If the performance of the SPI peripheral via the intel provided kernel code is any indication, it will likely be another year before we get that kernel update. It could be worse though, it could be I2C. I've been informed that any time a pin is toggled between input and output, as is needed for I2C, all of the GPIO pins get driven low during the transition. I have not tested that, but it is pretty lousy if that is the case.
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