netdev - Re: [PATCH RFC] Providing a helper for PCS inband negotiation

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Date: Mon, 15 May 2023 15:58:09 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Daniel Machon <daniel.machon@...rochip.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Felix Fietkau <nbd@....name>,
	Florian Fainelli <f.fainelli@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Ioana Ciornei <ioana.ciornei@....com>,
	Jakub Kicinski <kuba@...nel.org>, John Crispin <john@...ozen.org>,
	Jose Abreu <Jose.Abreu@...opsys.com>,
	Lars Povlsen <lars.povlsen@...rochip.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Marcin Wojtas <mw@...ihalf.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Paolo Abeni <pabeni@...hat.com>, Sean Wang <sean.wang@...iatek.com>,
	Steen Hegelund <Steen.Hegelund@...rochip.com>,
	Taras Chornyi <taras.chornyi@...ision.eu>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	UNGLinuxDriver@...rochip.com, Vladimir Oltean <olteanv@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC] Providing a helper for PCS inband negotiation

> 2. XLGMII.. Looking at the XPCS driver, it's unclear whether Clause 73
>    AN gets used for this. A quick scan of IEEE 802.3 suggests that
>    XLGMII doesn't have any support for any inband signalling, and it's
>    just an intermediary protocol between the MAC (more specifically the
>    RS, but for the purposes of this I'll just refer to MAC) and the
>    attached PCS, and any autonegotiation happens after the XLGMII link.

So isn't XLGMII then a generic PHY thing, not a phylink thing?

Or am i not correctly understanding how
drivers/phy/marvell/phy-*-comphy.c and
drivers/phy/microchip/*_serdev.c fit into the overall picture?

	Andrew