net: ftgmac100: support getting MAC address from NVMEM

Make use of of_get_ethdev_address() to support reading MAC address not
only from the usual DT nodes but also from an NVMEM provider (e.g. using
a dedicated area in an FRU EEPROM).

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Link: https://lore.kernel.org/r/20230713095743.30517-1-fercerpav@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index a03879a..9135b91 100644 (file)
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -177,16 +177,20 @@ static void ftgmac100_write_mac_addr(struct ftgmac100 *priv, const u8 *mac)
        iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR);
 }
 
-static void ftgmac100_initial_mac(struct ftgmac100 *priv)
+static int ftgmac100_initial_mac(struct ftgmac100 *priv)
 {
        u8 mac[ETH_ALEN];
        unsigned int m;
        unsigned int l;
+       int err;
 
-       if (!device_get_ethdev_address(priv->dev, priv->netdev)) {
+       err = of_get_ethdev_address(priv->dev->of_node, priv->netdev);
+       if (err == -EPROBE_DEFER)
+               return err;
+       if (!err) {
                dev_info(priv->dev, "Read MAC address %pM from device tree\n",
                         priv->netdev->dev_addr);
-               return;
+               return 0;
        }
 
        m = ioread32(priv->base + FTGMAC100_OFFSET_MAC_MADR);
@@ -207,6 +211,8 @@ static void ftgmac100_initial_mac(struct ftgmac100 *priv)
                dev_info(priv->dev, "Generated random MAC address %pM\n",
                         priv->netdev->dev_addr);
        }
+
+       return 0;
 }
 
 static int ftgmac100_set_mac_addr(struct net_device *dev, void *p)
@@ -1843,7 +1849,9 @@ static int ftgmac100_probe(struct platform_device *pdev)
        priv->aneg_pause = true;
 
        /* MAC address from chip or random one */
-       ftgmac100_initial_mac(priv);
+       err = ftgmac100_initial_mac(priv);
+       if (err)
+               goto err_phy_connect;
 
        np = pdev->dev.of_node;
        if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac") ||