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.c b/drivers/net/ethernet/wiznet/w5100.c
index 21bef2c..4f6255c 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -1052,7 +1052,7 @@
 static int w5100_mmio_probe(struct platform_device *pdev)
 {
 	struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
-	u8 *mac_addr = NULL;
+	const void *mac_addr = NULL;
 	struct resource *mem;
 	const struct w5100_ops *ops;
 	int irq;
@@ -1087,7 +1087,8 @@
 EXPORT_SYMBOL_GPL(w5100_ops_priv);
 
 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)
 {
 	struct w5100_priv *priv;
 	struct net_device *ndev;