linux-kernel - Re: [PATCH v3 4/4] net: phy: marvell-88q2xxx: add driver for the Marvell 88Q2220 PHY

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Date: Tue, 2 Jan 2024 11:36:47 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
Cc: Dimitri Fedrau <dima.fedrau@...il.com>,
	Stefan Eichenberger <eichest@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] net: phy: marvell-88q2xxx: add driver for the
 Marvell 88Q2220 PHY

On Thu, Dec 21, 2023 at 03:25:56PM +0100, Andrew Lunn wrote:
> > Without setting the master-slave option it didn't work. I think its
> > mandatory.
> 
> I don't think it is. The PHY should have a default setting for
> master-slave. Often its based on the typical use case. If its
> typically inside a switch, then it should default to prefer-master. If
> its typically in an end system, then it should be prefer-slave.

However, master/slave needs autoneg, and if autoneg is disabled, then
that may not be resolvable, and it may need manual configuration.

-- 
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