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[v8,0/2] coresight: Add Coresight Trace Network On Chip driver

Message ID 20250606-trace-noc-v8-0-833f94712c57@quicinc.com
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Series coresight: Add Coresight Trace Network On Chip driver | expand

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Yuanfang Zhang June 6, 2025, 9:18 a.m. UTC 
The Trace Network On Chip (TNOC) is an integration hierarchy which is a
hardware component that integrates the functionalities of TPDA and
funnels. It collects trace from subsystems and transfers it to coresight
sink.

In addition to the generic TNOC mentioned above, there is also a special type
of TNOC called Interconnect TNOC. Unlike the generic TNOC, the Interconnect
TNOC doesn't need ATID. Its primary function is to connect the source of
subsystems to the Aggregator TNOC. Its driver is different from this patch and
will describe it and upstream its driver separately.

Signed-off-by: Yuanfang Zhang <quic_yuanfang@quicinc.com>
---
Changes in v8:
- Add sysfs node to expose atid.
- Link to v7: https://lore.kernel.org/r/20250523-trace-noc-v7-0-d65edbab2997@quicinc.com

Changes in v7:
- Move the content in header file into coresight-tnoc.c.
- Use scoped_guard() to replace spin_lock().
- Invoke coresight_trace_id_put_system_id() for registration failure.
- Link to v6: https://lore.kernel.org/r/20250522-trace-noc-v6-0-f5a9bcae90ee@quicinc.com

Changes in v6:
- Add a newline after return statements.
- Use 'x &= foo' to replace 'x = x & foo'.
- Use 'x |= foo' to replace 'x = x | foo'.
- Link to v5: https://lore.kernel.org/r/20250512-trace-noc-v5-0-f2ef070baee5@quicinc.com

Changes in v5:
- update cover-letter to describe the Interconnect TNOC.
- Link to v4: https://lore.kernel.org/r/20250415-trace-noc-v4-0-979938fedfd8@quicinc.com

Changes in v4:
- Fix dt_binding warning.
- update mask of trace_noc amba_id.
- Modify driver comments.
- rename TRACE_NOC_SYN_VAL to TRACE_NOC_SYNC_INTERVAL.
- Link to v3: https://lore.kernel.org/r/20250411-trace-noc-v3-0-1f19ddf7699b@quicinc.com

Changes in v3:
- Remove unnecessary sysfs nodes.
- update commit messages.
- Use 'writel' instead of 'write_relaxed' when writing to the register for the last time.
- Add trace_id ops.
- Link to v2: https://lore.kernel.org/r/20250226-trace-noc-driver-v2-0-8afc6584afc5@quicinc.com

Changes in v2:
- Modified the format of DT binging file.
- Fix compile warnings.
- Link to v1: https://lore.kernel.org/r/46643089-b88d-49dc-be05-7bf0bb21f847@quicinc.com

---
Yuanfang Zhang (2):
      dt-bindings: arm: Add device Trace Network On Chip definition
      coresight: add coresight Trace Network On Chip driver

 .../bindings/arm/qcom,coresight-tnoc.yaml          | 111 ++++++++++
 drivers/hwtracing/coresight/Kconfig                |  13 ++
 drivers/hwtracing/coresight/Makefile               |   1 +
 drivers/hwtracing/coresight/coresight-tnoc.c       | 242 +++++++++++++++++++++
 4 files changed, 367 insertions(+)
---
base-commit: a2cc6ff5ec8f91bc463fd3b0c26b61166a07eb11
change-id: 20250403-trace-noc-f8286b30408e

Best regards,