SPI: add dma_alignment field to spi_master

[linux-2.6-omap-h63xx.git] / include / linux / spi / spi.h

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 68bb1c501d0deee6ebe3d963222e48f34c212ef8..2cc43fa380cb805ff921b878fd3f3791ff84d9b2 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -204,6 +204,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
  *     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.
@@ -239,6 +240,11 @@ struct spi_master {
         */
        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);