netdev - Re: [PATCH] of: of_mdio: Handle properties for non-phy mdio devices

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Date:   Wed, 17 Feb 2021 14:48:30 +1000
From:   Nathan Rossi <nathan@...hanrossi.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        Nathan Rossi <nathan.rossi@...i.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH] of: of_mdio: Handle properties for non-phy mdio devices

On Wed, 17 Feb 2021 at 13:19, Andrew Lunn <andrew@...n.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