Input: add keypad driver for w90p910

Add keypad driver for the 4x4 keypad on an evaluation board based
on w90p910.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Reviewed-by: Trilok Soni <soni.trilok@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 5239e25..50e407d 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -362,4 +362,14 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called xtkbd.
 
+config KEYBOARD_W90P910
+	tristate "W90P910 Matrix Keypad support"
+	depends on ARCH_W90X900
+	help
+	  Say Y here to enable the matrix keypad on evaluation board
+	  based on W90P910.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called w90p910_keypad.
+
 endif