netdev - TJA1100 100Base-T1 PHY features via ethtool?

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Date:   Mon, 13 Aug 2018 21:35:09 +0200
From:   Michael Grzeschik <mgr@...gutronix.de>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kernel@...gutronix.de
Subject: TJA1100 100Base-T1 PHY features via ethtool?

Hi David,

I use a special 100Base-T1 phy (NXP TJA1100 [1]) that has some features
like:

- enabling/disabling test modes
- fault detection
- switching managed/autonomous mode
- signal quality indication
- ...

I already implemented the support of the features with the
ethtool --get/set-phy-tunables features by adding ethtool_phy_tunables:

ETHTOOL_PHY_TEST_MODE
ETHTOOL_PHY_FAULT_DETECTION
ETHTOOL_PHY_MANAGED_MODE
ETHTOOL_PHY_SIGNAL_QUALITY

Before posting my series I wanted to ensure that this is the preferred
interface for those options.

I found a series from 2016 [2] that implements the userspace part for
the loopback feature of some phys, that did not get mainline so far
which makes me wonder if ethtool is still the way to go.

[1] https://www.nxp.com/docs/en/data-sheet/TJA1100.pdf
[2] https://www.spinics.net/lists/netdev/msg406614.html

Thanks,
Michael

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