Re: [PATCH net-next] dsa: slave: support phy devices on external MII bus

      /* internal MII */
      mdio {
        switch0phy1@1 {
          reg = <1>;
        };
      };

      /* external MII */
      mdio1 {
        switch0phy0: switch0phy0@0 {
          reg = <0>;
        };

Hi Martin

You are missing a compatible string here. The binding document says:

- mdio?         : Container of PHYs and devices on the external MDIO
                          bus. The node must contains a compatible string of
                          "marvell,mv88e6xxx-mdio-external"

	  Andrew