[PATCH v4 0/2] perf: marvell: Add CN20K DDR PMU support

[Geetha sowjanya <gakula@marvell.com>]

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.

Signed-off-by: Geetha sowjanya <gakula@marvell.com>

Chnages 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.

Geetha sowjanya (2):
  dt-bindings: perf: marvell: Document CN20K DDR PMU
  perf: marvell: Add CN20K DDR PMU support

 .../bindings/perf/marvell-cn20k-ddr-pmu.yaml  |  39 ++++
 drivers/perf/marvell_cn10k_ddr_pmu.c          | 187 ++++++++++++++++--
 2 files changed, 210 insertions(+), 16 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/perf/marvell-cn20k-ddr-pmu.yaml

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2.25.1