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

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Message-ID: <617c51cf-2c09-4865-ac60-96599db597e7@lunn.ch>
Date:   Mon, 14 Aug 2023 15:09:25 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        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

> Ah okay. I didn't consider the switch architecture where the data interface
> of the PHY is connected to the switch, and the PHY management interface is
> connected to the mdio bus that the switch is connected to.

The generic Linux architecture for PHYs and binding them to a MAC via
a phandle allows the PHY to be on any MDIO bus anywhere. DSA has some
additional shortcuts to support 1:1 mapping if the switch has its own
MDIO bus, without describing it in DT, but this is just in addition to
the generic code.

> Not json-schema documentation, don't care about:
> - ar9331.txt
> - lan9303.txt
> - lantiq-gswip.txt
> - marvell.txt

The marvell switch can have up to 2 MDIO busses. If i remember
correctly, there is also one switch which has one MDIO bus per port.

	   Andrew