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Date: Wed, 24 Jun 2026 16:16:10 +0100
From: Leo Yan <leo.yan@arm.com>
To: Jie Gan <jie.gan@oss.qualcomm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
	Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>,
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Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: kaanapali: fix traceNoC probe
 issue
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In-Reply-To: <25d7d3a1-58e0-4f25-a73a-59a978130c47@oss.qualcomm.com>

On Wed, Jun 24, 2026 at 11:08:32PM +0800, Jie Gan wrote:

[...]

> > Why does it fail ? power management ? hw broken ? Is it really AMBA or
> > do you pretend that to be an AMBA device by faking the CID/PID?
> 
> The CID reads as 0 from the register, which I suspect is a hardware design
> issue. I have not yet confirmed this with the hardware team. As a
> workaround, I provided a fake periphid via a DT property to bypass
> amba_read_periphid.
> 
> 
> Leo commented in other thread:
> >>tnoc.c registers both an AMBA driver and a platform driver. Shouldn't >>it
> >>be registered as a platform device instead?
> 
> The platform driver is intended for the interconnect TraceNoC device and is
> not designed to allocate an ATID. The issue is that the TPDM device borrows
> the ATID from the TraceNoC device, resulting in the ATID always being 0 when
> associated with an interconnect NoC device.
> 
> However, I believe it is acceptable to allocate an ATID for the itNoC device
> and the issue can be fixed with this way.

I think so.