On Fri, Mar 19, 2021 at 04:56PM +0800, Russell King - ARM Linux admin wrote:
On Fri, Mar 19, 2021 at 08:40:45AM +0100, Heiner Kallweit wrote:
Is there a specific reason why c22 is probed first? Reversing the order would solve the issue we speak about here. c45-probing of c22-only PHY's shouldn't return false positives (at least at a first glance).
That would likely cause problems for the I2f MDIO driver, since a C45 read is indistinguishable from a C22 write on the I2C bus.
Hi Russell,
STMMAC is capable of supporting external PHYs that accessible using C22 or C45.
Accordng to patch [1] send earlier, it should solve the problem.
As for any other drivers, if it is not using MDIOBUS_C45_C22, It should still work as it is by using MDIOBUS_C22.
[1] https://lkml.org/lkml/2020/11/9/443
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