Re: [PATCH v2 1/5] dt-bindings: remoteproc: sse710: Add the External Systems remote processors

Abdellatif El Khlifi
2024-09-19T14:59:14Z

Hi Krzysztof,

> >>> + '#extsys-id':
> >>
> >> '#' is not correct for sure, that's not a cell specifier.
> >>
> >> But anyway, we do not accept in general instance IDs.
> >
> > I'm happy to replace the instance ID with another solution.
> > In our case the remoteproc instance does not have a base address
> > to use. So, we can't put remoteproc@address
> >
> > What do you recommend in this case please ?
>
> Waiting one month to respond is a great way to drop all context from my
> memory. The emails are not even available for me - gone from inbox.
>
> Bus addressing could note it. Or you have different devices, so
> different compatibles. Tricky to say, because you did not describe the
> hardware really and it's one month later...
>

Sorry for waiting. I was in holidays.

I'll add more documentation about the external system for more clarity [1].

Basically, Linux runs on the Cortex-A35. The External system is a
Cortex-M core. The Cortex-A35 can not access the memory of the Cortex-M.
It can only control Cortex-M core using the reset control and status registers mapped
in the memory space of the Cortex-A35.

I'll make sure this explanation is added to the binding and commit log for
more clarity.

Thanks for the suggestion regarding supporting multiple instances of the
External system. I will send a new version shortly addressing all comments.

[1]: paragraph 2.3, https://developer.arm.com/documentation/dai0550/D/?lang=en

Kind regards
Abdellatif