Re: [RFC PATCH v2 net-next 0/8] Add support for VSC7511-7514 chips over SPI

On Sat, Jul 10, 2021 at 12:25:54PM -0700, Colin Foster wrote:

1. The first probe of the internal MDIO bus fails. I suspect this is related to
power supplies / grounding issues that would not appear on standard hardware.

Where and with what error code does it fail exactly? I don't understand
the concept of "the first probe"? You mean that there is an
-EPROBE_DEFER and it tries again immediately afterwards? Or you need to
unbind and rebind the driver to the device, or what?

2. Communication to the CPU bus doesn't seem to function properly. I suspect
this is due to the fact that ocelot / felix assumes it is using the built-in CPU
/ NPI port for forwarding, though I am not positive.

What is the CPU bus and what doesn't function properly about it?

Nonetheless, these two issues likely won't require a large architecture change,
and perhaps those who know much more about the ocelot chips than I could chime
in.

I guess you don't know if that's the case or not until you know what the
problem is...