mfd: Add tps65910-irq devicetree init and irqdomain support

This change changes the tps65910-irq code to use irqdomain, and support
initialization from devicetree. This assumes that the irq_base in the
platform data is -1 if devicetree is used.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6da82de..b819eea 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -190,6 +190,7 @@
 	depends on I2C=y && GPIOLIB
 	select MFD_CORE
 	select REGMAP_I2C
+	select IRQ_DOMAIN
 	help
 	  if you say yes here you get support for the TPS65910 series of
 	  Power Management chips.