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

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Message-ID: <a6c6fe83-fbb5-f289-2210-6f1db6585636@arinc9.com>
Date:   Sun, 30 Apr 2023 21:28:26 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Andrew Lunn <andrew@...n.ch>
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 30.04.2023 20:18, Andrew Lunn wrote:
> 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().

That seems to be the case already, under mt7530_setup_mdio():

	bus = devm_mdiobus_alloc(dev);
	if (!bus)
		return -ENOMEM;

	ds->slave_mii_bus = bus;

The bus is registered with devm_of_mdiobus_register(), if that matters. 
(My current knowledge about OF or OF helpers for MDIO is next to nothing.)

The same behaviour is there.

Arınç