net: mv643xx_eth: Fetch the phy connection type from DT

The MAC is capable of RGMII mode and that is probably a more typical
connection type than GMII today (eg it is used by Marvell Reference
designs for several SOCs). Let DT users specify the standard

phy-connection-type = "rgmii-id";

On a phy node.

Signed-off-by: Jason Gunthorpe <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/devicetree/bindings/net/marvell-orion-net.txt

···
 and
 
  - phy-handle: See ethernet.txt file in the same directory.
+ - phy-mode: See ethernet.txt file in the same directory.
 
 or
 

drivers/net/ethernet/marvell/mv643xx_eth.c

···
 	mp->txq_count = pd->tx_queue_count ? : 1;
 }
 
+static int get_phy_mode(struct mv643xx_eth_private *mp)
+{
+	struct device *dev = mp->dev->dev.parent;
+	int iface = -1;
+
+	if (dev->of_node)
+		iface = of_get_phy_mode(dev->of_node);
+
+	/* Historical default if unspecified. We could also read/write
+	 * the interface state in the PSC1
+	 */
+	if (iface < 0)
+		iface = PHY_INTERFACE_MODE_GMII;
+	return iface;
+}
+
 static struct phy_device *phy_scan(struct mv643xx_eth_private *mp,
 				   int phy_addr)
 {
···
 				"orion-mdio-mii", addr);
 
 		phydev = phy_connect(mp->dev, phy_id, mv643xx_eth_adjust_link,
-				PHY_INTERFACE_MODE_GMII);
+				     get_phy_mode(mp));
 		if (!IS_ERR(phydev)) {
 			phy_addr_set(mp, addr);
 			break;
···
 	if (!dev)
 		return -ENOMEM;
 
+	SET_NETDEV_DEV(dev, &pdev->dev);
 	mp = netdev_priv(dev);
 	platform_set_drvdata(pdev, mp);
 
···
 	if (pd->phy_node) {
 		mp->phy = of_phy_connect(mp->dev, pd->phy_node,
 					 mv643xx_eth_adjust_link, 0,
-					 PHY_INTERFACE_MODE_GMII);
+					 get_phy_mode(mp));
 		if (!mp->phy)
 			err = -ENODEV;
 		else
···
 
 	dev->priv_flags |= IFF_UNICAST_FLT;
 	dev->gso_max_segs = MV643XX_MAX_TSO_SEGS;
-
-	SET_NETDEV_DEV(dev, &pdev->dev);
 
 	if (mp->shared->win_protect)
 		wrl(mp, WINDOW_PROTECT(mp->port_num), mp->shared->win_protect);