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Date:   Wed, 13 May 2020 12:34:27 -0700
From:   Florian Fainelli <>
To:     Oleksij Rempel <>,
        Andrew Lunn <>,
        Heiner Kallweit <>,
        Mark Rutland <>,
        Rob Herring <>
Cc:     Pengutronix Kernel Team <>,,
        "David S. Miller" <>,,
        Marek Vasut <>, David Jander <>,
Subject: Re: [PATCH net-next v1] net: phy: tja11xx: add cable-test support

On 5/13/2020 5:34 AM, Oleksij Rempel wrote:
> Add initial cable testing support.
> This PHY needs only 100usec for this test and it is recommended to run it
> before the link is up. For now, provide at least ethtool support, so it
> can be tested by more developers.
> This patch was tested with TJA1102 PHY with following results:
> - No cable, is detected as open
> - 1m cable, with no connected other end and detected as open
> - a 40m cable (out of spec, max lenght should be 15m) is detected as OK.
> Current patch do not provide polarity test support. This test would
> indicate not proper wire connection, where "+" wire of main phy is
> connected to the "-" wire of the link partner.
> Signed-off-by: Oleksij Rempel <>

Reviewed-by: Florian Fainelli <>

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