powerpc/cpuidle: cpuidle driver for pSeries

This patch implements a back-end cpuidle driver for pSeries
based on pseries_dedicated_idle_loop and pseries_shared_idle_loop
routines.  The driver is built only if CONFIG_CPU_IDLE is set. This
cpuidle driver uses global registration of idle states and
not per-cpu.

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Trinabh Gupta <g.trinabh@gmail.com>
Signed-off-by: Arun R Bharadwaj <arun.r.bharadwaj@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index c81f6bb9c10..ae7b6d41fed 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -120,3 +120,12 @@ config DTL
           which are accessible through a debugfs file.
 
           Say N if you are unsure.
+
+config PSERIES_IDLE
+        tristate "Cpuidle driver for pSeries platforms"
+        depends on CPU_IDLE
+        depends on PPC_PSERIES
+        default y
+        help
+          Select this option to enable processor idle state management
+          through cpuidle subsystem.