On 2018/11/9 7:23, Andrew Lunn wrote:

I'm just trying to ensure whatever is defined is flexible enough that
we really can later support everything which DT does. We have PHYs on
MDIO busses, inside switches, which are on MDIO busses, which are
inside Ethernet interfaces, etc.

An MDIO bus is very similar to an i2c bus. How is that described in
ACPI? Anything we can learn from that?

All the documents I've seen are from UEFII/ACPICA and I have not seen any
independent description of MDIO in the ACPI documents. Maybe I missed a
document, too.

I think not all devices need to be described in ACPI. The ACPI defines what
should be included in a device, as well as some special definitions. Our
MDIO
doesn't need a special definition, because it's enough to use a generic ACPI
description. I think that's why MDIO doesn't have a separate description.

Cheers,
Dongsheng