[PATCH] SPI: per-transfer overrides for wordsize and clocking

[karo-tx-linux.git] / include / linux / spi / spi.h

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index b05f1463a2676de35237dda137772ad70dc1c93d..caa4665e3fa22f6f92e05d521af87306a4ab2ff6 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -31,6 +31,7 @@ extern struct bus_type spi_bus_type;
  * @master: SPI controller used with the device.
  * @max_speed_hz: Maximum clock rate to be used with this chip
  *     (on this board); may be changed by the device's driver.
+ *     The spi_transfer.speed_hz can override this for each transfer.
  * @chip-select: Chipselect, distinguishing chips handled by "master".
  * @mode: The spi mode defines how data is clocked out and in.
  *     This may be changed by the device's driver.
@@ -38,6 +39,7 @@ extern struct bus_type spi_bus_type;
  *     like eight or 12 bits are common.  In-memory wordsizes are
  *     powers of two bytes (e.g. 20 bit samples use 32 bits).
  *     This may be changed by the device's driver.
+ *     The spi_transfer.bits_per_word can override this for each transfer.
  * @irq: Negative, or the number passed to request_irq() to receive
  *     interrupts from this device.
  * @controller_state: Controller's runtime state
@@ -268,6 +270,10 @@ extern struct spi_master *spi_busnum_to_master(u16 busnum);
  * @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
+ *      transfer. If 0 the default (from spi_device) is used.
+ * @bits_per_word: select a bits_per_word other then 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
  *     (optionally) changing the chipselect status, then starting
@@ -322,7 +328,9 @@ struct spi_transfer {
        dma_addr_t      rx_dma;
 
        unsigned        cs_change:1;
+       u8              bits_per_word;
        u16             delay_usecs;
+       u32             speed_hz;
 
        struct list_head transfer_list;
 };