Re: [PATCH v2 2/2] arm64: dts: qcom: kaanapali: fix traceNoC probe issue

[Leo Yan <leo.yan@arm.com>]

On Mon, Jun 29, 2026 at 10:08:17AM +0800, Jie Gan wrote:

[...]

> Can I fix the issue by adding "arm,primecell-periphid" property. That's
> would be the best temp solution as it avoids breaking the original design of
> both the TraceNoC AMBA driver and interconnect TraceNoC platform driver.

Before proceeding with the "arm,primecell-periphid" property, could you
clarify a bit:

  - For an interconnect TraceNoC, what would be the consequence of
    enabling ATID? Would it simply be a no-op, or are there any side
    effects? Or is the concern that the trace IDs could be exhausted?

  - How can you guarantee that a interconnect TraceNoC will never
    require ATID in the future?

> The TraceNoC device here must be treated as an AMBA device and I am
> continuing to investigate the issue with our hardware team.

> We aim to fix it from hardware perspetive for existing platforms if possible
> and ensure it is fixed in future platforms.

I'm concerned that all of use end up repeatedly fixing similar issues
whenever hardware configurations change or modules are reused in
different topologies.

For example, if future platforms may require ATID support for an
interconnect TraceNoC, then the issue will pop up again.

Thanks,
Leo