linux-kernel - Re: [PATCH net-next] net: phy: Synchronize c45_ids to phy

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Message-ID: <aDCytj5c4Mn69Y1D@shell.armlinux.org.uk>
Date: Fri, 23 May 2025 18:39:02 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
Cc: Yajun Deng <yajun.deng@...ux.dev>, hkallweit1@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: Synchronize c45_ids to phy_id

On Fri, May 23, 2025 at 03:03:43PM +0200, Andrew Lunn wrote:
> 
> > > The second point has already been made by Russell, there are lots of
> > > 
> > > different C45 IDs, and phylib will try to find a driver based on any
> > > 
> > > of them.
> > 
> > I noticed that. I tested the BCM89890, 88X3310 and 88Q2110 PHY devices,
> > and the ID is always the same in different MMDs.
> 
> Try a Marvel 10G PHY. They have different IDs. It has been speculated
> Marvell licensed part of the PHY from a different vendor, and you see
> the vendors OUI in some locations.

The 88X3310 was listed, but incorrectly as always having the same ID in
each MMD. This is false as stated previously.

Maybe Marvell have updated the 88x3310 to use the same ID throughout
in a later revision, but it certainly is not true with the versions
I have seen.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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