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From: Jie Gan <jie.gan@oss.qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konradybcio@kernel.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Tingwei Zhang <tingwei.zhang@oss.qualcomm.com>,
	Jingyi Wang <jingyi.wang@oss.qualcomm.com>,
	Abel Vesa <abel.vesa@oss.qualcomm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mike Leach <mike.leach@arm.com>,
	James Clark <james.clark@linaro.org>, Leo Yan <leo.yan@arm.com>,
	Yuanfang Zhang <yuanfang.zhang@oss.qualcomm.com>,
	Abel Vesa <abelvesa@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, coresight@lists.linaro.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 3/5] arm64: dts: qcom: kaanapali: fix traceNoC probe issue
Date: Tue, 30 Jun 2026 21:44:05 +0800	[thread overview]
Message-ID: <865fcbae-10ad-4f6d-8b57-474626b71e36@oss.qualcomm.com> (raw)
In-Reply-To: <a88201a7-0a00-48d8-97cd-300d6aa5fc88@oss.qualcomm.com>



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



  reply	other threads:[~2026-06-30 13:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-30 10:36 [PATCH v3 0/5] Fix traceNoC probe issue on multiple QCOM platforms Jie Gan
2026-06-30 10:36 ` [PATCH v3 1/5] dt-bindings: arm: coresight-tnoc: Add standalone qcom,coresight-agtnoc compatible Jie Gan
2026-06-30 10:36 ` [PATCH v3 2/5] coresight: tnoc: Add AG tnoc standalone compatible to the platform driver Jie Gan
2026-06-30 10:36 ` [PATCH v3 3/5] arm64: dts: qcom: kaanapali: fix traceNoC probe issue Jie Gan
2026-06-30 12:53   ` Konrad Dybcio
2026-06-30 13:44     ` Jie Gan [this message]
2026-06-30 10:36 ` [PATCH v3 4/5] arm64: dts: qcom: sm8750: " Jie Gan
2026-06-30 10:36 ` [PATCH v3 5/5] arm64: dts: qcom: glymur: use Aggregator TNOC compatible Jie Gan

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