ax88796: Add method to take MAC from platform data

Implement a way to provide the MAC address for ax88796 devices from
their platform data. Boards might decide to set the address
programmatically, taken from boot tags or other sources.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ax88796.h b/include/net/ax88796.h
index 51329da..b9a3bec 100644
--- a/include/net/ax88796.h
+++ b/include/net/ax88796.h
@@ -15,14 +15,17 @@
 #define AXFLG_HAS_EEPROM		(1<<0)
 #define AXFLG_MAC_FROMDEV		(1<<1)	/* device already has MAC */
 #define AXFLG_HAS_93CX6			(1<<2)	/* use eeprom_93cx6 driver */
+#define AXFLG_MAC_FROMPLATFORM		(1<<3)	/* MAC given by platform data */
 
 struct ax_plat_data {
 	unsigned int	 flags;
-	unsigned char	 wordlength;		/* 1 or 2 */
-	unsigned char	 dcr_val;		/* default value for DCR */
-	unsigned char	 rcr_val;		/* default value for RCR */
-	unsigned char	 gpoc_val;		/* default value for GPOC */
-	u32		*reg_offsets;		/* register offsets */
+	unsigned char	 wordlength;	/* 1 or 2 */
+	unsigned char	 dcr_val;	/* default value for DCR */
+	unsigned char	 rcr_val;	/* default value for RCR */
+	unsigned char	 gpoc_val;	/* default value for GPOC */
+	u32		*reg_offsets;	/* register offsets */
+	u8		*mac_addr;	/* MAC addr (only used when
+					   AXFLG_MAC_FROMPLATFORM is used */
 };
 
 #endif /* __NET_AX88796_PLAT_H */