Hello, I would like to be able to setup my board's DMA engine at the time when dma_request_chan() is called by the driver using that specific channel. (Or some time later, but before an actual transfer is requested.) Does dma_request_chan() call back into the DMA driver at some point? If yes, through which function pointer? I see that of_dma_request_slave_channel() calls ofdma->of_dma_xlate() which is the function registered through of_dma_controller_register() in the DMA driver, right? Currently, the driver sets up the DMA engine at the time when the device_issue_pending() method is called, but this creates a catch-22 situation where A must be before B, and B must be before A. Looking at struct dma_device ... http://lxr.free-electrons.com/source/include/linux/dmaengine.h#L637 Could I use the device_config() call-back for this? https://www.kernel.org/doc/Documentation/dmaengine/client.txt Regards. -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
