linux-kernel - Re: [PATCH 2/2] dt-bindings: net: dsa: mediatek,mt7530: document MDIO-bus

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Message-ID: <04cc2904-6d61-416e-bfbe-c24d96fe261b@lunn.ch>
Date:   Sun, 30 Apr 2023 19:18:01 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     David Bauer <mail@...id-bauer.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Daniel Golle <daniel@...rotopia.org>, 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 2/2] dt-bindings: net: dsa: mediatek,mt7530: document
 MDIO-bus

On Sun, Apr 30, 2023 at 07:17:10PM +0300, Arınç ÜNAL wrote:
> On 30.04.2023 15:34, Arınç ÜNAL wrote:
> > On 30.04.2023 14:28, David Bauer wrote:
> > > Document the ability to add nodes for the MDIO bus connecting the
> > > switch-internal PHYs.
> > 
> > This is quite interesting. Currently the PHY muxing feature for the
> > MT7530 switch looks for some fake ethernet-phy definitions on the
> > mdio-bus where the switch is also defined.
> > 
> > Looking at the binding here, there will be an mdio node under the switch
> > node. This could be useful to define the ethernet-phys for PHY muxing
> > here instead, so we don't waste the register addresses on the parent
> > mdio-bus for fake things. It looks like this should work right out of
> > the box. I will do some tests.
> 
> Once I start using the mdio node it forces me to define all the PHYs which
> were defined as ports.

Try setting ds->slave_mii_bus to the MDIO bus you register via
of_mdiobus_register().

	Andrew