linux-kernel - Re: [RFC PATCH v2 2/2] net: mdio: rtl9300: setup PHY polling registers

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Message-ID: <aXJLG8cPKqseTbDK@makrotopia.org>
Date: Thu, 22 Jan 2026 16:06:51 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
	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,
	Jonas Jelonek <jelonek.jonas@...il.com>,
	Markus Stockhausen <markus.stockhausen@....de>
Subject: Re: [RFC PATCH v2 2/2] net: mdio: rtl9300: setup PHY polling
 registers

On Thu, Jan 22, 2026 at 02:46:58PM +0100, Andrew Lunn wrote:
> > Only a small subset has been seen in the wild inside RealTek switches
> > for now. Most, of course, come with RealTek switches. However, it is
> > only very recently that RealTek offers 10G PHYs, so before vendors
> > were using 10G PHYs of other vendors, in practise I've only seen
> > Aquantia.
> 
> ...
> 
> > Yes, that does sound better, especially with your concern about
> > ->supported mask not necessarily being correct at probe time in mind.
> 
> FYI: The Aquantia PHYs are particularly bad with ->supported.

Yes, but the PHY driver takes care of that and implements fixes via a
custom .get_features op. That's precisely why I'd like the MDIO polling
controller to rely on what the PHY driver has "discovered" and set in
->supported, instead of doing all that in duplicate open-coded MDIO bus
scanning and PHY probing in the MDIO driver, which is exactly why I
believe we should have API for that.