gpio: Add WM831X GPIO driver

Add support for the GPIO pins on the WM831x. No direct support is
currently supplied for configuring non-gpiolib functionality such
as pull configuration and alternate functions, soft configuration
of these will be provided in a future patch.

Currently use of these pins as interrupts is not supported due to
the ongoing issues with generic irq not support interrupt controllers
on interrupt driven buses. Users can directly request the interrupts
with the wm831x-specific APIs currently provided if required.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 96dda81c9228..6b4c484a699a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -155,6 +155,13 @@ config GPIO_TWL4030
           Say yes here to access the GPIO signals of various multi-function
           power management chips from Texas Instruments.
 
+config GPIO_WM831X
+        tristate "WM831x GPIOs"
+        depends on MFD_WM831X
+        help
+          Say yes here to access the GPIO signals of WM831x power management
+          chips from Wolfson Microelectronics.
+
 comment "PCI GPIO expanders:"
 
 config GPIO_BT8XX