The X550EM_a device provides the MAC_SGMII_BUSY register to
indicate when slow SGMII register writes complete. Add
definitions for the register. No definitions are provided for
the individual bits under the theory that it is better to wait
for everything to complete when needed rather than try to map
out which reads need to wait for which writes. So we should wait
when anything is marked as "busy".

Signed-off-by: Wenzhuo Lu <redacted>
---
 drivers/net/ixgbe/base/ixgbe_type.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ixgbe/base/ixgbe_type.h b/drivers/net/ixgbe/base/ixgbe_type.h
index 9c2a89a..daa4182 100644
--- a/drivers/net/ixgbe/base/ixgbe_type.h
+++ b/drivers/net/ixgbe/base/ixgbe_type.h

@@ -1285,6 +1285,7 @@ struct ixgbe_dmac_config {
 #define IXGBE_XPCSS		0x04290
 #define IXGBE_MFLCN		0x04294
 #define IXGBE_SERDESC		0x04298
+#define IXGBE_MAC_SGMII_BUSY	0x04298
 #define IXGBE_MACS		0x0429C
 #define IXGBE_AUTOC		0x042A0
 #define IXGBE_LINKS		0x042A4

-- 
1.9.3