mfd: Set da903x bits if new value is different from the old one
It does not make sense to write new value only when all the bit_mask bits are zero. We need to write new value if the bit mask fields of new value is not equal to old value. Signed-off-by: NAxel Lin <axel.lin@gmail.com> Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>
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