[PATCH V2 5/5] i2c: riic: add driver

[Wolfram Sang]

> disable interrupts at runtime and use that as a state machine, while I was 
> wondering whether it wouldn't be simpler to keep all interrupts enabled at all 
> time and handle the synchronization explicitly.

If I do this, I'll get another "spurious" interrupt telling me the transmit
register is empty again, even after I wrote the last byte. I don't like
this.

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