The I2C controller on the Allwinner hardware is actually a modified

Marvell controller.  The difference is essentially register offsets
and a clock divider calculation based on a power of two.  Also this
particular hardware needs a delay after sending a stop and before
reading the status register since apparently the data doesn't
propagate fast enough.  This makes sxitwi(4) work on the Marvell
Armada 38x.

ok kettenis@

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