On Mon, Jun 20, 2022 at 07:55:44PM +0200, Andrew Lunn wrote:

On Mon, Jun 20, 2022 at 05:02:13PM +0200, Marcin Wojtas wrote:

...

quoted

It turned out that without much hassle it is possible to describe
DSA-compliant switches as child devices of the MDIO busses, which are
responsible for their enumeration based on the standard _ADR fields and
description in _DSD objects under 'device properties' UUID [1].

No surprises there. That is how the DT binding works. And the current
ACPI concept is basically DT in different words. Maybe the more
important question is, is rewording DT in ACPI the correct approach,
or should you bo doing a more native ACPI implementation? I cannot
answer that, you need to ask the ACPI maintainers.

You beat me up to this. I also was about to mention that the problem with such
conversions (like this series does) is not in the code. It's simplest part. The
problem is bindings and how you get them to be a standard (at least de facto).

quoted

Note that for now cascade topology remains unsupported in ACPI world
(based on "dsa" label and "link" property values). It seems to be feasible,
but would extend this patchset due to necessity of of_phandle_iterator
migration to fwnode_. Leave it as a possible future step.

We really do need to ensure this is possible. You are setting an ABI
here, which everybody else in the ACPI world needs to follow. Cascaded
switches is fundamental to DSA, it is the D in DSA. So i would prefer
that you at least define and document the binding for D in DSA and get
it sanity checked by the ACPI people.

-- 
With Best Regards,
Andy Shevchenko