[PATCH v3 0/2] Enabling PSCI based idle on ARM 32-bit platforms

[Lorenzo Pieralisi]

This patch series is v3 of a previous posting:

http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/376418.html

v2->v3:

- Patch 1 merged
- Added ARM ARM_CPU_SUSPEND config option rework patch
- Added CPU_IDLE guard to prevent compiling code if not needed
- Added ARM_CPU_SUSPEND ARM_PSCI_FW dependency

v1->v2:

- Refactored patch 1 to remove cpu parameter from cpuidle_ops
  suspend hook
- Refactored psci_cpu_init_idle to stub out dt parsing function and
  make it usable on both ARM/ARM64 with no additional changes
- Updated ARM cpuidle_ops to new interfaces
- Fixed PSCI enable method string in ARM cpuidle_ops struct

PSCI firmware provides a kernel API that, through a standard interface,
allows to manage power states transitions in a seamless manner for
ARM and ARM64 systems.

Current PSCI code that initializes CPUidle states on PSCI based
systems lives in arch/arm64 directory but it is not ARM64 specific
and can be shared with ARM 32-bit systems so that the generic
ARM CPUidle driver can leverage the common PSCI interface.

This patch series moves PSCI CPUidle management code to
drivers/firmware directory so that ARM and ARM64 architecture
can actually share the code.

It is made up of two patches:

Patch 1 refactors ARM ARM_CPU_SUSPEND config dependencies

Patch 2 moves ARM64 PSCI CPUidle functions implementation to
drivers/firmware so that it can be shared with ARM 32-bit platforms
code. This patch also adds a PSCI entry section on ARM 32-bit systems
so that the PSCI CPUidle back-end can be enabled when the enable-method
corresponds to PSCI.

Tested on Juno board (ARM64), compile tested only on ARM 32-bit systems.

Lorenzo Pieralisi (2):
  ARM: rework ARM_CPU_SUSPEND dependencies
  ARM64: kernel: PSCI: move PSCI idle management code to
    drivers/firmware

 arch/arm/Kconfig         |   4 +-
 arch/arm64/kernel/psci.c |  99 +-------------------------------------
 drivers/firmware/psci.c  | 120 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/psci.h     |   3 ++
 4 files changed, 127 insertions(+), 99 deletions(-)

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2.5.1