[PATCH 0/9] cpufreq: tegra194: add Tegra264 support

[Sumit Gupta]

This series adds cpufreq support for Tegra264, which joins the SoCs
already supported by the tegra194-cpufreq driver.

Tegra264 keeps the existing model, where BPMP provides the NDIV limits.
The driver derives the current frequency from the core clock and
reference counters.

The main differences are:
 - Frequency read: through system registers, as on Tegra194, but from
   the 64-bit architected AMU counters. The reference counter ticks at
   the system counter rate (CNTFRQ).

 - Frequency request: through MMIO, as on Tegra234. The driver writes
   NDIV to a core_freq_req register in the CCPLEX register space. Each
   register controls a cluster-clock unit shared by two single-CPU
   clusters, so both CPUs form one cpufreq policy.

The patches fall into four groups:
 - Fix (patch 1): read each CPU's MPIDR from a CPU-hotplug callback
   instead of at probe. A CPU that is offline at probe then also gets
   valid cluster and core IDs.

 - Preparation (patches 2 to 5): cleanups, mostly of the counter code,
   to make room for a 64-bit counter and for an MMIO mapping without
   ACTMON counters.

 - Improvement (patches 6 and 7): group CPUs by the generic
   "performance-domains" property, which cluster-based grouping cannot
   express on Tegra264. Device trees without it keep the existing
   grouping.

 - Tegra264 support (patches 8 and 9): the driver support, followed by
   the device tree changes it relies on.

Patch 9 depends on "arm64: tegra: Fix address translation on Tegra264"
from Thierry's series [1]. Without it, the ccplex@30000000 node does not
translate to the CCPLEX registers.


Sumit Gupta (9):
  cpufreq: tegra194: move MPIDR read to CPU hotplug callback
  cpufreq: tegra194: remove duplicate counter sampling loops
  cpufreq: tegra194: add tegra_counter_delta helper
  cpufreq: tegra194: add per-SoC counter mask
  cpufreq: tegra194: split MMIO mapping from ACTMON offset
  dt-bindings: arm: nvidia: Document the Tegra264 CCPLEX cluster
  cpufreq: tegra194: derive frequency domain from device tree
  cpufreq: tegra194: Add support for Tegra264
  arm64: tegra: Add CCPLEX cluster node for Tegra264

 .../tegra/nvidia,tegra-ccplex-cluster.yaml    |  27 +-
 arch/arm64/boot/dts/nvidia/tegra264.dtsi      |  21 +
 drivers/cpufreq/Kconfig.arm                   |   4 +-
 drivers/cpufreq/tegra194-cpufreq.c            | 422 +++++++++++++-----
 4 files changed, 357 insertions(+), 117 deletions(-)

[1] https://lore.kernel.org/linux-tegra/20261030141101.845044-1-thierry.reding@xxxxxxxxxx/

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