netdev - [PATCH 11/15] net: ftgmac100: Move DT probe into a helper

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Message-ID: <20260105-ftgmac-cleanup-v1-11-b68e4a3d8fbe@aspeedtech.com>
Date: Mon, 5 Jan 2026 15:08:57 +0800
From: Jacky Chou <jacky_chou@...eedtech.com>
To: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Andrew Lunn
	<andrew@...n.ch>, Jacky Chou <jacky_chou@...eedtech.com>
Subject: [PATCH 11/15] net: ftgmac100: Move DT probe into a helper

From: Andrew Lunn <andrew@...n.ch>

By moving all the DT probe code into a helper, the complex if else if
else structure can be simplified. No functional change intended.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Jacky Chou <jacky_chou@...eedtech.com>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 89 +++++++++++++++++++-------------
 1 file changed, 54 insertions(+), 35 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index cc01cf616229..d30b0b050648 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1870,6 +1870,58 @@ static int ftgmac100_probe_ncsi(struct net_device *netdev,
 	return err;
 }
 
+static int ftgmac100_probe_dt(struct net_device *netdev,
+			      struct platform_device *pdev,
+			      struct ftgmac100 *priv,
+			      struct device_node *np)
+{
+	struct phy_device *phy;
+	int err;
+
+	if (of_get_property(np, "use-ncsi", NULL))
+		return ftgmac100_probe_ncsi(netdev, priv, pdev);
+
+	if (of_phy_is_fixed_link(np) ||
+	    of_get_property(np, "phy-handle", NULL)) {
+		/* Support "mdio"/"phy" child nodes for ast2400/2500
+		 * with an embedded MDIO controller. Automatically
+		 * scan the DTS for available PHYs and register
+		 * them. 2600 has an independent MDIO controller, not
+		 * part of the MAC.
+		 */
+		phy = of_phy_get_and_connect(priv->netdev, np,
+					     &ftgmac100_adjust_link);
+		if (!phy) {
+			dev_err(&pdev->dev, "Failed to connect to phy\n");
+			return -EINVAL;
+		}
+
+		/* Indicate that we support PAUSE frames (see comment in
+		 * Documentation/networking/phy.rst)
+		 */
+		phy_support_asym_pause(phy);
+
+		/* Display what we found */
+		phy_attached_info(phy);
+		return 0;
+	}
+
+	if (!ftgmac100_has_child_node(np, "mdio")) {
+		/* Support legacy ASPEED devicetree descriptions that
+		 * decribe a MAC with an embedded MDIO controller but
+		 * have no "mdio" child node. Automatically scan the
+		 * MDIO bus for available PHYs.
+		 */
+		err = ftgmac100_mii_probe(netdev);
+		if (err) {
+			dev_err(priv->dev, "MII probe failed!\n");
+			return err;
+		}
+	}
+
+	return 0;
+}
+
 static int ftgmac100_probe(struct platform_device *pdev)
 {
 	const struct ftgmac100_match_data *match_data;
@@ -1966,41 +2018,10 @@ static int ftgmac100_probe(struct platform_device *pdev)
 			goto err_phy_connect;
 	}
 
-	if (np && of_get_property(np, "use-ncsi", NULL)) {
-		err = ftgmac100_probe_ncsi(netdev, priv, pdev);
+	if (np) {
+		err = ftgmac100_probe_dt(netdev, pdev, priv, np);
 		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;
-
-		phy = of_phy_get_and_connect(priv->netdev, np,
-					     &ftgmac100_adjust_link);
-		if (!phy) {
-			dev_err(&pdev->dev, "Failed to connect to phy\n");
-			err = -EINVAL;
 			goto err_phy_connect;
-		}
-
-		/* Indicate that we support PAUSE frames (see comment in
-		 * Documentation/networking/phy.rst)
-		 */
-		phy_support_asym_pause(phy);
-
-		/* Display what we found */
-		phy_attached_info(phy);
-	} else if (np && !ftgmac100_has_child_node(np, "mdio")) {
-		/* Support legacy ASPEED devicetree descriptions that decribe a
-		 * MAC with an embedded MDIO controller but have no "mdio"
-		 * child node. Automatically scan the MDIO bus for available
-		 * PHYs.
-		 */
-		err = ftgmac100_mii_probe(netdev);
-		if (err) {
-			dev_err(priv->dev, "MII probe failed!\n");
-			goto err_ncsi_dev;
-		}
-
 	}
 
 	priv->rst = devm_reset_control_get_optional_exclusive(priv->dev, NULL);
@@ -2058,11 +2079,9 @@ static int ftgmac100_probe(struct platform_device *pdev)
 err_register_netdev:
 err_phy_connect:
 	ftgmac100_phy_disconnect(netdev);
-err_ncsi_dev:
 	if (priv->ndev)
 		ncsi_unregister_dev(priv->ndev);
 	ftgmac100_destroy_mdio(netdev);
-err_setup_mdio:
 	return err;
 }
 

-- 
2.34.1