+ * Used to enable core support for DMA handling, if can_dma()
+ * exists and returns true then the transfer will be mapped
+ * prior to transfer_one() being called. The driver should
+ * not modify or store xfer and dma_tx and dma_rx must be set
+ * while the device is prepared.
+ */
+ bool (*can_dma)(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer);
+
+ /*