Some HW has static trace id which cannot be changed via software programming. For this case, configure the trace id in device tree with "trace-id = <xxx>", and call coresight_trace_id_get_system_id with the trace id value in device probe function. The id will be reserved for the HW all the time if the device is probed.
Changes since V1: 1. Add argument to coresight_trace_id_get_system_id for preferred id instead of adding new function coresight_trace_id_reserve_system_id. 2. Add constraint to trace-id in dt-binding file.
Mao Jinlong (3): dt-bindings: arm: Add trace-id for coresight dummy source coresight: Add support to get preferred id for system trace sources coresight: dummy: Add reserve atid support for dummy source
.../sysfs-bus-coresight-devices-dummy-source | 15 +++++ .../arm/arm,coresight-dummy-source.yaml | 6 ++ drivers/hwtracing/coresight/coresight-dummy.c | 58 +++++++++++++++++-- .../hwtracing/coresight/coresight-platform.c | 26 +++++++++ drivers/hwtracing/coresight/coresight-stm.c | 2 +- .../hwtracing/coresight/coresight-trace-id.c | 32 ++++++---- .../hwtracing/coresight/coresight-trace-id.h | 5 +- include/linux/coresight.h | 1 + 8 files changed, 128 insertions(+), 17 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source