netdev - Re: [PATCH net-next v2 1/4] net: phy: add the link modes for 1000BASE-T1 Ethernet PHY

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Message-ID: <cad4c420-470d-497a-9a1d-a43654af9a7e@lunn.ch>
Date: Mon, 10 Jul 2023 23:10:17 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Stefan Eichenberger <eichest@...il.com>
Cc: netdev@...r.kernel.org, hkallweit1@...il.com, linux@...linux.org.uk,
	francesco.dolcini@...adex.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net-next v2 1/4] net: phy: add the link modes for
 1000BASE-T1 Ethernet PHY

On Mon, Jul 10, 2023 at 10:58:57PM +0200, Stefan Eichenberger wrote:
> This patch adds the link modes for the 1000BASE-T1 Ethernet PHYs. It
> supports 100BASE-T1/1000BASE-T1 in full duplex mode. So far I could not
> find a 1000BASE-T1 PHY that also supports 10BASE-T1, so this mode is not
> added.

Is this actually needed? Ideally you want to extend
genphy_c45_pma_read_abilities() to look in the PHY registers and
determine what the PHY can do. You should only use .features if it is
impossible to determine the PHY abilities by reading registers.

	   Andrew