net: ftgmac100: Move NCSI probe code into a helper

To help reduce the complexity of the probe function, move the NCSI
probe code into a helper.

The refactoring results in improved cleanup of the fixed PHY in
error paths.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
Link: https://patch.msgid.link/20260206-ftgmac-cleanup-v5-8-ad28a9067ea7@aspeedtech.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: lunn

drivers/net/ethernet/faraday/ftgmac100.c

@@ -1839,14 +1839,55 @@ static bool ftgmac100_has_child_node(struct device_node *np, const char *name)
 	return ret;
 }
 
+static int ftgmac100_probe_ncsi(struct net_device *netdev,
+				struct ftgmac100 *priv,
+				struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct phy_device *phydev;
+	int err;
+
+	if (!IS_ENABLED(CONFIG_NET_NCSI)) {
+		dev_err(&pdev->dev, "NCSI stack not enabled\n");
+		return -EINVAL;
+	}
+
+	dev_info(&pdev->dev, "Using NCSI interface\n");
+	priv->use_ncsi = true;
+	priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
+	if (!priv->ndev)
+		return -EINVAL;
+
+	phydev = fixed_phy_register(&ncsi_phy_status, np);
+	if (IS_ERR(phydev)) {
+		dev_err(&pdev->dev, "failed to register fixed PHY device\n");
+		err = PTR_ERR(phydev);
+		goto err_register_ndev;
+	}
+	err = phy_connect_direct(netdev, phydev, ftgmac100_adjust_link,
+				 PHY_INTERFACE_MODE_RMII);
+	if (err) {
+		dev_err(&pdev->dev, "Connecting PHY failed\n");
+		goto err_register_phy;
+	}
+
+	return 0;
+err_register_phy:
+	fixed_phy_unregister(phydev);
+err_register_ndev:
+	if (priv->ndev)
+		ncsi_unregister_dev(priv->ndev);
+	priv->ndev = NULL;
+	return err;
+}
+
 static int ftgmac100_probe(struct platform_device *pdev)
 {
 	const struct ftgmac100_match_data *match_data;
 	enum ftgmac100_mac_id mac_id;
 	struct resource *res;
 	int irq;
 	struct net_device *netdev;
-	struct phy_device *phydev;
 	struct ftgmac100 *priv;
 	struct device_node *np;
 	int err = 0;
@@ -1928,32 +1969,9 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	}
 
 	if (np && of_get_property(np, "use-ncsi", NULL)) {
-		if (!IS_ENABLED(CONFIG_NET_NCSI)) {
-			dev_err(&pdev->dev, "NCSI stack not enabled\n");
-			err = -EINVAL;
-			goto err_phy_connect;
-		}
-
-		dev_info(&pdev->dev, "Using NCSI interface\n");
-		priv->use_ncsi = true;
-		priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
-		if (!priv->ndev) {
-			err = -EINVAL;
-			goto err_phy_connect;
-		}
-
-		phydev = fixed_phy_register(&ncsi_phy_status, np);
-		if (IS_ERR(phydev)) {
-			dev_err(&pdev->dev, "failed to register fixed PHY device\n");
-			err = PTR_ERR(phydev);
-			goto err_phy_connect;
-		}
-		err = phy_connect_direct(netdev, phydev, ftgmac100_adjust_link,
-					 PHY_INTERFACE_MODE_RMII);
-		if (err) {
-			dev_err(&pdev->dev, "Connecting PHY failed\n");
-			goto err_phy_connect;
-		}
+		err = ftgmac100_probe_ncsi(netdev, priv, pdev);
+		if (err)
+			goto err_setup_mdio;
 	} else if (np && (of_phy_is_fixed_link(np) ||
 			  of_get_property(np, "phy-handle", NULL))) {
 		struct phy_device *phy;