ARM: bL_switcher: add a simple /dev user interface for debugging purposes

Only the basic call to aid debugging.

*** NOT FOR PRODUCTION ***

Usage:

	echo <cpuid>,<clusterid> > /dev/b.L_switcher

where <cpuid> is the logical CPU number, and <clusterid> is 0 for the
first cluster and 1 for the second cluster.

Signed-off-by: nicolas Pitre <nico@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ade70017fd65..cfcb0d8d6f85 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1556,6 +1556,14 @@ config BL_SWITCHER
           transparently handle transition between a cluster of A15's
           and a cluster of A7's in a big.LITTLE system.
 
+config BL_SWITCHER_DUMMY_IF
+        tristate "Simple big.LITTLE switcher user interface"
+        depends on BL_SWITCHER && DEBUG_KERNEL
+        help
+          This is a simple and dummy char dev interface to control
+          the big.LITTLE switcher core code.  It is meant for
+          debugging purposes only.
+
 choice
         prompt "Memory split"
         default VMSPLIT_3G