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

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Message-ID: <b3edd0fe-af28-4ae5-a584-7cbaba8b2e06@arinc9.com>
Date:   Sun, 27 Aug 2023 11:38:07 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Andrew Lunn <andrew@...n.ch>
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

On 14.08.2023 16:09, Andrew Lunn wrote:
>> 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.

Understood.

> 
>> 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.

I will work on writing a schema for these once I'm done with this.

Arınç