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

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Date:   Wed, 13 Sep 2023 15:44:03 +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 13.09.2023 04:21, Andrew Lunn wrote:
>>> 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'm writing the json-schema for Marvell switches. I've checked a few
>> devicetree source files on Linus's Linux tree, I only see two buses used at
>> the most.
> 
> Sorry, i was ambiguous. Its not a Marvell switch which can have one
> MDIO bus per port. I don't remember which switch it is, and it might
> be a pure switchdev switch, not a DSA switch.
> 
>> The internal bus and another bus with
>> marvell,mv88e6xxx-mdio-external. I've never seen a devicetree with
>> marvell,mv88e6250 though. Could the switch that has one MDIO bus per port
>> be this one? Also, is every bus of this switch a
>> marvell,mv88e6xxx-mdio-external bus or, one internal bus and the remaining
>> are marvell mv88e6xxx-mdio-external buses?
> 
> Only the 6390 family has two busses. It has an internal MDIO bus with
> the same register API as all the other switches. However, unlike the
> other families, it is not exposed on pins. And the 6390 has a second
> MDIO bus using a slight variant of the registers, which is connected
> to the outside world via pins. This second bus then has a compatible
> to separate it from the normal MDIO bus.

OK, I will disallow the external mdio bus for the compatible strings other
than marvell,mv88e6190.

Arınç