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>

diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index ce0e67d4bfb9e7fb08d7fa0b35ae06f764e2dcc0..205f763c73838be2ae16d192b596fe8f13731b1a 100644 (file)
--- 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;