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drivers: dma: sam0: Implement get_status API
Implement the get_status DMA API for the SAM0 DMA controller. The busy field is set only when the selected channel is actively transferring data (i.e. both enabled and selected by the arbiter). The direction field is left unset, since that information is not normally retained by the DMA controller. Signed-off-by: Derek Hageman <firstname.lastname@example.org>
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