net: ethernet: cortina: permit to set mac address in DT

Add ability of setting mac address in DT for cortina ethernet driver.
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220125210811.54350-1-clabbe@baylibre.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/cortina/gemini.c

@@ -2363,11 +2363,13 @@ static void gemini_port_save_mac_addr(struct gemini_ethernet_port *port)
 static int gemini_ethernet_port_probe(struct platform_device *pdev)
 {
 	char *port_names[2] = { "ethernet0", "ethernet1" };
+	struct device_node *np = pdev->dev.of_node;
 	struct gemini_ethernet_port *port;
 	struct device *dev = &pdev->dev;
 	struct gemini_ethernet *geth;
 	struct net_device *netdev;
 	struct device *parent;
+	u8 mac[ETH_ALEN];
 	unsigned int id;
 	int irq;
 	int ret;
@@ -2473,6 +2475,12 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
 	netif_napi_add(netdev, &port->napi, gmac_napi_poll,
 		       DEFAULT_NAPI_WEIGHT);
 
+	ret = of_get_mac_address(np, mac);
+	if (!ret) {
+		dev_info(dev, "Setting macaddr from DT %pM\n", mac);
+		memcpy(port->mac_addr, mac, ETH_ALEN);
+	}
+
 	if (is_valid_ether_addr((void *)port->mac_addr)) {
 		eth_hw_addr_set(netdev, (u8 *)port->mac_addr);
 	} else {