linux-kernel - Re: [PATCH net-next 0/3] net: phy: dp83822: Add support for changing the MAC series termination

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Message-ID: <6aee57d3-8657-44d6-ac21-9f443ca0924e@lunn.ch>
Date: Fri, 7 Mar 2025 14:39:32 +0100
From: Andrew Lunn <andrew@...n.ch>
To: dimitri.fedrau@...bherr.com
Cc: 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>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dimitri Fedrau <dima.fedrau@...il.com>
Subject: Re: [PATCH net-next 0/3] net: phy: dp83822: Add support for changing
 the MAC series termination

On Fri, Mar 07, 2025 at 11:30:00AM +0100, Dimitri Fedrau via B4 Relay wrote:
> The dp83822 provides the possibility to set the resistance value of the
> the MAC series termination. Modifying the resistance to an appropriate
> value can reduce signal reflections and therefore improve signal quality.

I have some dumb questions....

By referring to MAC from the perspective of the PHY, do you mean the
termination of the bus between the MAC and the PHY? The SGMII SERDES,
or RGMII?

I'm assuming the terminology is direct from the datasheet of the PHY?
But since this is a bit of a niche area, no other PHY driver currently
supports anythings like this, the terminology is not well known. So it
would be good to expand the description, to make it really clear what
you are talking about, so if anybody else wants to add the same
feature, they make use of the property, not add a new property.

    Andrew

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