v4.19.13 snapshot.
diff --git a/include/linux/synclink.h b/include/linux/synclink.h
new file mode 100644
index 0000000..f1405b1
--- /dev/null
+++ b/include/linux/synclink.h
@@ -0,0 +1,37 @@
+/*
+ * SyncLink Multiprotocol Serial Adapter Driver
+ *
+ * $Id: synclink.h,v 3.14 2006/07/17 20:15:43 paulkf Exp $
+ *
+ * Copyright (C) 1998-2000 by Microgate Corporation
+ *
+ * Redistribution of this file is permitted under
+ * the terms of the GNU Public License (GPL)
+ */
+#ifndef _SYNCLINK_H_
+#define _SYNCLINK_H_
+
+#include <uapi/linux/synclink.h>
+
+/* provide 32 bit ioctl compatibility on 64 bit systems */
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+struct MGSL_PARAMS32 {
+ compat_ulong_t mode;
+ unsigned char loopback;
+ unsigned short flags;
+ unsigned char encoding;
+ compat_ulong_t clock_speed;
+ unsigned char addr_filter;
+ unsigned short crc_type;
+ unsigned char preamble_length;
+ unsigned char preamble;
+ compat_ulong_t data_rate;
+ unsigned char data_bits;
+ unsigned char stop_bits;
+ unsigned char parity;
+};
+#define MGSL_IOCSPARAMS32 _IOW(MGSL_MAGIC_IOC,0,struct MGSL_PARAMS32)
+#define MGSL_IOCGPARAMS32 _IOR(MGSL_MAGIC_IOC,1,struct MGSL_PARAMS32)
+#endif
+#endif /* _SYNCLINK_H_ */