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- May 17 2017, 9:27 AM (212 w, 6 d)
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You are right, I will change first comment.
I decided to create dma tag in ofwbus and moved 'dma-coherent' property to '/' node in DTS.
All changes related to dma tag creation are now done only if FDT is defined.
Yes, coherent IO is a platform-wide feature.
I added two comments to the code as you suggested. First one is different because DMAMAP_COHERENT flag does not disable sync ops. It only show that the buffer must be coherent.