It should be save to just copy it.
This was added in this upstream commit:
commit 9961127d4bce6325e9a0b0fb105e0c85a6c62cb7
Author: Vincent Cuissard <cuiss...@marvell.com>
Date: Thu Jun 11 11:25:47 2015 +0200
NFC: nci: add generic uart support
Signed-off-by: Hauke Mehrtens <ha...@hauke-m.de>
---
backport/backport-include/linux/tty.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/backport/backport-include/linux/tty.h
b/backport/backport-include/linux/tty.h
index 3b8a0a2..7462ac3 100644
--- a/backport/backport-include/linux/tty.h
+++ b/backport/backport-include/linux/tty.h
@@ -29,4 +29,8 @@ extern void tty_port_tty_hangup(struct tty_port *port, bool
check_clocal);
extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4,1,0) */
+#ifndef N_NCI
+#define N_NCI 25 /* NFC NCI UART */
+#endif
+
#endif /* __BACKPORT_LINUX_TTY_H */
--
2.1.4
--
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