ARM: psci: add support for PSCI invocations from the kernel

This patch adds support for the Power State Coordination Interface
defined by ARM, allowing Linux to request CPU-centric power-management
operations from firmware implementing the PSCI protocol.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 67874b82a4ed..96863b860641 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1620,6 +1620,16 @@ config HOTPLUG_CPU
           Say Y here to experiment with turning CPUs off and on.  CPUs
           can be controlled through /sys/devices/system/cpu.
 
+config ARM_PSCI
+        bool "Support for the ARM Power State Coordination Interface (PSCI)"
+        depends on CPU_V7
+        help
+          Say Y here if you want Linux to communicate with system firmware
+          implementing the PSCI specification for CPU-centric power
+          management operations described in ARM document number ARM DEN
+          0022A ("Power State Coordination Interface System Software on
+          ARM processors").
+
 config LOCAL_TIMERS
         bool "Use local timer interrupts"
         depends on SMP