net: w5100-spi: add support to specify MAC address by device tree

This adds support to specify the MAC address by 'mac-address' or
'local-mac-address' properties in the device tree.  These are common
properties for the Ethernet controller.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Mike Sinkovsky <msink@permonline.ru>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/wiznet/w5100.h b/drivers/net/ethernet/wiznet/w5100.h
index f8a16fa..17983a3 100644
--- a/drivers/net/ethernet/wiznet/w5100.h
+++ b/drivers/net/ethernet/wiznet/w5100.h
@@ -30,7 +30,8 @@
 void *w5100_ops_priv(const struct net_device *ndev);
 
 int w5100_probe(struct device *dev, const struct w5100_ops *ops,
-		int sizeof_ops_priv, u8 *mac_addr, int irq, int link_gpio);
+		int sizeof_ops_priv, const void *mac_addr, int irq,
+		int link_gpio);
 int w5100_remove(struct device *dev);
 
 extern const struct dev_pm_ops w5100_pm_ops;