net: bcmgenet: add support for new GENET PHY revision scheme
Starting with GPHY revision G0, the GENET register layout has changed to use the same numbering scheme as the Starfighter 2 switch. This means that GPHY major revision is in bits 15:12, minor in bits 11:8 and patch level is in bits 7:4. Introduce a small heuristic which checks for the old scheme first, tests for the new scheme and finally attempts to catch reserved values and aborts. Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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