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 some TPDMs, they would be configured in NON-HLOS side, but it's necessary to build Coresight path for it to debug. So there need driver to register dummy devices as Coresight devices. Commit link: https://git.codelinaro.org/clo/linux-kernel/coresight/-/tree/coresight-dummy-v6 Changes in V6: 1. Add the missing information and update the patch version. Changes in V5: 1. Follow the alphabetical order for the header files in coresight-dummy.c. -- Suzuki K Poulose 2. Update the maintainers. 3. Split the Coresight Dummy YAML to 2 schema files. -- Rob Herring & Krzysztof Kozlowski 4. Update the coresight-dummy.rst file. -- Bagas Sanjaya Changes in V4: 1. Remove traceid allocation in dummy_probe function since it is currently not in use, will upstream it as the part of ATID filtering in the further. -- Suzuki K Poulose 2. Remove 'oneOf' as there is only one entry. -- Rob Herring Changes in V3: 1. Use API "dev_dbg" to replace "dev_info". -- Suzuki K Poulose 2. Drop "qcom" property and take it as a dummy framework. -- Suzuki K Poulose 3. Add new sub-type "CORESIGHT_DEV_SUBTYPE_SINK_DUMMY" to support coresight dummy module -- Mike Leach 4. Use compatibles "arm,coresight-dummy-source" and "arm,coresight-dummy-sink" to replace property "qcom,dummy-source" and "qcom,dummy-sink". -- Mike Leach 5. Define source_devs and sink_devs DEVLIST to replace dummy_devs, make it clear at the first level. -- Mike Leach 6. Modify subject of YAML patch, drop "YAML schema". -- Krzysztof Kozlowski 7. Drop some redundant items and correct syntax errors in yaml file. -- Krzysztof Kozlowski & Rob Herring 8. Correct required property of yaml file, constrain out ports to dummy-source and in ports to dummy-sink. -- Mike Leach 9. Drop "Sysfs files and directories" contents of coresight-dummy.rst. -- Suzuki K Poulose/Greg Kroah-Hartman 10.Correct syntax errors of coresight-dummy.rst. -- Bagas Sanjaya Changes in V2: 1. Declare dummy_init and dummy_exit as static to fix missing-prototypes warnings. -- kernel test robot 2. Fix the errors of coresight-dummy yaml file. -- Rob Herring Hao Zhang (3): Coresight: Add coresight dummy driver dt-bindings: arm: Add support for Coresight dummy trace Documentation: trace: Add documentation for Coresight Dummy Trace .../arm/arm,coresight-dummy-sink.yaml | 73 ++++++++ .../arm/arm,coresight-dummy-source.yaml | 71 ++++++++ .../trace/coresight/coresight-dummy.rst | 32 ++++ drivers/hwtracing/coresight/Kconfig | 11 ++ drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-dummy.c | 163 ++++++++++++++++++ include/linux/coresight.h | 1 + 7 files changed, 352 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-dummy-sink.yaml create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-dummy-source.yaml create mode 100644 Documentation/trace/coresight/coresight-dummy.rst create mode 100644 drivers/hwtracing/coresight/coresight-dummy.c -- 2.17.1
