>NOTE</b>:  All parameters must be of type <code>wdparm_t</code>.
+</p>
 </ul>
 
 <p>

include/nuttx/wdog.h

@@ -1,36 +1,20 @@
 /****************************************************************************
  * include/nuttx/wdog.h
  *
- *   Copyright (C) 2007-2009, 2014-2015, 2018 Gregory Nutt. All rights
+ * Licensed to the Apache Software Foundation (ASF) under one or more
- *     reserved.
+ * contributor license agreements.  See the NOTICE file distributed with
- *   Author: Gregory Nutt <gnutt@nuttx.org>
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
  *
- * Redistribution and use in source and binary forms, with or without
+ *   http://www.apache.org/licenses/LICENSE-2.0
- * modification, are permitted provided that the following conditions
- * are met:
  *
- * 1. Redistributions of source code must retain the above copyright
+ * Unless required by applicable law or agreed to in writing, software
- *    notice, this list of conditions and the following disclaimer.
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * 2. Redistributions in binary form must reproduce the above copyright
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
- *    notice, this list of conditions and the following disclaimer in
+ * License for the specific language governing permissions and limitations
- *    the documentation and/or other materials provided with the
+ * under the License.
- *    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.
  *
  ****************************************************************************/
 
@@ -229,10 +213,12 @@ int wd_delete(WDOG_ID wdog);
  *   on a given watchdog ID has any effect.
  *
  * Input Parameters:
- *   wdog     - watchdog ID
+ *   wdog     - Watchdog ID
  *   delay    - Delay count in clock ticks
- *   wdentry  - function to call on timeout
+ *   wdentry  - Function to call on timeout
- *   parm1..4 - parameters to pass to wdentry
+ *   parm1..4 - Parameters to pass to wdentry.
+ *
+ *   NOTE:  All parameters must be of type wdparm_t.
  *
  * Returned Value:
  *   Zero (OK) is returned on success; a negated errno value is return to

sched/wdog/wd_start.c

@@ -151,10 +151,12 @@ static inline void wd_expiration(void)
  *   on a given watchdog ID has any effect.
  *
  * Input Parameters:
- *   wdog     - watchdog ID
+ *   wdog     - Watchdog ID
  *   delay    - Delay count in clock ticks
- *   wdentry  - function to call on timeout
+ *   wdentry  - Function to call on timeout
- *   parm1..4 - parameters to pass to wdentry
+ *   parm1..4 - Parameters to pass to wdentry
+ *
+ *   NOTE:  All parameters must be of type wdparm_t.
  *
  * Returned Value:
  *   Zero (OK) is returned on success; a negated errno value is return to