linux-kernel - [PATCH v1 0/3] coresight: add static TPDM support

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Message-Id: <20250822103008.1029-1-jie.gan@oss.qualcomm.com>
Date: Fri, 22 Aug 2025 18:30:05 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>,
        Mao Jinlong <jinlmao.mao@....qualcomm.com>,
        Tao Zhang <quic_taozha@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/3] coresight: add static TPDM support

The static TPDM function as a dummy source, however, it is essential
to enable the port connected to the TPDA and configure the element size.
Without this, the TPDA cannot correctly receive trace data from the
static TPDM. Since the static TPDM does not require MMIO mapping to
access its registers, a clock controller is not mandatory for its
operation.

Meanwhile, a function has been introduced to determine whether the
current csdev is a static TPDM. This check enables the TPDA device
to correctly read the element size and activate its port accordingly.
Otherwise the TPDA cannot receive the trace data from the TPDM device.

Dependency:
https://lore.kernel.org/all/20250806080931.14322-1-jie.gan@oss.qualcomm.com/

Jie Gan (3):
  dt-bindings: arm: document the static TPDM compatible
  coresight: tpdm: add static tpdm support
  arm64: dts: qcom: lemans: enable static TPDM

 .../bindings/arm/qcom,coresight-tpdm.yaml     |  23 ++-
 arch/arm64/boot/dts/qcom/lemans.dtsi          | 105 +++++++++++++
 drivers/hwtracing/coresight/coresight-tpda.c  |   9 ++
 drivers/hwtracing/coresight/coresight-tpdm.c  | 148 ++++++++++++++----
 drivers/hwtracing/coresight/coresight-tpdm.h  |   8 +
 5 files changed, 256 insertions(+), 37 deletions(-)

-- 
2.34.1