Re: [PATCH net-next v2 1/1] net: mdio: reset PHY before attempting to access ID register

[Russell King (Oracle)]

On Tue, Dec 02, 2025 at 01:38:21PM +0100, Paolo Abeni wrote:
> On 11/28/25 2:53 PM, Buday Csaba wrote:
> > 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 <buday.csaba@xxxxxxxxx>
> 
> 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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