linux-kernel - Re: [RFC PATCH net-next 0/7] net: phy: introduce phy numbering

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Message-ID: <e1de6afe-346f-42bf-8f7a-8621c2e26749@lunn.ch>
Date:   Tue, 12 Sep 2023 17:36:56 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Nicolò Veronese <nicveronese@...il.com>,
        thomas.petazzoni@...tlin.com,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [RFC PATCH net-next 0/7] net: phy: introduce phy numbering

> The PHY namespace is for now contained within struct net_device, meaning
> that PHYs that aren't related at all to any net_device wouldn't be
> numbered as of right now. The only case I identified is when a PHY sits
> between 2 DSA switches, but I don't know how relevant this is.

It might be relevant for the CPU port of the switch. The SoC ethernet
with a PHY has its PHY associated to a netdev, and so it can be
managed. However, the CPU port does not have a netdev, so the PHY is a
bit homeless. Phylink gained the ability to manage PHYs which are not
associated to a netdev, so i think it can manage such a PHY. If not,
we assume the PHY is strapped to perform link up and autoneg on power
on, and otherwise leave it alone.

	Andrew