net: macb: Reorganize macb_mii bringup

The macb mii setup (mii_probe() and mii_init()) previously was
somewhat interspersed, likely a result of organic growth and hacking.

This change moves mii bus registration into mii_init and probing the
bus for devices into mii_probe.
Signed-off-by: Brad Mouring <brad.mouring@ni.com>
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb_main.c

@@ -472,8 +472,42 @@ static int macb_mii_probe(struct net_device *dev)
 	struct macb *bp = netdev_priv(dev);
 	struct macb_platform_data *pdata;
 	struct phy_device *phydev;
-	int phy_irq;
-	int ret;
+	struct device_node *np;
+	int phy_irq, ret, i;
+
+	pdata = dev_get_platdata(&bp->pdev->dev);
+	np = bp->pdev->dev.of_node;
+	ret = 0;
+
+	if (np) {
+		if (of_phy_is_fixed_link(np)) {
+			if (of_phy_register_fixed_link(np) < 0) {
+				dev_err(&bp->pdev->dev,
+					"broken fixed-link specification\n");
+				return -ENODEV;
+			}
+			bp->phy_node = of_node_get(np);
+		} else {
+			/* fallback to standard phy registration if no phy were
+			 * found during dt phy registration
+			 */
+			if (!phy_find_first(bp->mii_bus)) {
+				for (i = 0; i < PHY_MAX_ADDR; i++) {
+					struct phy_device *phydev;
+
+					phydev = mdiobus_scan(bp->mii_bus, i);
+					if (IS_ERR(phydev) &&
+					    PTR_ERR(phydev) != -ENODEV) {
+						ret = PTR_ERR(phydev);
+						break;
+					}
+				}
+
+				if (ret)
+					return -ENODEV;
+			}
+		}
+	}
 
 	if (bp->phy_node) {
 		phydev = of_phy_connect(dev, bp->phy_node,
@@ -488,7 +522,6 @@ static int macb_mii_probe(struct net_device *dev)
 			return -ENXIO;
 		}
 
-		pdata = dev_get_platdata(&bp->pdev->dev);
 		if (pdata) {
 			if (gpio_is_valid(pdata->phy_irq_pin)) {
 				ret = devm_gpio_request(&bp->pdev->dev,
@@ -533,7 +566,7 @@ static int macb_mii_init(struct macb *bp)
 {
 	struct macb_platform_data *pdata;
 	struct device_node *np;
-	int err = -ENXIO, i;
+	int err, i;
 
 	/* Enable management port */
 	macb_writel(bp, NCR, MACB_BIT(MPE));
@@ -556,39 +589,9 @@ static int macb_mii_init(struct macb *bp)
 	dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
 
 	np = bp->pdev->dev.of_node;
-	if (np) {
-		if (of_phy_is_fixed_link(np)) {
-			if (of_phy_register_fixed_link(np) < 0) {
-				dev_err(&bp->pdev->dev,
-					"broken fixed-link specification\n");
-				goto err_out_unregister_bus;
-			}
-			bp->phy_node = of_node_get(np);
-
-			err = mdiobus_register(bp->mii_bus);
-		} else {
-			/* try dt phy registration */
-			err = of_mdiobus_register(bp->mii_bus, np);
-
-			/* fallback to standard phy registration if no phy were
-			 * found during dt phy registration
-			 */
-			if (!err && !phy_find_first(bp->mii_bus)) {
-				for (i = 0; i < PHY_MAX_ADDR; i++) {
-					struct phy_device *phydev;
 
-					phydev = mdiobus_scan(bp->mii_bus, i);
-					if (IS_ERR(phydev) &&
-					    PTR_ERR(phydev) != -ENODEV) {
-						err = PTR_ERR(phydev);
-						break;
-					}
-				}
-
-				if (err)
-					goto err_out_unregister_bus;
-			}
-		}
+	if (np) {
+		err = of_mdiobus_register(bp->mii_bus, np);
 	} else {
 		for (i = 0; i < PHY_MAX_ADDR; i++)
 			bp->mii_bus->irq[i] = PHY_POLL;
@@ -610,10 +613,10 @@ static int macb_mii_init(struct macb *bp)
 
 err_out_unregister_bus:
 	mdiobus_unregister(bp->mii_bus);
-err_out_free_mdiobus:
-	of_node_put(bp->phy_node);
 	if (np && of_phy_is_fixed_link(np))
 		of_phy_deregister_fixed_link(np);
+err_out_free_mdiobus:
+	of_node_put(bp->phy_node);
 	mdiobus_free(bp->mii_bus);
 err_out:
 	return err;