linux-kernel - Re: [RFC PATCH 2/2] net: phy: mxl-gpy: add new device tree property to disable SGMII autoneg

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Date: Tue, 16 Apr 2024 15:46:19 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Stefan Eichenberger <eichest@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	lxu@...linear.com, hkallweit1@...il.com, linux@...linux.org.uk,
	michael@...le.cc, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] net: phy: mxl-gpy: add new device tree property
 to disable SGMII autoneg

On Tue, Apr 16, 2024 at 02:10:32PM +0200, Stefan Eichenberger wrote:
> Add a new device tree property to disable SGMII autonegotiation and
> instead use the option to match the SGMII speed to what was negotiated
> on the twisted pair interface (tpi).

Could you explain this is more detail.

SGMII always runs its clocks at 1000Mbps. The MAC needs to duplicate
the symbols 100 times when running at 10Mbs, and 10 times when running
at 100Mbps.

    Andrew