netdev - Re: [PATCH net-next 0/8] Improvements for RealTek 2.5G Ethernet PHYs

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Date: Thu, 11 May 2023 02:28:15 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH net-next 0/8] Improvements for RealTek 2.5G Ethernet PHYs

On Thu, May 11, 2023 at 12:53:22AM +0200, Daniel Golle wrote:
> Improve support for RealTek 2.5G Ethernet PHYs (RTL822x series).
> The PHYs can operate with Clause-22 and Clause-45 MDIO.
> 
> When using Clause-45 it is desireable to avoid rate-adapter mode and
> rather have the MAC interface mode follow the PHY speed. The PHYs
> support 2500Base-X for 2500M, and Cisco SGMII for 1000M/100M/10M.

I don't see what clause-45 has to do with this. The driver knows that
both C22 and C45 addresses spaces exists in the hardware. It can do
reads/writes on both. If the bus master does not support C45, C45 over
C22 will be performed by the core.

    Andrew