netdev - Re: [PATCH net-next v20 03/14] net: phy: Introduce PHY ports representation

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Message-ID: <e18d4197-b06e-493a-a843-e195fbc46d6c@bootlin.com>
Date: Fri, 28 Nov 2025 09:45:00 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, linux-arm-kernel@...ts.infradead.org,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Herve Codina <herve.codina@...tlin.com>,
 Florian Fainelli <f.fainelli@...il.com>,
 Heiner Kallweit <hkallweit1@...il.com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>,
 Marek Behún <kabel@...nel.org>,
 Oleksij Rempel <o.rempel@...gutronix.de>,
 Nicolò Veronese <nicveronese@...il.com>,
 Simon Horman <horms@...nel.org>, mwojtas@...omium.org,
 Antoine Tenart <atenart@...nel.org>, devicetree@...r.kernel.org,
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Romain Gantois <romain.gantois@...tlin.com>,
 Daniel Golle <daniel@...rotopia.org>,
 Dimitri Fedrau <dimitri.fedrau@...bherr.com>,
 Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH net-next v20 03/14] net: phy: Introduce PHY ports
 representation

Hi Russell,

On 27/11/2025 19:04, Russell King (Oracle) wrote:
> On Thu, Nov 27, 2025 at 06:17:46PM +0100, Maxime Chevallier wrote:
>> Ethernet provides a wide variety of layer 1 protocols and standards for
>> data transmission. The front-facing ports of an interface have their own
>> complexity and configurability.
>>
>> Introduce a representation of these front-facing ports. The current code
>> is minimalistic and only support ports controlled by PHY devices, but
>> the plan is to extend that to SFP as well as raw Ethernet MACs that
>> don't use PHY devices.
>>
>> This minimal port representation allows describing the media and number
>> of pairs of a BaseT port. From that information, we can derive the
>> linkmodes usable on the port, which can be used to limit the
>> capabilities of an interface.
>>
>> For now, the port pairs and medium is derived from devicetree, defined
>> by the PHY driver, or populated with default values (as we assume that
>> all PHYs expose at least one port).
>>
>> The typical example is 100M ethernet. 100BaseT can work using only 2
>> pairs on a Cat 5 cables.
> 
> Correction: 100BASE-TX. 100BASE-T, which covers the family of 100BASE-T
> media, includes 100BASE-T4 which is over all four pairs of the cable.
> 
 As Rob's bot made what appears at a first glance to be incorrect
comments, I'm not sure a resend is on the table yet. Do you want me to
send a v21 with the updated description ? I have the same question about
your comment on patch 2 :)

I'll gladly resend, but that'll be after the 24h cooldown.

Thanks a lot for taking a look a this,

Maxime