linux-kernel - Re: [PATCH net-next v2 0/9] Allow isolating PHY devices

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Message-ID: <025dc294-2d81-4817-8ec6-7939f1dd8827@lunn.ch>
Date: Mon, 7 Oct 2024 18:43:41 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com, 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>,
	Marek Behún <kabel@...nel.org>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>
Subject: Re: [PATCH net-next v2 0/9] Allow isolating PHY devices

> Looking at 802.3, there is no support for isolation in the clause 45
> register set - the isolate bit only appears in the clause 22 BMCR.
> Clause 22 registers are optional for clause 45 PHYs.

That was also an observation i had, the code goes straight to C22
operations, without even considering if the PHY has phydev->is_c45 is
set.  I think we need an op for this, which will default to NULL. The
driver can then opt-in by using the genphy function, or its own driver
method.

But lets get the big picture understood first, before we focus on the
details.

	Andrew