diff options
| author | David Lechner <david@lechnology.com> | 2018-09-13 02:39:20 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-09-17 23:19:00 +0200 |
| commit | a3762b13a596642586051d877efc80ff043bc42a (patch) | |
| tree | 211825783b982d4ce886140b299cc8697e25a33c /drivers | |
| parent | Merge tag 'spi-cs-word' into spi-4.20 (diff) | |
| download | linux-a3762b13a596642586051d877efc80ff043bc42a.tar.xz linux-a3762b13a596642586051d877efc80ff043bc42a.zip | |
spi: spi-davinci: Add support for SPI_CS_WORD
This adds support for the SPI_CS_WORD flag to the TI DaVinci SPI
driver. This mode can be used as long as we are using the hardware
chip select and not a GPIO chip select.
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-davinci.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c index ce0e67d4bfb9..205f763c7383 100644 --- a/drivers/spi/spi-davinci.c +++ b/drivers/spi/spi-davinci.c @@ -230,7 +230,8 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value) !(spi->mode & SPI_CS_HIGH)); } else { if (value == BITBANG_CS_ACTIVE) { - spidat1 |= SPIDAT1_CSHOLD_MASK; + if (!(spi->mode & SPI_CS_WORD)) + spidat1 |= SPIDAT1_CSHOLD_MASK; spidat1 &= ~(0x1 << chip_sel); } } @@ -438,8 +439,12 @@ static int davinci_spi_setup(struct spi_device *spi) return retval; } - if (internal_cs) + if (internal_cs) { set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select); + } else if (spi->mode & SPI_CS_WORD) { + dev_err(&spi->dev, "SPI_CS_WORD can't be use with GPIO CS\n"); + return -EINVAL; + } } if (spi->mode & SPI_READY) @@ -974,7 +979,7 @@ static int davinci_spi_probe(struct platform_device *pdev) dspi->prescaler_limit = pdata->prescaler_limit; dspi->version = pdata->version; - dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP; + dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP | SPI_CS_WORD; if (dspi->version == SPI_VERSION_2) dspi->bitbang.flags |= SPI_READY; |