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

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Message-ID: <20230905111127.hql3pjlrtqc7gybv@skbuf>
Date:   Tue, 5 Sep 2023 14:11:27 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Luiz Angelo Daros de Luca <luizluca@...il.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        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, Sep 04, 2023 at 11:42:19PM -0300, Luiz Angelo Daros de Luca wrote:
> > > [1] ...this. The SMI-controlled and MDIO-controlled Realtek switches are
> > > otherwise the same, right? So why would they have different dt-bindings?
> >
> > Honestly, I'm wondering the answer to this as well. For some reason, when
> > probing the SMI controlled Realtek switches, instead of just letting
> > dsa_switch_setup() populate ds->slave_mii_bus, on realtek_smi_setup_mdio()
> > on realtek-smi.c:
> >
> > - priv->slave_mii_bus is allocated.
> > - mdio_np = of_get_compatible_child(priv->dev->of_node, "realtek,smi-mdio");
> > - priv->slave_mii_bus->dev.of_node = mdio_np;
> > - ds->slave_mii_bus = priv->slave_mii_bus;
> 
> I might be able to help here. The Realtek SMI version created a custom
> slave_mii driver because it was the only way to associate it with an
> MDIO DT node. And that DT node was required to specify the interrupts
> for each phy0.
> It would work without that mdio node, letting DSA setup handle the
> slave bus, but it would rely only on polling for port status.

It is possible to set up PHY IRQs even if the MDIO bus is not OF-based.
I think that mv88e6xxx_g2_irq_mdio_setup() does that (sets bus->irq[]).