> So the question is - does the user of i2c_transfer have to provide a dma-able > buffer, or is the bus driver (like the robotfuzz one) expected to convert > incoming buffer into a dma-able buffer?
As of now, this is an open question, sadly. I have a tendency to leave it to the drivers (maybe with helper functions from the core), because I2C and DMA is so uncommon. I need to work on I2C & DMA next month anyhow, so I hope to dive into that topic, too. No promises, though. If you want to look into it already, please go ahead. The issue was raised here, too: http://patchwork.ozlabs.org/patch/220137/
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