netdev - Re: [PATCH net-next v1] net: phy: tja11xx: add cable-test support

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Message-Id: <20200513.123611.1272910638699127501.davem@davemloft.net>
Date:   Wed, 13 May 2020 12:36:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     o.rempel@...gutronix.de
Cc:     andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        mark.rutland@....com, robh+dt@...nel.org, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        marex@...x.de, david@...tonic.nl, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v1] net: phy: tja11xx: add cable-test support

From: Oleksij Rempel <o.rempel@...gutronix.de>
Date: Wed, 13 May 2020 14:34:40 +0200

> 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 <o.rempel@...gutronix.de>

Applied, thanks.