mfd: Don't allow wm831x to be built as a module

The genirq infrastructure functions aren't currently exported,
preventing modular builds.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b46b11b2ad72..4502bcb91385 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -195,7 +195,7 @@ config MFD_WM8400
           the functionality of the device.
 
 config MFD_WM831X
-        tristate "Support Wolfson Microelectronics WM831x/2x PMICs"
+        bool "Support Wolfson Microelectronics WM831x/2x PMICs"
         select MFD_CORE
         depends on I2C
         help