On 16/03/2023 03:20, Hao Zhang wrote:

Introduction of Coresight Dummy subunit The Coresight Dummy subunit is for Coresight Dummy component, there are some specific Coresight devices that HLOS don't have permission to access. Such as

What is HLOS ?

some TPDMs, they would be configured in NON-HLOS side, but it's necessary to

What is NON-HLOS ?

build Coresight path for it to debug. So there need driver to register dummy devices as Coresight devices.

Build a path for who to debug ? If this is used by some privileged software, shouldn't that do all of the work ?

Suzuki

Commit link: https://git.codelinaro.org/clo/linux-kernel/coresight/-/tree/coresight-dummy

Hao Zhang (3): Coresight: Add coresight dummy driver dt-bindings: arm: Add Coresight Dummy Trace YAML schema Documentation: trace: Add documentation for Coresight Dummy Trace

.../bindings/arm/qcom,coresight-dummy.yaml | 129 +++++++++++++ .../trace/coresight/coresight-dummy.rst | 58 ++++++ drivers/hwtracing/coresight/Kconfig | 11 ++ drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-dummy.c | 176 ++++++++++++++++++ 5 files changed, 375 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml create mode 100644 Documentation/trace/coresight/coresight-dummy.rst create mode 100644 drivers/hwtracing/coresight/coresight-dummy.c