net: dsa: felix: allow serdes configuration for dsa ports

Ports for Ocelot devices (VSC7511, VSC7512, VSC7513 and VSC7514) support
external phys. When external phys are used, additional configuration on
each port is required to enable QSGMII mode and set external phy modes.

Add a configurable hook into these routines, so the external ports can be
used.
Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -1585,6 +1585,10 @@ static int felix_setup(struct dsa_switch *ds)
 	dsa_switch_for_each_available_port(dp, ds) {
 		ocelot_init_port(ocelot, dp->index);
 
+		if (felix->info->configure_serdes)
+			felix->info->configure_serdes(ocelot, dp->index,
+						      dp->dn);
+
 		/* Set the default QoS Classification based on PCP and DEI
 		 * bits of vlan tag.
 		 */

drivers/net/dsa/ocelot/felix.h

@@ -15,6 +15,8 @@
 #define OCELOT_PORT_MODE_USXGMII	BIT(4)
 #define OCELOT_PORT_MODE_1000BASEX	BIT(5)
 
+struct device_node;
+
 /* Platform-specific information */
 struct felix_info {
 	/* Hardcoded resources provided by the hardware instantiation. */
@@ -61,6 +63,8 @@ struct felix_info {
 	void	(*phylink_mac_config)(struct ocelot *ocelot, int port,
 				      unsigned int mode,
 				      const struct phylink_link_state *state);
+	int	(*configure_serdes)(struct ocelot *ocelot, int port,
+				    struct device_node *portnp);
 };
 
 /* Methods for initializing the hardware resources specific to a tagging