diff options
| author | Andreas Larsson <andreas@gaisler.com> | 2013-02-15 19:52:25 +0400 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2013-04-07 13:07:56 +0400 |
| commit | 8922a366ddd20964e3542e12f0315a8a88b3a638 (patch) | |
| tree | f002ba035438fe7586259f24c757b99cff0d6e92 /drivers/spi | |
| parent | c3f3e7717f1cf01d9117a98ed89decc41d7cb5db (diff) | |
| download | linux-8922a366ddd20964e3542e12f0315a8a88b3a638.tar.xz | |
spi/spi-fsl-spi: Add support for setting a maximum number of bits per word
Acked-by: Anton Vorontsov <anton@enomsg.org>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-fsl-lib.h | 1 | ||||
| -rw-r--r-- | 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 5a9c36c7cb68..d5c788b584df 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 b9064434e0f7..7eff63a284ff 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; |