netdev - Re: [PATCH 1/3 net-next v3] net: ethernet: ixp4xx: Add DT bindings

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Date:   Sun, 25 Apr 2021 02:37:10 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>, netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Zoltan HERPAI <wigyori@...0.hu>,
        Raylynn Knight <rayknight@...com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/3 net-next v3] net: ethernet: ixp4xx: Add DT bindings

On Sun, Apr 25, 2021 at 02:24:26AM +0200, Linus Walleij wrote:
> On Fri, Apr 23, 2021 at 4:49 PM Andrew Lunn <andrew@...n.ch> wrote:
> 
> > (...) it should be impossible for multiple devices to
> > instantiate an MDIO bus. But with device tree, is that still true?
> > Should there be validation that only one device has an MDIO bus in its
> > device tree?
> 
> This would be more of a question to Rob.

Hi Linus

Sorry. I was thinking C code. The driver already has the global
variable mdio_bus. It is initially a NULL pointer. It gets sent when
the first MDIO bus driver probes. If it is not NULL when an MDIO bus
driver probes, throw an error.

       Andrew