linux-kernel - Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

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Message-ID: <20230814103951.epdk3bzhkn2h7oul@skbuf>
Date:   Mon, 14 Aug 2023 13:39:51 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Daniel Golle <daniel@...rotopia.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, mithat.guner@...ont.com,
        erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

On Mon, Aug 14, 2023 at 01:06:19PM +0300, Arınç ÜNAL wrote:
> On 13.08.2023 22:02, Vladimir Oltean wrote:
> > On Sun, Aug 13, 2023 at 05:58:57PM +0300, Arınç ÜNAL wrote:
> > > On top of this, I'd argue to document the internal MDIO bus on the
> > > ethernet-switch.yaml schema instead.
> > 
> > Why?
> 
> Because a generic switch can have an internal MDIO bus, it's not specific
> to a DSA controlled switch.
> 
> Arınç

I'm not sure it's that simple. Check out arch/mips/boot/dts/mscc/ocelot.dtsi.
Its switch IP ("mscc,vsc7514-switch") is on the same hierarchical level
with the "mscc,ocelot-miim" nodes (so, not a child), because the MDIO controller
isn't part of the address space of the switching IP. Actually that could equally
be considered true for DSA. Placing the "mdio" node as a child of the switch is
one of the possible options, but it has its limitations and is certainly
not the only one.