linux-kernel - [PATCH v4 0/3] coresight: add static TPDM support

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Message-Id: <20251028-add_static_tpdm_support-v4-0-84e21b98e727@oss.qualcomm.com>
Date: Tue, 28 Oct 2025 18:11:39 +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>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>,
        Mao Jinlong <jinlong.mao@....qualcomm.com>,
        Tao Zhang <tao.zhang@....qualcomm.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
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, Jie Gan <jie.gan@....qualcomm.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH v4 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.

Changes in V4:
1. decouple from tpda driver code.
2. Introduce a new solution to identify static TPDM.
Link to V3 - https://lore.kernel.org/all/20251013-add-static-tpdm-support-v3-0-a720b73e83db@oss.qualcomm.com/

Changes in V3:
1. rebased on next-20251010
Link to V2 - https://lore.kernel.org/all/20250911-add_static_tpdm_support-v2-0-608559d36f74@oss.qualcomm.com/

Changes in V2:
1. Remove the dependency.
2. Collect tags from Rob and Konard for patchset 1 and patchset 3.
Link to V1 - https://lore.kernel.org/all/20250822103008.1029-1-jie.gan@oss.qualcomm.com/

Signed-off-by: Jie Gan <jie.gan@....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       |   7 -
 drivers/hwtracing/coresight/coresight-tpdm.c       | 174 +++++++++++++++++----
 drivers/hwtracing/coresight/coresight-tpdm.h       |  12 ++
 5 files changed, 279 insertions(+), 42 deletions(-)
---
base-commit: f7d2388eeec24966fc4d5cf32d706f0514f29ac5
change-id: 20251028-add_static_tpdm_support-1f62477857e2

Best regards,
-- 
Jie Gan <jie.gan@....qualcomm.com>