mfd: Use bulk read to fill WM8350 register cache
Some I2C controllers have high overheads for setting up I2C operations which makes the register cache setup on startup excessively slow since it does a lot of small transactions. Reduce this overhead by doing a bulk read of the entire register bank and filtering out what we don't need later. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: NSamuel Ortiz <sameo@openedhand.com>
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