[PATCH v3 3/5] arm64: dts: qcom: kaanapali: fix traceNoC probe issue
Jie Gan
jie.gan at oss.qualcomm.com
Tue Jun 30 06:44:05 PDT 2026
On 6/30/2026 8:53 PM, Konrad Dybcio wrote:
> On 6/30/26 12:36 PM, Jie Gan wrote:
>> The traceNoC node used the "qcom,coresight-tnoc", "arm,primecell"
>> compatible, which places the device on the AMBA bus. The AMBA peripheral
>> ID probing fails on this platform, so the device never probes.
>
> An interested reader would immediately expect an answer to why that's
> the case
>
>> Switch the node to the standalone "qcom,coresight-agtnoc" compatible.
>> Dropping "arm,primecell" makes the device probe through the platform
>> driver instead of the AMBA bus, which resolves the probe failure while
>> keeping it an Aggregator TNOC that retains ATID functionality.
>
> This describes OS behavior. Move your message towards the other
> compatible not depending on reading that ID register.
Thanks for the suggestion, will rephrase the description.
Thanks,
Jie
>
> Konrad
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