mfd: AB8500 register access via PRCMU I2C

This patch adds the choice of accessing the AB8500 registers
via prcmu I2C. Access either via SPI or I2C is supported.

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

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index e310cb26f520..01c928bca099 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -475,14 +475,25 @@ config EZX_PCAP
 
 config AB8500_CORE
         bool "ST-Ericsson AB8500 Mixed Signal Power Management chip"
-        depends on SPI=y && GENERIC_HARDIRQS && ABX500_CORE
+        depends on GENERIC_HARDIRQS && ABX500_CORE && SPI_MASTER
         select MFD_CORE
         help
           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.
+          chip. This connects to U8500 either on the SSP/SPI bus
+          or the I2C bus via PRCMU. It also adds the irq_chip
+          parts for handling the Mixed Signal chip events.
           This chip embeds various other multimedia funtionalities as well.
 
+config AB8500_I2C_CORE
+        bool "AB8500 register access via PRCMU I2C"
+        depends on AB8500_CORE && UX500_SOC_DB8500
+        default y
+        help
+          This enables register access to the AB8500 chip via PRCMU I2C.
+          The AB8500 chip can be accessed via SPI or I2C. On DB8500 hardware
+          the I2C bus is connected to the Power Reset
+          and Mangagement Unit, PRCMU.
+
 config AB8500_DEBUG
        bool "Enable debug info via debugfs"
        depends on AB8500_CORE && DEBUG_FS