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

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Date:   Sun, 13 Aug 2023 22:01:57 +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 Sun, Aug 13, 2023 at 03:59:11PM +0300, Arınç ÜNAL wrote:
> > sja1105 does not support an "mdio" child property. I haven't checked the
> > others. Don't add properties that aren't supported.
> 
> Adding the mdio property to the dsa.yaml schema will allow it on all of the
> schemas that refer to dsa.yaml such as this one. This addition here is only
> to disallow additional properties under the mdio property for this specific
> schema.
> 
> That said, my understanding is that the internal MDIO bus exists on all of
> the switches controlled by DSA.

How come?

> Whether each individual DSA subdriver supports registering it does not
> matter in terms of documenting the internal MDIO bus for all DSA
> switches.
> 
> SJA1110 uses the mdios property instead because it's got two internal mdio
> buses, which is why I invalidate the mdio property for it. If SJA1105 has
> also got two internal mdio buses, let me know.

SJA1105 has zero internal MDIO buses and zero internal PHYs.