Input: add PS/2 serio driver for AVR32 devices

Add support for the PSIF peripheral on AVR32 AP7 devices.  It is implemented
as a serio driver and will behave like a serio 8042 device.

The driver has been tested with a Dell keyboard capable of running on 3.3
volts and a Logitech mouse on the STK1000 + STK1002 starter kit.  The Logitech
mouse was hacked by cutting the cord and using a bi-directional voltage
converter to get the required 5 volt I/O level.

For more information about the PSIF module, see the datasheet for AT32AP700X at
http://www.atmel.com/dyn/products/datasheets.asp?family_id=682

Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index b88569e..ec4b661 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -88,6 +88,16 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called rpckbd.
 
+config SERIO_AT32PSIF
+	tristate "AVR32 PSIF PS/2 keyboard and mouse controller"
+	depends on AVR32
+	help
+	  Say Y here if you want to use the PSIF peripheral on AVR32 devices
+	  and connect a PS/2 keyboard and/or mouse to it.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called at32psif.
+
 config SERIO_AMBAKMI
 	tristate "AMBA KMI keyboard controller"
 	depends on ARM_AMBA