drivers: net: cpsw: use of_phy_connect() in fixed-link case

If a fixed-link DT subnode is used, the phy_device was looked up so
that a PHY ID string could be constructed and passed to phy_connect().
This is not necessary, as the device_node can be passed directly to
of_phy_connect() instead. This reuses the same codepath as if the
phy-handle DT property was used.

Signed-off-by: David Rivshin <drivshin@allworx.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -2048,22 +2048,13 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
 				"slave[%d] using phy-handle=\"%s\"\n",
 				i, slave_data->phy_node->full_name);
 		} else if (of_phy_is_fixed_link(slave_node)) {
-			struct device_node *phy_node;
-			struct phy_device *phy_dev;
-
 			/* In the case of a fixed PHY, the DT node associated
 			 * to the PHY is the Ethernet MAC DT node.
 			 */
 			ret = of_phy_register_fixed_link(slave_node);
 			if (ret)
 				return ret;
-			phy_node = of_node_get(slave_node);
-			phy_dev = of_phy_find_device(phy_node);
-			if (!phy_dev)
-				return -ENODEV;
-			snprintf(slave_data->phy_id, sizeof(slave_data->phy_id),
-				 PHY_ID_FMT, phy_dev->mdio.bus->id,
-				 phy_dev->mdio.addr);
+			slave_data->phy_node = of_node_get(slave_node);
 		} else if (parp) {
 			u32 phyid;
 			struct device_node *mdio_node;