linux-kernel - Re: [PATCH 0/2] net: phy: dp83822: Add support for line class driver configuration

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Message-ID: <261cb91c-eb3a-4612-93ad-25e2bc1a7c23@lunn.ch>
Date:   Mon, 10 Jul 2023 20:38:08 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vesa Jääskeläinen 
        <vesa.jaaskelainen@...sala.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Davis <afd@...com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] net: phy: dp83822: Add support for line class driver
 configuration

On Mon, Jul 10, 2023 at 08:56:18PM +0300, Vesa Jääskeläinen wrote:
> Add support to specify either class A or class B (default) for line driver.
> 
> Class A: full MLT-3 on both Tx+ and Tx–
> Class B: reduced MLT-3
> 
> By default the PHY is in Class B mode.

Hi Vesa

Do you have a reference to 802.3 or some other document which
describes these. How does reduced differ from full? Is this really a
hardware property of the board?

Thanks
	Andrew