pon., 20 cze 2022 o 20:19 Andrew Lunn [off-list ref] napisał(a):

On Mon, Jun 20, 2022 at 05:02:22PM +0200, Marcin Wojtas wrote:

quoted

Describe the Distributed Switch Architecture (DSA) - compliant
MDIO devices. In ACPI world they are represented as children
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].

I would say this is too limiting. In the DT world, they are not
limited to MDIO children. They can be I2C children, SPI children
etc. There are plenty of I2C switches and SPI switches. This is
actually something we got wrong with the first DT binding. We simply
translated the platform data in DT, and at that time, there was only
MDIO switches supported. That was a real blocker to I2C, SPI and MMIO
devices until we discarded the DT binding and had a second go.

DSA switches are just devices on a bus, any sort of bus.

Look at Documentation/devicetree/binding/net/dsa/dsa.yaml. There is no
reference to MDIO.

I would expect the same with ACPI. Somehow the bus enumerates and
instantiates a device on the bus. The device then registers itself
with the DSA core. The DSA core does not care what sort of bus it is
on, that is the drivers problem.

Thanks for mentioning the other options. It makes things easier and
the MDIO as current strict dependency will be dropped.

Best regards,
Marcin