[PATCH v2 5/7] spi: spi-fsl-spi: Add support for setting a maximum number of bits per word

Andreas Larsson
2013-02-07T13:12:41Z

drivers/spi/spi-fsl-lib.h | 1 +
drivers/spi/spi-fsl-spi.c | 8 +++++++-
2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 5a9c36c..d5c788b 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -71,6 +71,7 @@ struct mpc8xxx_spi {

#ifdef CONFIG_SPI_FSL_SPI
int type;
+ u8 max_bits_per_word;

void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
int bits_per_word, int msb_first);
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index c018e1c..437319f 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -213,7 +213,8 @@ static int fsl_spi_setup_transfer(struct spi_device *spi,

/* Make sure its a bit width we support [4..16, 32] */
if ((bits_per_word < 4)
- || ((bits_per_word > 16) && (bits_per_word != 32)))
+ || ((bits_per_word > 16) && (bits_per_word != 32))
+ || (bits_per_word > mpc8xxx_spi->max_bits_per_word))
return -EINVAL;

if (!hz)
@@ -520,6 +521,7 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
mpc8xxx_spi->spi_remove = fsl_spi_remove;
+ mpc8xxx_spi->max_bits_per_word = 32;
mpc8xxx_spi->type = fsl_spi_get_type(dev);

ret = fsl_spi_cpm_init(mpc8xxx_spi);
@@ -557,6 +559,10 @@ static struct spi_master * fsl_spi_probe(struct device *dev,

/* Enable SPI interface */
regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
+ if (mpc8xxx_spi->max_bits_per_word < 8) {
+ regval &= ~SPMODE_LEN(0xF);
+ regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
+ }
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
regval |= SPMODE_OP;

--
1.7.0.4