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Subject[PATCH v2 4/4] spi: spi-davinci: Add support for SPI_CS_WORD
Date
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>
---
drivers/spi/spi-davinci.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index d502cf504deb..8f7dcbc53c57 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);
}
}
@@ -440,8 +441,12 @@ 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)
@@ -976,7 +981,7 @@ 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;

--
2.17.1
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