Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=32421daaf8236b0fd6e032f6b1dd8086ccae2a46
Commit:     32421daaf8236b0fd6e032f6b1dd8086ccae2a46
Parent:     20ba09b979f7e1de790968a9175c6caceda00261
Author:     Anton Vorontsov <[EMAIL PROTECTED]>
AuthorDate: Tue Jul 31 00:38:41 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Jul 31 15:39:39 2007 -0700

    spi_mpc83xx: support for lsb-first transfers
    
    This controller supports LSB-first transfers; let drivers use them.
    
    Signed-off-by: Anton Vorontsov <[EMAIL PROTECTED]>
    Acked-by: Kumar Gala <[EMAIL PROTECTED]>
    Signed-off-by: David Brownell <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 drivers/spi/spi_mpc83xx.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index e2d8dbc..18c475d 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -153,13 +153,16 @@ static void mpc83xx_spi_chipselect(struct spi_device 
*spi, int value)
                        len = len - 1;
 
                /* mask out bits we are going to set */
-               regval &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH |
-                           SPMODE_LEN(0xF) | SPMODE_DIV16 | SPMODE_PM(0xF));
+               regval &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
+                               | SPMODE_LEN(0xF) | SPMODE_DIV16
+                               | SPMODE_PM(0xF) | SPMODE_REV);
 
                if (spi->mode & SPI_CPHA)
                        regval |= SPMODE_CP_BEGIN_EDGECLK;
                if (spi->mode & SPI_CPOL)
                        regval |= SPMODE_CI_INACTIVEHIGH;
+               if (!(spi->mode & SPI_LSB_FIRST))
+                       regval |= SPMODE_REV;
 
                regval |= SPMODE_LEN(len);
 
@@ -248,9 +251,11 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, 
struct spi_transfer *t)
 
        regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
 
-       /* Mask out bits_per_wordgth */
-       regval &= ~SPMODE_LEN(0xF);
+       /* mask out bits we are going to set */
+       regval &= ~(SPMODE_LEN(0xF) | SPMODE_REV);
        regval |= SPMODE_LEN(bits_per_word);
+       if (!(spi->mode & SPI_LSB_FIRST))
+               regval |= SPMODE_REV;
 
        /* Turn off SPI unit prior changing mode */
        mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0);
@@ -260,7 +265,7 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, 
struct spi_transfer *t)
 }
 
 /* the spi->mode bits understood by this driver: */
-#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
+#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST)
 
 static int mpc83xx_spi_setup(struct spi_device *spi)
 {
-
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