mfd: AB3550 core driver

This adds a core driver for the AB3550 mixed-signal circuit
found in the ST-Ericsson U300 platforms. This driver
is a singleton proxy for all access to the AB3550 sub
functionality drivers which can be added on top of this one:
RTC, regulators, battery and system power control, vibrator,
LEDs and an ALSA codec.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1c3d737ec406..a20fa230d354 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -423,6 +423,20 @@ config AB4500_CORE
           read/write functions for the devices to get access to this chip.
           This chip embeds various other multimedia funtionalities as well.
 
+config AB3550_CORE
+        bool "ST-Ericsson AB3550 Mixed Signal Circuit core functions"
+        select MFD_CORE
+        depends on I2C=y && GENERIC_HARDIRQS && ABX500_CORE
+        help
+          Select this to enable the AB3550 Mixed Signal IC core
+          functionality. This connects to a AB3550 on the I2C bus
+          and expose a number of symbols needed for dependent devices
+          to read and write registers and subscribe to events from
+          this multi-functional IC. This is needed to use other features
+          of the AB3550 such as battery-backed RTC, charging control,
+          LEDs, vibrator, system power and temperature, power management
+          and ALSA sound.
+
 config MFD_TIMBERDALE
         tristate "Support for the Timberdale FPGA"
         select MFD_CORE