netdev - Re: [PATCH RFC net-next 4/5] dt-bindings: net: dsa: mt7530: Add mediatek,ephy-handle to isolate ext. phy

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Date:   Mon, 24 Jun 2019 14:56:50 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     René van Dorst <opensource@...rst.com>,
        sean.wang@...iatek.com, linux@...linux.org.uk, davem@...emloft.net,
        matthias.bgg@...il.com, andrew@...n.ch, vivien.didelot@...il.com
Cc:     frank-w@...lic-files.de, netdev@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH RFC net-next 4/5] dt-bindings: net: dsa: mt7530: Add
 mediatek,ephy-handle to isolate ext. phy

On 6/24/19 7:52 AM, René van Dorst wrote:
> On some platforum the external phy can only interface to the port 5 of the
> switch because the RGMII TX and RX lines are swapped. But it still can be
> useful to use the internal phy of the switch to act as a WAN port which
> connectes to the 2nd GMAC. This gives WAN port dedicated bandwidth to
> the SOC. This increases the LAN and WAN routing.
> 
> By adding the optional property mediatek,ephy-handle, the external phy
> is put in isolation mode when internal phy is connected to 2nd GMAC via
> phy-handle property.

Most platforms we have seen so far implement this logic with a mdio-mux,
can you see if that is possible here? stmmac has plenty of examples like
those.
-- 
Florian