Input: add support for PowerOn button on the AB8500 MFD

Add the PowerOn (PonKey) button support to detect power on/off events.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Sundar R Iyer <sundar.iyer@stericsson.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index b49e233..b99b8cb 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -22,6 +22,16 @@
 	  To compile this driver as a module, choose M here: the module
 	  will be called 88pm860x_onkey.
 
+config INPUT_AB8500_PONKEY
+	tristate "AB8500 Pon (PowerOn) Key"
+	depends on AB8500_CORE
+	help
+	  Say Y here to use the PowerOn Key for ST-Ericsson's AB8500
+	  Mix-Sig PMIC.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called ab8500-ponkey.
+
 config INPUT_AD714X
 	tristate "Analog Devices AD714x Capacitance Touch Sensor"
 	help