spi: add new SPI_CS_WORD flag

This adds a new SPI mode flag, SPI_CS_WORD, that is used to indicate
that a SPI device requires the chip select to be toggled after each
word that is transferred.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index a64235e..7cc1466 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -163,6 +163,7 @@ struct spi_device {
 #define        SPI_TX_QUAD     0x200                   /* transmit with 4 wires */
 #define        SPI_RX_DUAL     0x400                   /* receive with 2 wires */
 #define        SPI_RX_QUAD     0x800                   /* receive with 4 wires */
+#define SPI_CS_WORD    0x1000                  /* toggle cs after each word */
        int                     irq;
        void                    *controller_state;
        void                    *controller_data;
@@ -177,7 +178,6 @@ struct spi_device {
         * the controller talks to each chip, like:
         *  - memory packing (12 bit samples into low bits, others zeroed)
         *  - priority
-        *  - drop chipselect after each word
         *  - chipselect delays
         *  - ...
         */