|LAN9303 Ethernet switch driver
|The LAN9303 is a three port 10/100 Mbps ethernet switch with integrated phys for
|the two external ethernet ports. The third port is an RMII/MII interface to a
|host master network interface (e.g. fixed link).
|The driver is implemented as a DSA driver, see
|See Documentation/devicetree/bindings/net/dsa/lan9303.txt for device tree
|The LAN9303 can be managed both via MDIO and I2C, both supported by this driver.
|At startup the driver configures the device to provide two separate network
|interfaces (which is the default state of a DSA device). Due to HW limitations,
|no HW MAC learning takes place in this mode.
|When both user ports are joined to the same bridge, the normal HW MAC learning
|is enabled. This means that unicast traffic is forwarded in HW. Broadcast and
|multicast is flooded in HW. STP is also supported in this mode. The driver
|support fdb/mdb operations as well, meaning IGMP snooping is supported.
|If one of the user ports leave the bridge, the ports goes back to the initial
| - Support for VLAN filtering is not implemented
| - The HW does not support VLAN-specific fdb entries