[PATCH net-next] net: ti: davinci_emac: stop using bus type mdio_bus_type

[Heiner Kallweit <hkallweit1@gmail.com>]

This driver is the only user of mdio_bus_type outside phylib.
Using mdio_bus_type isn't strictly needed here, so use an alternative
approach. This will allow to make mdio_bus_type private to phylib
in a follow-up series.

Compile-tested only.

Note: Devices supported by this driver are OF-only, therefore the string
      comparison in match_first_device() isn't needed any longer.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/ti/davinci_emac.c | 39 ++++++++++----------------
 1 file changed, 15 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index 22d14fa5fe3..052ecd83f80 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1389,15 +1389,6 @@ static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
 		return -EOPNOTSUPP;
 }
 
-static int match_first_device(struct device *dev, const void *data)
-{
-	if (dev->parent && dev->parent->of_node)
-		return of_device_is_compatible(dev->parent->of_node,
-					       "ti,davinci_mdio");
-
-	return !strncmp(dev_name(dev), "davinci_mdio", 12);
-}
-
 /**
  * emac_dev_open - EMAC device open
  * @ndev: The DaVinci EMAC network adapter
@@ -1417,7 +1408,6 @@ static int emac_dev_open(struct net_device *ndev)
 	int i = 0;
 	struct emac_priv *priv = netdev_priv(ndev);
 	struct phy_device *phydev = NULL;
-	struct device *phy = NULL;
 
 	ret = pm_runtime_resume_and_get(&priv->pdev->dev);
 	if (ret < 0) {
@@ -1502,20 +1492,22 @@ static int emac_dev_open(struct net_device *ndev)
 		}
 	}
 
-	/* use the first phy on the bus if pdata did not give us a phy id */
+	/* if no phy-handle and no fixed link, use the first phy on the bus */
 	if (!phydev && !priv->phy_id) {
-		/* NOTE: we can't use bus_find_device_by_name() here because
-		 * the device name is not guaranteed to be 'davinci_mdio'. On
-		 * some systems it can be 'davinci_mdio.0' so we need to use
-		 * strncmp() against the first part of the string to correctly
-		 * match it.
-		 */
-		phy = bus_find_device(&mdio_bus_type, NULL, NULL,
-				      match_first_device);
-		if (phy) {
-			priv->phy_id = dev_name(phy);
-			if (!priv->phy_id || !*priv->phy_id)
-				put_device(phy);
+		struct device_node *np;
+
+		np = of_find_compatible_node(NULL, NULL, "ti,davinci_mdio");
+		if (np) {
+			struct mii_bus *bus = of_mdio_find_bus(np);
+
+			if (bus) {
+				struct phy_device *phy = phy_find_first(bus);
+
+				if (phy)
+					priv->phy_id = phydev_name(phy);
+				put_device(&bus->dev); /* of_mdio_find_bus */
+			}
+			of_node_put(np); /* of_find_compatible_node */
 		}
 	}
 
@@ -1523,7 +1515,6 @@ static int emac_dev_open(struct net_device *ndev)
 		phydev = phy_connect(ndev, priv->phy_id,
 				     &emac_adjust_link,
 				     PHY_INTERFACE_MODE_MII);
-		put_device(phy);	/* reference taken by bus_find_device */
 		if (IS_ERR(phydev)) {
 			dev_err(emac_dev, "could not connect to phy %s\n",
 				priv->phy_id);
-- 
2.53.0