[PATCH] lan743x: allow mac address to come from dt

[Tim Harvey]

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 <thar...@gateworks.com>
---
 drivers/net/ethernet/microchip/lan743x_main.c | 41 ++++++++++++++++-----------
 1 file changed, 25 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_main.c 
b/drivers/net/ethernet/microchip/lan743x_main.c
index 7ef22bf..50ad56b 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -12,6 +12,7 @@
 #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"
 
@@ -804,26 +805,29 @@ static int lan743x_mac_init(struct lan743x_adapter 
*adapter)
        data |= MAC_CR_CNTR_RST_;
        lan743x_csr_write(adapter, MAC_CR, data);
 
-       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;
-       adapter->mac_address[1] = (mac_addr_lo >> 8) & 0xFF;
-       adapter->mac_address[2] = (mac_addr_lo >> 16) & 0xFF;
-       adapter->mac_address[3] = (mac_addr_lo >> 24) & 0xFF;
-       adapter->mac_address[4] = mac_addr_hi & 0xFF;
-       adapter->mac_address[5] = (mac_addr_hi >> 8) & 0xFF;
+       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;
+               adapter->mac_address[1] = (mac_addr_lo >> 8) & 0xFF;
+               adapter->mac_address[2] = (mac_addr_lo >> 16) & 0xFF;
+               adapter->mac_address[3] = (mac_addr_lo >> 24) & 0xFF;
+               adapter->mac_address[4] = mac_addr_hi & 0xFF;
+               adapter->mac_address[5] = (mac_addr_hi >> 8) & 0xFF;
+
+               if (((mac_addr_hi & 0x0000FFFF) == 0x0000FFFF) &&
+                   mac_addr_lo == 0xFFFFFFFF) {
+                       mac_address_valid = false;
+               } else if (!is_valid_ether_addr(adapter->mac_address)) {
+                       mac_address_valid = false;
+               }
 
-       if (((mac_addr_hi & 0x0000FFFF) == 0x0000FFFF) &&
-           mac_addr_lo == 0xFFFFFFFF) {
-               mac_address_valid = false;
-       } else if (!is_valid_ether_addr(adapter->mac_address)) {
-               mac_address_valid = false;
+               if (!mac_address_valid)
+                       eth_random_addr(adapter->mac_address);
        }
-
-       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;
 }
 
@@ -2756,6 +2760,7 @@ 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,
@@ -2772,6 +2777,10 @@ 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;
-- 
2.7.4