1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 1488d8c81aa..26af9816391 100644
--- 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               19
+#define NR_LDISCS               20
 
 /* line disciplines */
 #define N_TTY           0
@@ -47,6 +47,8 @@
 #define N_SLCAN         17      /* Serial / USB serial CAN Adaptors */
 #define N_PPS           18      /* Pulse per Second */
 
+#define N_AMSDELTA      19      /* codec control over modem, board specific */
+
 /*
  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  * a c_cc[] character, but indicates that a particular special character