synclink_gt: add clock options

Add support for x8 asynchronous sample rate and ability to specify base
clock frequency.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/synclink.h b/include/linux/synclink.h
index 99b8bdb..0ff2779 100644
--- a/include/linux/synclink.h
+++ b/include/linux/synclink.h
@@ -125,6 +125,7 @@
 #define MGSL_MODE_MONOSYNC	3
 #define MGSL_MODE_BISYNC	4
 #define MGSL_MODE_RAW		6
+#define MGSL_MODE_BASE_CLOCK    7
 
 #define MGSL_BUS_TYPE_ISA	1
 #define MGSL_BUS_TYPE_EISA	2