linux-kernel - [PATCH v2 0/3] coresight: add static TPDM support

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Message-Id: <20250911-add_static_tpdm_support-v2-0-608559d36f74@oss.qualcomm.com>
Date: Thu, 11 Sep 2025 17:36:55 +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>,
        Jinlong Mao <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: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jie Gan <jie.gan@....qualcomm.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH v2 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 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       |   9 ++
 drivers/hwtracing/coresight/coresight-tpdm.c       | 148 ++++++++++++++++-----
 drivers/hwtracing/coresight/coresight-tpdm.h       |   8 ++
 5 files changed, 256 insertions(+), 37 deletions(-)
---
base-commit: 8f21d9da46702c4d6951ba60ca8a05f42870fe8f
change-id: 20250911-add_static_tpdm_support-b6eb2ecada26

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