gpiolib: Add WM8994 GPIO support

The WM8994 has 11 GPIO lines.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index acac9f6..f42cb31 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -192,6 +192,13 @@
 	  Say yes here to access the GPIO signals of WM8350 power management
 	  chips from Wolfson Microelectronics.
 
+config GPIO_WM8994
+	tristate "WM8994 GPIOs"
+	depends on MFD_WM8994
+	help
+	  Say yes here to access the GPIO signals of WM8994 audio hub
+	  CODECs from Wolfson Microelectronics.
+
 config GPIO_ADP5520
 	tristate "GPIO Support for ADP5520 PMIC"
 	depends on PMIC_ADP5520