From: Rob Herring <robh@kernel.org>
To: Jie Gan <jie.gan@oss.qualcomm.com>
Cc: 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>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Tingwei Zhang <tingwei.zhang@oss.qualcomm.com>,
Yuanfang Zhang <yuanfang.zhang@oss.qualcomm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Abel Vesa <abelvesa@kernel.org>,
Jingyi Wang <jingyi.wang@oss.qualcomm.com>,
linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Subject: Re: [PATCH v7 0/5] Fix traceNoC probe issue on multiple QCOM platforms
Date: Tue, 10 Nov 2026 09:46:43 -0600 [thread overview]
Message-ID: <20261110154643.GA4159803-robh@kernel.org> (raw)
In-Reply-To: <20261110-fix-trace-noc-probe-issue-v7-0-2f06905c77fe@oss.qualcomm.com>
On Tue, Nov 10, 2026 at 09:21:13AM +0800, Jie Gan wrote:
> The CoreSight TNOC (Trace Network-On-Chip) binding so far only allowed the
> two-string AMBA form "qcom,coresight-tnoc", "arm,primecell". That form
> forces the device onto the AMBA bus, where the driver must read the
> peripheral ID from the device registers during probe. On several QCOM
> platforms this AMBA peripheral-ID probing fails, so the traceNoC device
> never probes and its trace path is unavailable.
But it works fine on some platforms? We have a property to override the
peripheral-ID which would solve your issue. That would be much simpler
and avoid the ABI break on any of the working platforms.
But this is already applied and it's not any platform I use, so I don't
really care.
Rob
prev parent reply other threads:[~2026-11-10 15:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-10 1:21 Jie Gan
2026-11-10 1:21 ` [PATCH v7 1/5] dt-bindings: arm: coresight-tnoc: Bind on platform bus instead of AMBA Jie Gan
2026-11-10 1:21 ` [PATCH v7 2/5] coresight: tnoc: Bind Aggregator TNOC on the platform bus Jie Gan
2026-11-10 1:21 ` [PATCH v7 3/5] arm64: dts: qcom: kaanapali: bind traceNoC " Jie Gan
2026-11-10 1:21 ` [PATCH v7 4/5] arm64: dts: qcom: sm8750: " Jie Gan
2026-11-10 1:21 ` [PATCH v7 5/5] arm64: dts: qcom: glymur: use Aggregator TNOC compatible Jie Gan
2026-11-10 9:44 ` Abel Vesa
2026-11-10 11:46 ` [PATCH v7 0/5] Fix traceNoC probe issue on multiple QCOM platforms Suzuki K Poulose
2026-11-10 15:46 ` Rob Herring [this message]
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