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Date:   Mon, 11 May 2020 21:54:35 +0200
From:   Andrew Lunn <>
To:     Christian Herber <>
Cc:     Oleksij Rempel <>,
        "David S. Miller" <>,
        Florian Fainelli <>,
        Heiner Kallweit <>,
        Jakub Kicinski <>,
        Jonathan Corbet <>,
        Michal Kubecek <>,
        David Jander <>,
        "" <>,
        "" <>,
        "" <>,
        Russell King <>,
        "" <>,
        Marek Vasut <>
Subject: Re: Re: signal quality and cable diagnostic

On Mon, May 11, 2020 at 07:32:05PM +0000, Christian Herber wrote:
> On May 11, 2020 4:33:53 PM Andrew Lunn <> wrote:
> >
> > Are the classes part of the Open Alliance specification? Ideally we
> > want to report something standardized, not something proprietary to
> > NXP.
> >
> >        Andrew
> Hi Andrew,

> Such mechanisms are standardized and supported by pretty much all
> devices in the market. The Open Alliance specification is publicly
> available here:
> As the specification is newer than the 100BASE-T1 spec, do not
> expect first generation devices to follow the register definitions
> as per Open Alliance. But for future devices, also registers should
> be same across different vendors.

Hi Christian

Since we are talking about a kernel/user API definition here, i don't
care about the exact registers. What is important is the
naming/representation of the information. It seems like NXP uses Class
A - Class H, where as the standard calls them SQI=0 - SQI=7. So we
should name the KAPI based on the standard, not what NXP calls them.


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