net: ll_temac: Utilize of_get_mac_address()

Do not open code getting the MAC address exclusively from the
"local-mac-address" property, but instead use of_get_mac_address()
which looks up the MAC address using the 3 typical property names.

Also avoid casting away the const qualifier of the return value by
making temac_init_mac_address() take a const void* address.

Follows commit b34296a9c047 ("net: ethoc: Utilize
of_get_mac_address()").

Cc: Florian Fainelli <[e-mail]>
Signed-off-by: Tobias Klauser <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/xilinx/ll_temac_main.c

···
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/of_mdio.h>
+#include <linux/of_net.h>
 #include <linux/of_platform.h>
 #include <linux/of_address.h>
 #include <linux/skbuff.h>
···
 	mutex_unlock(&lp->indirect_mutex);
 }
 
-static int temac_init_mac_address(struct net_device *ndev, void *address)
+static int temac_init_mac_address(struct net_device *ndev, const void *address)
 {
 	memcpy(ndev->dev_addr, address, ETH_ALEN);
 	if (!is_valid_ether_addr(ndev->dev_addr))
···
 	struct net_device *ndev;
 	const void *addr;
 	__be32 *p;
-	int size, rc = 0;
+	int rc = 0;
 
 	/* Init network device structure */
 	ndev = alloc_etherdev(sizeof(*lp));
···
 
 
 	/* Retrieve the MAC address */
-	addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
-	if ((!addr) || (size != 6)) {
+	addr = of_get_mac_address(op->dev.of_node);
+	if (!addr) {
 		dev_err(&op->dev, "could not find MAC address\n");
 		rc = -ENODEV;
 		goto err_iounmap_2;
 	}
-	temac_init_mac_address(ndev, (void *)addr);
+	temac_init_mac_address(ndev, addr);
 
 	rc = temac_mdio_setup(lp, op->dev.of_node);
 	if (rc)