mfd: AB3100 OTP readout

This adds the ability to read out OTP (One-Time Programmable)
registers in the AB3100 MFD ASIC. It's a simple sysfs file you
can cat to prompt. The OTP registers of the AB3100 are used to
store various device-unique information such as customer ID,
product flags and the 3GPP standard IMEI (International Mobile
Equipment Indentity) number.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index a4f3dff30ba5..4fd4f913c36b 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -276,6 +276,15 @@ config AB3100_CORE
           LEDs, vibrator, system power and temperature, power management
           and ALSA sound.
 
+config AB3100_OTP
+        tristate "ST-Ericsson AB3100 OTP functions"
+        depends on AB3100_CORE
+        default y if AB3100_CORE
+        help
+          Select this to enable the AB3100 Mixed Signal IC OTP (one-time
+          programmable memory) support. This exposes a sysfs file to read
+          out OTP values.
+
 config EZX_PCAP
         bool "PCAP Support"
         depends on GENERIC_HARDIRQS && SPI_MASTER