net: phy: micrel: Try default PHY ofnode first

The phydev structure has a PHY OF node pointer in it, use that OF node
first when looking up PHY OF node properties, since that is likely the
correct PHY OF node pointer. If the pointer is not valid, which is the
case e.g. on legacy DTs, fall back to parsing MAC ethernet-phy subnode.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Ramon Fried <rfried.dev@gmail.com>

drivers/net/phy/micrel_ksz90x1.c

@@ -120,8 +120,13 @@ static int ksz90x1_of_config_group(struct phy_device *phydev,
 	if (!drv || !drv->writeext)
 		return -EOPNOTSUPP;
 
-	/* Look for a PHY node under the Ethernet node */
-	node = dev_read_subnode(dev, "ethernet-phy");
+	node = phydev->node;
+
+	if (!ofnode_valid(node)) {
+		/* Look for a PHY node under the Ethernet node */
+		node = dev_read_subnode(dev, "ethernet-phy");
+	}
+
 	if (!ofnode_valid(node)) {
 		/* No node found, look in the Ethernet node */
 		node = dev_ofnode(dev);