The patch titled
spi_mpc83xx: support for lsb-first transfers
has been added to the -mm tree. Its filename is
spi_mpc83xx-support-for-lsb-first-transfers.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: spi_mpc83xx: support for lsb-first transfers
From: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
This controller supports LSB-first transfers; let drivers use them.
Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
Acked-by: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi_mpc83xx.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff -puN drivers/spi/spi_mpc83xx.c~spi_mpc83xx-support-for-lsb-first-transfers drivers/spi/spi_mpc83xx.c
--- a/drivers/spi/spi_mpc83xx.c~spi_mpc83xx-support-for-lsb-first-transfers
+++ a/drivers/spi/spi_mpc83xx.c
@@ -153,13 +153,16 @@ static void mpc83xx_spi_chipselect(struc
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 sp
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 sp
}
/* 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)
{
_
Patches currently in -mm which might be from avorontsov@xxxxxxxxxxxxx are
spi_mpc83xx-turn-off-spi-unit-while-switching-mode.patch
spi_mpc83xx-get-rid-of-magic-numbers.patch
spi_mpc83xx-support-for-lsb-first-transfers.patch
spi_mpc83xx-fix-qelsb-mode-shifts.patch
-
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