linux-kernel - Re: [PATCH net-next v2 3/9] net: phy: Allow PHY drivers to report isolation support

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Message-ID: <20241007122720.2e1eba76@device-21.home>
Date: Mon, 7 Oct 2024 12:27:20 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: 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>, Russell King <linux@...linux.org.uk>,
 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 3/9] net: phy: Allow PHY drivers to report
 isolation support

On Fri, 4 Oct 2024 20:20:10 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > +static bool phy_can_isolate(struct phy_device *phydev)
> > +{
> > +	if (phydev->drv && phydev->drv->can_isolate)
> > +		return phydev->drv->can_isolate(phydev);
> > +
> > +	return true;  
> 
> Reading Russells comment, and the fact that this feature is nearly
> unused, so we have no idea how well PHYs actually support this, i
> would flip the logic. Default to false. A PHY driver needs to actively
> sign up to supporting isolation, with the understanding it has been
> tested on at least one board with two or more PHYs.

Fair point, I'll reverse the logic.

Thanks,

Maxime