Hi Samuel,

After merging the mfd tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

drivers/built-in.o: In function `rc5t583_i2c_init':
rc5t583.c:(.init.text+0xb3db): undefined reference to `i2c_register_driver'
drivers/built-in.o: In function `rc5t583_i2c_probe':
rc5t583.c:(.devinit.text+0x8fa0): undefined reference to `regmap_init_i2c'
drivers/built-in.o: In function `rc5t583_i2c_exit':
rc5t583.c:(.exit.text+0x708): undefined reference to `i2c_del_driver'

Caused by commit 1b1247dd75aa ("mfd: Add support for RICOH PMIC
RC5T583"). Presumably some missing Kconfig dependency.

I have ued the version of the mfd tree from next-20120316 for today.
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au