mfd: Add TPS6586x driver

Add mfd core driver for TPS6586x PMICs family.
The driver provides I/O access for the sub-device drivers and performs
regstration of the sub-devices based on the platform requirements.
In addition it implements GPIOlib interface for the chip GPIOs.

TODO:
        - add interrupt support
        - add platform data for PWM, backlight leds and charger

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Kconfig

@@ -531,6 +531,20 @@ config MFD_JZ4740_ADC
 	  Say yes here if you want support for the ADC unit in the JZ4740 SoC.
 	  This driver is necessary for jz4740-battery and jz4740-hwmon driver.
 
+config MFD_TPS6586X
+	tristate "TPS6586x Power Management chips"
+	depends on I2C && GPIOLIB
+	select MFD_CORE
+	help
+	  If you say yes here you get support for the TPS6586X series of
+	  Power Management chips.
+	  This driver provides common support for accessing the device,
+	  additional drivers must be enabled in order to use the
+	  functionality of the device.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called tps6586x.
+
 endif # MFD_SUPPORT
 
 menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

@@ -74,3 +74,4 @@ obj-$(CONFIG_LPC_SCH)		+= lpc_sch.o
 obj-$(CONFIG_MFD_RDC321X)	+= rdc321x-southbridge.o
 obj-$(CONFIG_MFD_JANZ_CMODIO)	+= janz-cmodio.o
 obj-$(CONFIG_MFD_JZ4740_ADC)	+= jz4740-adc.o
+obj-$(CONFIG_MFD_TPS6586X)	+= tps6586x.o