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-rw-r--r--Documentation/driver-api/serial/n_gsm.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/driver-api/serial/n_gsm.rst b/Documentation/driver-api/serial/n_gsm.rst
index 4f37198423f7..0ba731ab00b2 100644
--- a/Documentation/driver-api/serial/n_gsm.rst
+++ b/Documentation/driver-api/serial/n_gsm.rst
@@ -23,7 +23,7 @@ Major parts of the initialization program :
(a good starting point is util-linux-ng/sys-utils/ldattach.c)::
#include <linux/gsmmux.h>
- #define N_GSM0710 21 /* GSM 0710 Mux */
+ #include <linux/tty.h>
#define DEFAULT_SPEED B115200
#define SERIAL_PORT /dev/ttyS0