[PATCH v1 -next 0/3] RISC-V: ACPI: Enable CPPC based cpufreq support

[Sunil V L <sunilvl@ventanamicro.com>]

This series enables the support for "Collaborative Processor Performance
Control (CPPC) on ACPI based RISC-V platforms. It depends on the
encoding of CPPC registers as defined in RISC-V FFH spec [2].

CPPC is described in the ACPI spec [1]. RISC-V FFH spec required to
enable this, is available at [2].

[1] - https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html#collaborative-processor-performance-control
[2] - https://github.com/riscv-non-isa/riscv-acpi-ffh/releases/download/v1.0.0/riscv-ffh.pdf

The series is based on the LPI support series.
Based-on: 20240118062930.245937-1-sunilvl@ventanamicro.com
(https://lore.kernel.org/lkml/20240118062930.245937-1-sunilvl@ventanamicro.com/)

Sunil V L (3):
  ACPI: RISC-V: Add CPPC driver
  cpufreq: Move CPPC configs to common Kconfig and add RISC-V
  RISC-V: defconfig: Enable CONFIG_ACPI_CPPC_CPUFREQ

 arch/riscv/configs/defconfig |   1 +
 drivers/acpi/riscv/Makefile  |   1 +
 drivers/acpi/riscv/cppc.c    | 157 +++++++++++++++++++++++++++++++++++
 drivers/cpufreq/Kconfig      |  29 +++++++
 drivers/cpufreq/Kconfig.arm  |  26 ------
 5 files changed, 188 insertions(+), 26 deletions(-)
 create mode 100644 drivers/acpi/riscv/cppc.c

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2.34.1