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Now that both eDMA and iATU are prepared to support async transfer, let's enable MHI async read/write by supplying the relevant callbacks. In the absence of eDMA, iATU will be used for both sync and async operations. Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Krzysztof Wilczyński <kw@linux.com> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>