* SPI slaves, and are numbered from zero to num_chipselects.
* each slave has a chipselect signal, but it's common that not
* every chipselect is connected to a slave.
+ * @dma_alignment: SPI controller constraint on DMA buffers alignment.
* @setup: updates the device mode and clocking records used by a
* device's SPI controller; protocol code may call this. This
* must fail if an unrecognized or unsupported mode is requested.
*/
u16 num_chipselect;
+ /* some SPI controllers pose alignment requirements on DMAable
+ * buffers; let protocol drivers know about these requirements.
+ */
+ u16 dma_alignment;
+
/* setup mode and clock, etc (spi driver may call many times) */
int (*setup)(struct spi_device *spi);
* @tx_dma: DMA address of tx_buf, if @spi_message.is_dma_mapped
* @rx_dma: DMA address of rx_buf, if @spi_message.is_dma_mapped
* @len: size of rx and tx buffers (in bytes)
- * @speed_hz: Select a speed other then the device default for this
+ * @speed_hz: Select a speed other than the device default for this
* transfer. If 0 the default (from @spi_device) is used.
- * @bits_per_word: select a bits_per_word other then the device default
+ * @bits_per_word: select a bits_per_word other than the device default
* for this transfer. If 0 the default (from @spi_device) is used.
* @cs_change: affects chipselect after this transfer completes
* @delay_usecs: microseconds to delay after this transfer before