Commit a3762b13 authored by David Lechner's avatar David Lechner Committed by Mark Brown

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: default avatarDavid Lechner <david@lechnology.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 92636966
...@@ -230,6 +230,7 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value) ...@@ -230,6 +230,7 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
!(spi->mode & SPI_CS_HIGH)); !(spi->mode & SPI_CS_HIGH));
} else { } else {
if (value == BITBANG_CS_ACTIVE) { if (value == BITBANG_CS_ACTIVE) {
if (!(spi->mode & SPI_CS_WORD))
spidat1 |= SPIDAT1_CSHOLD_MASK; spidat1 |= SPIDAT1_CSHOLD_MASK;
spidat1 &= ~(0x1 << chip_sel); spidat1 &= ~(0x1 << chip_sel);
} }
...@@ -438,8 +439,12 @@ static int davinci_spi_setup(struct spi_device *spi) ...@@ -438,8 +439,12 @@ static int davinci_spi_setup(struct spi_device *spi)
return retval; return retval;
} }
if (internal_cs) if (internal_cs) {
set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select); 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) if (spi->mode & SPI_READY)
...@@ -974,7 +979,7 @@ static int davinci_spi_probe(struct platform_device *pdev) ...@@ -974,7 +979,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
dspi->prescaler_limit = pdata->prescaler_limit; dspi->prescaler_limit = pdata->prescaler_limit;
dspi->version = pdata->version; 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) if (dspi->version == SPI_VERSION_2)
dspi->bitbang.flags |= SPI_READY; dspi->bitbang.flags |= SPI_READY;
......
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