netdev - Re: [net-next] dsa: slave: support phy devices on external MII bus

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Date:   Wed, 18 Oct 2017 21:09:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Martin Hundebøll <mnhu@...vas.dk>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [net-next] dsa: slave: support phy devices on external MII bus

> Yes, but with the caveat already covered today: there is a possible
> problem with having to divert MDIO accesses of a PHY pointed by
> phy-handle towards the internal switch bus because of specific problems
> such as those explained in drivers/net/bcm_sf2.c, I don't mind trying to
> do things smarter or in a different way, but that needs to be something
> possible.

Hi Florian

Are you referring to:

        /* Include the pseudo-PHY address to divert reads towards our
         * workaround. This is only required for 7445D0, since 7445E0
         * disconnects the internal switch pseudo-PHY such that we can use the
         * regular SWITCH_MDIO master controller instead.
         *
         * Here we flag the pseudo PHY as needing special treatment and would
         * otherwise make all other PHY read/writes go to the master MDIO bus
         * controller that comes with this switch backed by the "mdio-unimac"
         * driver.
         */
?

Do you have an example device tree fragment, just to make it clearer?

Thanks
	Andrew