mfd: More verbose MFD Kconfig entry

For people to be able to intellingibly decide if they want to enable MFD
drivers or not, we have to give them a much better description of what they
are.

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9da0e50..29781ca 100644 (file)
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -7,7 +7,16 @@ menuconfig MFD_SUPPORT
        depends on HAS_IOMEM
        default y
        help
-         Configure MFD device drivers.
+         Multifunction devices embed several functions (e.g. GPIOs,
+         touchscreens, keyboards, current regulators, power management chips,
+         etc...) in one single integrated circuit. They usually talk to the
+         main CPU through one or more IRQ lines and low speed data busses (SPI,
+         I2C, etc..). They appear as one single device to the main system
+         through the data bus and the MFD framework allows for sub devices
+         (a.k.a. functions) to appear as discrete platform devices.
+         MFDs are typically found on embedded platforms.
+
+         This option alone does not add any kernel code.
 
 if MFD_SUPPORT