lan743x: allow mac address to come from dt

If a valid mac address is present in dt, use that before using
CSR's or a random mac address.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/lan743x_main.c

@@ -15,6 +15,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/iopoll.h>
 #include <linux/crc16.h>
+#include <linux/of_net.h>
 #include "lan743x_main.h"
 #include "lan743x_ethtool.h"
 
@@ -807,6 +808,7 @@ static int lan743x_mac_init(struct lan743x_adapter *adapter)
 	data |= MAC_CR_CNTR_RST_;
 	lan743x_csr_write(adapter, MAC_CR, data);
 
+	if (!is_valid_ether_addr(adapter->mac_address)) {
 		mac_addr_hi = lan743x_csr_read(adapter, MAC_RX_ADDRH);
 		mac_addr_lo = lan743x_csr_read(adapter, MAC_RX_ADDRL);
 		adapter->mac_address[0] = mac_addr_lo & 0xFF;
@@ -825,8 +827,10 @@ static int lan743x_mac_init(struct lan743x_adapter *adapter)
 
 		if (!mac_address_valid)
 			eth_random_addr(adapter->mac_address);
+	}
 	lan743x_mac_set_address(adapter, adapter->mac_address);
 	ether_addr_copy(netdev->dev_addr, adapter->mac_address);
+
 	return 0;
 }
 
@@ -2817,6 +2821,7 @@ static int lan743x_pcidev_probe(struct pci_dev *pdev,
 {
 	struct lan743x_adapter *adapter = NULL;
 	struct net_device *netdev = NULL;
+	const void *mac_addr;
 	int ret = -ENODEV;
 
 	netdev = devm_alloc_etherdev(&pdev->dev,
@@ -2833,6 +2838,10 @@ static int lan743x_pcidev_probe(struct pci_dev *pdev,
 			      NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED;
 	netdev->max_mtu = LAN743X_MAX_FRAME_SIZE;
 
+	mac_addr = of_get_mac_address(pdev->dev.of_node);
+	if (!IS_ERR(mac_addr))
+		ether_addr_copy(adapter->mac_address, mac_addr);
+
 	ret = lan743x_pci_init(adapter, pdev);
 	if (ret)
 		goto return_error;