drivers: net: ethernet: cpsw: add phy-mode support to cpsw driver

Adding phy-mode support to cpsw driver and updating the cpsw binding
documentation.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 89a4c40..a45f64e 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1554,6 +1554,8 @@
 		if (mac_addr)
 			memcpy(slave_data->mac_addr, mac_addr, ETH_ALEN);
 
+		slave_data->phy_if = of_get_phy_mode(slave_node);
+
 		if (data->dual_emac) {
 			if (of_property_read_u32(slave_node, "dual_emac_res_vlan",
 						 &prop)) {