Documentation: rs485: Do not define manually the ioctl

It is not a very good practice to define the IOCTL manually instead of
using the header file.

Fix it on the documentation example.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/serial/serial-rs485.txt b/Documentation/serial/serial-rs485.txt
index 2253b8b..389fcd4 100644 (file)
--- a/Documentation/serial/serial-rs485.txt
+++ b/Documentation/serial/serial-rs485.txt
@@ -45,9 +45,8 @@
 
        #include <linux/serial.h>
 
-       /* RS485 ioctls: */
-       #define TIOCGRS485      0x542E
-       #define TIOCSRS485      0x542F
+       /* Include definition for RS485 ioctls: TIOCGRS485 and TIOCSRS485 */
+       #include <sys/ioctl.h>
 
        /* Open your specific device (e.g., /dev/mydevice): */
        int fd = open ("/dev/mydevice", O_RDWR);