On Tue, Dec 02, 2025 at 01:38:21PM +0100, Paolo Abeni wrote:

On 11/28/25 2:53 PM, Buday Csaba wrote:

quoted

When the ID of an Ethernet PHY is not provided by the 'compatible'
string in the device tree, its actual ID is read via the MDIO bus.
For some PHYs this could be unsafe, since a hard reset may be
necessary to safely access the MDIO registers.

Add a fallback mechanism for such devices: when reading the ID
fails, the reset will be asserted, and the ID read is retried.

This allows such devices to be used with an autodetected ID.

The fallback mechanism is activated in the error handling path, and
the return code of fwnode_mdiobus_register_phy() is unaltered, except
when the reset fails with -EPROBE_DEFER, which is propagated to the
caller.

Signed-off-by: Buday Csaba <redacted>

IMHO this deserves an explicit ack from phy maintainers. Unless such ack
is going to land on the ML very soon, I suggest to defer this patch to
the next cycle, as Jakub is wrapping the net-next PR.

No time to do anything quickly, sorry.

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