pps: Reserve a line discipline number for PPS

Add a new line discipline for "pulse per second" devices connected to
a serial port.

Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 7271c6247d82084c24ad2cdb92d109c6fe270100..e3612c3ac194def233aa9be7c10dca0548a631c3 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -23,7 +23,7 @@
  */
 #define NR_UNIX98_PTY_DEFAULT  4096      /* Default maximum for Unix98 ptys */
 #define NR_UNIX98_PTY_MAX      (1 << MINORBITS) /* Absolute limit */
-#define NR_LDISCS              18
+#define NR_LDISCS              19
 
 /* line disciplines */
 #define N_TTY          0
@@ -45,6 +45,7 @@
 #define N_HCI          15      /* Bluetooth HCI UART */
 #define N_GIGASET_M101 16      /* Siemens Gigaset M101 serial DECT adapter */
 #define N_SLCAN                17      /* Serial / USB serial CAN Adaptors */
+#define N_PPS          18      /* Pulse per Second */
 
 /*
  * This character is the same as _POSIX_VDISABLE: it cannot be used as