linux-kernel - Re: [PATCH net-next v2 2/2] net: dsa: bcm_sf2: Ensure that MDIO diversion is used

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Message-ID: <20200905153729.GG3164319@lunn.ch>
Date:   Sat, 5 Sep 2020 17:37:29 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/2] net: dsa: bcm_sf2: Ensure that MDIO
 diversion is used

On Fri, Sep 04, 2020 at 02:37:30PM -0700, Florian Fainelli wrote:
> Registering our slave MDIO bus outside of the OF infrastructure is
> necessary in order to avoid creating double references of the same
> Device Tree nodes, however it is not sufficient to guarantee that the
> MDIO bus diversion is used because of_phy_connect() will still resolve
> to a valid PHY phandle and it will connect to the PHY using its parent
> MDIO bus which is still the SF2 master MDIO bus. The reason for that is
> because BCM7445 systems were already shipped with a Device Tree blob
> looking like this (irrelevant parts omitted for simplicity):

Hi Florian

Thanks for the extended commit message.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew