linux-kernel - Re: [RFC PATCH 08/13] dwmac-meson8b: add support for phy selection

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Message-ID: <20161021160807.GT16974@lunn.ch>
Date:   Fri, 21 Oct 2016 18:08:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     khilman@...libre.com, carlo@...one.org, linus.walleij@...aro.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC PATCH 08/13] dwmac-meson8b: add support for phy selection

Hi Neil

> Yes this would be a good idea if we were able to scan the internal
> and external PHYs at the same time, but with our limited knowledge
> the values we write in the register seems to switch a mux for the
> whole RMII and MDIO signals to either interface.

Ah, O.K. So you need something like:

drivers/net/phy/mdio-mux-mmioreg.c

This seems to be limited to a single byte for the mux register, so you
might need to make some extensions.

      Andrew