On Wed, 17 Feb 2021 at 13:19, Andrew Lunn <and...@lunn.ch> wrote: > > > > The patch does make sense though, Broadcom 53125 switches have a broken > > > turn around and are mdio_device instances, the broken behavior may not > > > show up with all MDIO controllers used to interface though. For the > > > > Yes the reason we needed this change was to enable broken turn around, > > specifically with a Marvell 88E6390. > > Ah, odd. I've never had problems with the 6390, either connected to a > Freecale FEC, or the Linux bit banging MDIO bus. > > What are you using for an MDIO bus controller? Did it already support > broken turn around, or did you need to add it?
Using bit bang MDIO to access the 88e6390. I suspect the issue is specific to the board design, another similar design we have uses bit bang MDIO but a 88e6193x switch and does not have any issue with turn around. Regards, Nathan
