davinci_emac: pass ioctls through to phy device.

The DaVinci EMAC driver does not implement any ioctls, but still it can
pass them through to the phy device. This makes it possible for a phy
to offer PHC capabilities.

Cc: Anant Gole <anantgole@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>

drivers/net/davinci_emac.c

@@ -1489,14 +1489,14 @@ static void emac_adjust_link(struct net_device *ndev)
  */
 static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
 {
-	dev_warn(&ndev->dev, "DaVinci EMAC: ioctl not supported\n");
+	struct emac_priv *priv = netdev_priv(ndev);
 
 	if (!(netif_running(ndev)))
 		return -EINVAL;
 
 	/* TODO: Add phy read and write and private statistics get feature */
 
-	return -EOPNOTSUPP;
+	return phy_mii_ioctl(priv->phydev, ifrq, cmd);
 }
 
 static int match_first_device(struct device *dev, void *data)