[PATCH v6 0/3] coresight: Add static trace id support

From: Mao Jinlong
Date: Mon Nov 04 2024 - 06:57:52 EST


Some HW has static trace id which cannot be changed via
software programming. For this case, configure the trace id
in device tree with "arm,static-trace-id = <xxx>", and
call coresight_trace_id_get_static_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 V5:
1. Remove the warn for staic id not available.
2. Drop the system_id if registering the coresight device fails.
3. Return busy when static id is not available in dummy driver.

Changes since V4:
1. Use fwnode_property_read_u32 in fwnode_property_read_u32.
2. Update date and version in sysfs-bus-coresight-devices-dummy-source

Changes since V3:
1. Adda new API function
int coresight_trace_id_get_system_static_id(int trace_id).
2. Use the term "static trace id" for these devices where
the hardware sets a non-programmable trace ID.

Changes since V2:
1. Change "trace-id" to "arm,trace-id".
2. Add trace id flag for getting preferred id or ODD id.

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 arm,static-trace-id for coresight dummy source
coresight: Add support to get static id for system trace sources
coresight: dummy: Add static trace id support for dummy source

.../sysfs-bus-coresight-devices-dummy-source | 15 ++++
.../arm/arm,coresight-dummy-source.yaml | 6 ++
drivers/hwtracing/coresight/coresight-dummy.c | 81 ++++++++++++++++---
.../hwtracing/coresight/coresight-platform.c | 6 ++
.../hwtracing/coresight/coresight-trace-id.c | 39 ++++++---
.../hwtracing/coresight/coresight-trace-id.h | 9 +++
include/linux/coresight.h | 1 +
7 files changed, 137 insertions(+), 20 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source

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2.17.1