mfd: New AB8500 driver

Add a new driver to support the AB8500 Power Management chip, replacing
the current AB4500.  The new driver replaces the old one, instead of an
incremental modification, because this is a substantial overhaul
including:

 - Split of the driver into -core and -spi portions, to allow another
   interface layer to be added

 - Addition of interrupt support

 - Switch to MFD core API for handling subdevices

 - Simplification of the APIs to remove a redundant block parameter

 - Rename of the APIs and macros from ab4500_* to ab8500_*

 - Rename of the files from ab4500* to ab8500*

 - Change of the driver name from ab4500 to ab8500

Acked-by: Linus Walleij <[email protected]>
Acked-by: Srinidhi Kasagar <[email protected]>
Signed-off-by: Rabin Vincent <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>

arch/arm/mach-ux500/board-mop500.c

@@ -50,7 +50,7 @@ struct pl022_config_chip ab4500_chip_info = {
 
 static struct spi_board_info u8500_spi_devices[] = {
 	{
-		.modalias = "ab4500",
+		.modalias = "ab8500",
 		.controller_data = &ab4500_chip_info,
 		.max_speed_hz = 12000000,
 		.bus_num = 0,

drivers/mfd/Kconfig

@@ -420,11 +420,12 @@ config EZX_PCAP
 	  This enables the PCAP ASIC present on EZX Phones. This is
 	  needed for MMC, TouchScreen, Sound, USB, etc..
 
-config AB4500_CORE
-	tristate "ST-Ericsson's AB4500 Mixed Signal Power management chip"
-	depends on SPI
+config AB8500_CORE
+	bool "ST-Ericsson AB8500 Mixed Signal Power Management chip"
+	depends on SPI=y && GENERIC_HARDIRQS
+	select MFD_CORE
 	help
-	  Select this option to enable access to AB4500 power management
+	  Select this option to enable access to AB8500 power management
 	  chip. This connects to U8500 on the SSP/SPI bus and exports
 	  read/write functions for the devices to get access to this chip.
 	  This chip embeds various other multimedia funtionalities as well.

drivers/mfd/Makefile

@@ -64,8 +64,8 @@ obj-$(CONFIG_PCF50633_GPIO)	+= pcf50633-gpio.o
 obj-$(CONFIG_ABX500_CORE)	+= abx500-core.o
 obj-$(CONFIG_AB3100_CORE)	+= ab3100-core.o
 obj-$(CONFIG_AB3100_OTP)	+= ab3100-otp.o
-obj-$(CONFIG_AB4500_CORE)	+= ab4500-core.o
 obj-$(CONFIG_AB3550_CORE)	+= ab3550-core.o
+obj-$(CONFIG_AB8500_CORE)	+= ab8500-core.o ab8500-spi.o
 obj-$(CONFIG_MFD_TIMBERDALE)    += timberdale.o
 obj-$(CONFIG_PMIC_ADP5520)	+= adp5520.o
 obj-$(CONFIG_LPC_SCH)		+= lpc_sch.o