net: mscc: ocelot: make phy_mode a member of the common struct ocelot_port

The Ocelot switchdev driver and the Felix DSA one need it for different
reasons. Felix (or at least the VSC9959 instantiation in NXP LS1028A) is
integrated with the traditional NXP Layerscape PCS design which does not
support runtime configuration of SerDes protocol. So it needs to
pre-validate the phy-mode from the device tree and prevent PHYLINK from
attempting to change it. For this, it needs to cache it in a private
variable.
Signed-off-by: NVladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mscc/ocelot.c

@@ -500,13 +500,14 @@ EXPORT_SYMBOL(ocelot_port_enable);
 static int ocelot_port_open(struct net_device *dev)
 {
 	struct ocelot_port_private *priv = netdev_priv(dev);
-	struct ocelot *ocelot = priv->port.ocelot;
+	struct ocelot_port *ocelot_port = &priv->port;
+	struct ocelot *ocelot = ocelot_port->ocelot;
 	int port = priv->chip_port;
 	int err;
 
 	if (priv->serdes) {
 		err = phy_set_mode_ext(priv->serdes, PHY_MODE_ETHERNET,
-				       priv->phy_mode);
+				       ocelot_port->phy_mode);
 		if (err) {
 			netdev_err(dev, "Could not set mode of SerDes\n");
 			return err;
@@ -514,7 +515,7 @@ static int ocelot_port_open(struct net_device *dev)
 	}
 
 	err = phy_connect_direct(dev, priv->phy, &ocelot_port_adjust_link,
-				 priv->phy_mode);
+				 ocelot_port->phy_mode);
 	if (err) {
 		netdev_err(dev, "Could not attach to PHY\n");
 		return err;

drivers/net/ethernet/mscc/ocelot.h

@@ -68,7 +68,6 @@ struct ocelot_port_private {
 
 	u8 vlan_aware;
 
-	phy_interface_t phy_mode;
 	struct phy *serdes;
 
 	struct ocelot_port_tc tc;

drivers/net/ethernet/mscc/ocelot_board.c

@@ -402,9 +402,9 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 
 		of_get_phy_mode(portnp, &phy_mode);
 
-		priv->phy_mode = phy_mode;
+		ocelot_port->phy_mode = phy_mode;
 
-		switch (priv->phy_mode) {
+		switch (ocelot_port->phy_mode) {
 		case PHY_INTERFACE_MODE_NA:
 			continue;
 		case PHY_INTERFACE_MODE_SGMII:

include/soc/mscc/ocelot.h

@@ -420,6 +420,8 @@ struct ocelot_port {
 	u8				ptp_cmd;
 	struct sk_buff_head		tx_skbs;
 	u8				ts_id;
+
+	phy_interface_t			phy_mode;
 };
 
 struct ocelot {