[PATCH] SPI: devices can require LSB-first encodings

Add spi_device hook for LSB-first word encoding, and update all the
(in-tree) controller drivers to reject such devices.  Eventually,
some controller drivers will be updated to support lsb-first encodings
on the wire; no current drivers need this.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 082006714b85..77add901691d 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -35,10 +35,13 @@ extern struct bus_type spi_bus_type;
  * @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.
+ *      The "active low" default for chipselect mode can be overridden,
+ *      as can the "MSB first" default for each word in a transfer.
  * @bits_per_word: Data transfers involve one or more words; word sizes
  *      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.
+ *      This may be changed by the device's driver, or left at the
+ *      default (0) indicating protocol words are eight bit bytes.
  *      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.
@@ -67,6 +70,7 @@ struct spi_device {
 #define SPI_MODE_2      (SPI_CPOL|0)
 #define SPI_MODE_3      (SPI_CPOL|SPI_CPHA)
 #define SPI_CS_HIGH     0x04                    /* chipselect active high? */
+#define SPI_LSB_FIRST   0x08                    /* per-word bits-on-wire */
         u8                      bits_per_word;
         int                     irq;
         void                    *controller_state;
@@ -75,7 +79,6 @@ struct spi_device {
 
         // likely need more hooks for more protocol options affecting how
         // the controller talks to each chip, like:
-        //  - bit order (default is wordwise msb-first)
         //  - memory packing (12 bit samples into low bits, others zeroed)
         //  - priority
         //  - drop chipselect after each word