linux-imx

This API returns the mask that the platform requires to

operate efficiently.  Usually this means the returned mask

is the minimum required to cover all of memory.  Examining the

required mask gives drivers with variable descriptor sizes the

opportunity to use smaller descriptors as necessary.

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Requesting the required mask does not alter the current mask.  If you

wish to take advantage of it, you should issue a dma_set_mask()

call to set the mask to the value returned.

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Part Id - Streaming DMA mappings

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    dma_addr_t

    dma_map_single(struct device *dev, void *cpu_addr, size_t size,

               enum dma_data_direction direction)

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