netdev - Re: [PATCH net-next v1 0/9] Ethernet Cable test support

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Message-ID: <20200430205651.GH107658@lunn.ch>
Date:   Thu, 30 Apr 2020 22:56:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     Florian Fainelli <f.fainelli@...il.com>, cphealy@...il.com,
        davem@...emloft.net, hkallweit1@...il.com, mkubecek@...e.cz,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 0/9] Ethernet Cable test support

On Thu, Apr 30, 2020 at 10:01:55PM +0200, Michael Walle wrote:
> Oh so, the time delta counter of the Marvell PHY also runs at 125MHz? ;)

No idea. But 125MHz is one of the fundamental clocks rates in
Ethernet, so it make sense to reuse it.

>        /* Accoring to the datasheet the distance to the fault is
>         * DELTA_TIME * 0.824 meters.

A calculation like that pops up in my second set of patches where i
add raw TDR data access.

    Andrew