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>

drivers/net/ax88796.c

@@ -733,12 +733,19 @@ static int ax_init_dev(struct net_device *dev, int first_init)
 	/* load the mac-address from the device if this is the
 	 * first time we've initialised */
 
-	if (first_init && ax->plat->flags & AXFLG_MAC_FROMDEV) {
-		ei_outb(E8390_NODMA + E8390_PAGE1 + E8390_STOP,
-			ei_local->mem + E8390_CMD); /* 0x61 */
+	if (first_init) {
+		if (ax->plat->flags & AXFLG_MAC_FROMDEV) {
+			ei_outb(E8390_NODMA + E8390_PAGE1 + E8390_STOP,
+				ei_local->mem + E8390_CMD); /* 0x61 */
+			for (i = 0; i < ETHER_ADDR_LEN; i++)
+				dev->dev_addr[i] =
+					ei_inb(ioaddr + EN1_PHYS_SHIFT(i));
+		}
 
-		for (i = 0 ; i < ETHER_ADDR_LEN ; i++)
-			dev->dev_addr[i] = ei_inb(ioaddr + EN1_PHYS_SHIFT(i));
+		if ((ax->plat->flags & AXFLG_MAC_FROMPLATFORM) &&
+		     ax->plat->mac_addr)
+			memcpy(dev->dev_addr, ax->plat->mac_addr,
+				ETHER_ADDR_LEN);
 	}
 
 	ax_reset_8390(dev);

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 */