On 31.3.2026 13:29, Russell King (Oracle) wrote:

On Tue, Mar 31, 2026 at 12:46:26AM +0200, Nicolai Buchwitz wrote:

quoted

Implement the standard ETHTOOL_PHY_DOWNSHIFT tunable for the LAN88xx
PHY. This allows runtime configuration of the auto-downshift feature
via ethtool:

  ethtool --set-phy-tunable eth0 downshift on count 3

The LAN88xx PHY supports downshifting from 1000BASE-T to 100BASE-TX
after 2-5 failed auto-negotiation attempts. Valid count values are
2, 3, 4 and 5.

This is based on an earlier downstream implementation by Phil Elwell.

Signed-off-by: Nicolai Buchwitz <redacted>

I didn't see a cover message. Please always include a cover message 
with
patch series.

Apparently the cover message [1] was sent with slightly different 
recipients (although it was a single git send-email with 
--cc-cmd='scripts/get_maintainer.pl --norolestats').

Reviewed-by: Russell King (Oracle) <redacted>

Thanks, I will add it to the patch.

Nicolai

Thanks!

[1] 
https://lore.kernel.org/netdev/20260330224630.579937-1-nb@tipi-net.de/ (local)