net: dsa: b53: Add BCM7445 quirk
The Broadcom BCM7445 STB chip has an issued in its revision D0 which was previously worked around in drivers/net/dsa/bcm_sf2.c where we may end-up double programming the integrated BCM7445 switch (bcm_sf2) and an external Broadcom switch such as BCM53125, since these are mostly register compatible. Add a small quirk which just defers probing until we are sitting on the slave DSA MDIO bus, which will allow us to intercept reads/writes and funnel them through the SF2 internal MDIO master (which happens to disconnect its pseudo PHY). Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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