+	} else if (port->not_described) {
+		/* This PHY can do combo-ports, i.e. 2 MDI outputs, usually one
+		 * of them going to an SFP and the other one to a RJ45
+		 * connector. If we don't have any representation for the port
+		 * in DT, and we are dealing with a non-SFP port, then we
+		 * mask the port's capabilities to report BaseT-only modes
+		 */
+		port->mediums = BIT(ETHTOOL_LINK_MEDIUM_BASET);
+
+		phy_port_filter_supported(port);

That seems a little bit error prone. Maybe add a helper to set
port->mediums, which also makes the phy_port_filter_supported() call?

	Andrew