[PATCH v6 0/2] perf: marvell: Add CN20K DDR PMU support

[Geetha sowjanya]

This series adds support for the DDR Performance Monitoring Unit (PMU)
present in Marvell CN20K SoCs.

The DDR PMU is part of the DRAM Subsystem (DSS) and provides hardware
counters to monitor DDR traffic and performance events. The block
implements eight programmable counters and two fixed-function counters
tracking DDR read and write activity, and is accessed via a dedicated
MMIO region.

CN20K is the successor to CN10K, and the DDR PMU hardware is functionally
equivalent to the CN10K implementation, with only minor differences in
register offsets and event mappings. To allow software to distinguish
between the two silicon variants, this series introduces a specific
"marvell,cn20k-ddr-pmu" compatible and extends the existing
marvell_cn10k_ddr_pmu driver to handle CN20K via variant-specific data.

Changes in v6:
- dt-bindings: Document CN20K in the existing marvell-cn10k-ddr.yaml;
  add maintainer, description, compatible enum entry, and a CN20K example
  with unit-address aligned to reg.
- perf: Route CN20K ZQ events via dedicated sysfs IDs (62/63) and CFG1
  programming; use (eventid - 42) for CFG1 bit positions and reject those IDs
  on non-CN20K silicon.
- perf: Disambiguate CN20K perf width events (58-61) from Odyssey DFI events
  at the same numeric IDs using an early CN20K branch and fallthrough into the
  existing DFI + programmable-event path on Odyssey.
- perf: Run CN20K programmable counters through the same manual-mode / start
  sequence as Odyssey.

Changes in v4:
- Fixed document file name.

Changes in v3:
- Expanded cover letter and commit message to better describe the DDR PMU
  hardware and its relationship to CN10K
- Fixed the file name.

Changes in v2:
- Fixed YAML syntax error triggered by a tab character in the examples
  section, which caused dt_binding_check to fail.

Changes in v1:
- Added a description field to the binding.
- Simplified the compatible property using 'const' instead of 'items/enum'.
- Updated the example node name to include a unit-address matching the reg base.

Signed-off-by: Geetha sowjanya <gakula@xxxxxxxxxxx>

Geetha sowjanya (2):
  dt-bindings: perf: marvell: Extend CN10K DDR PMU binding for CN20K
  perf: marvell: Add CN20K DDR PMU support

 .../bindings/perf/marvell-cn10k-ddr.yaml      |  18 +-
 drivers/perf/marvell_cn10k_ddr_pmu.c          | 197 ++++++++++++++++--
 2 files changed, 200 insertions(+), 15 deletions(-)

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2.25.1