mc13xxx: add I2C support, V5

[Marc Reilly]

Hi,

This series (against mfd-2.6/for-next) changes the mc13xxx driver to use 
regmap and adds I2C support.
It has a compile dependency on regmap/for-next, as the spi driver uses the
recently added pad_bits config field.

Patch 2/4 has:
Reviewed-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Patch 4/4 has:
Signed-off-by: Oskar Schirmer <oskar@xxxxxxxxx>

Changes since:
V4:
- Fix compile error when CONFIG_OF enabled
- Select REGMAP_I2C and REGMAP_SPI for appropriate drivers.

V3:
- spi driver uses padded register format (reads should actually work now!)
- mc13873 removed from I2C driver
- fix memory leak on probe error

Cheers,
Marc


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