From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: Rob Herring <robh@kernel.org>, Jie Gan <jie.gan@oss.qualcomm.com>
Cc: 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: Wed, 11 Nov 2026 12:58:59 +0000 [thread overview]
Message-ID: <14c0956c-904e-4a6a-98a0-882514d77b08@arm.com> (raw)
In-Reply-To: <20261110154643.GA4159803-robh@kernel.org>
On 10/11/2026 15:46, Rob Herring wrote:
> 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.
That is true ! Sorry, I didn't think of the quirk.
>
> But this is already applied and it's not any platform I use, so I don't
> really care.
I am happy to revert these changes and let the DTS be fixed.
Cheers
Suzuki
>
> Rob
prev parent reply other threads:[~2026-11-11 12:59 UTC|newest]
Thread overview: 10+ 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
2026-11-11 12:58 ` Suzuki K Poulose [this message]
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