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    Subject[PATCH 01/18] spi/xilinx: Support for spi mode LSB_FIRST
    Date
    Hardware supports LSB_FIRST mode. Support it also in the driver.

    Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
    ---
    drivers/spi/spi-xilinx.c | 7 +++++--
    1 file changed, 5 insertions(+), 2 deletions(-)

    diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
    index 79bd84f..d4edeee 100644
    --- a/drivers/spi/spi-xilinx.c
    +++ b/drivers/spi/spi-xilinx.c
    @@ -34,7 +34,8 @@
    #define XSPI_CR_MASTER_MODE 0x04
    #define XSPI_CR_CPOL 0x08
    #define XSPI_CR_CPHA 0x10
    -#define XSPI_CR_MODE_MASK (XSPI_CR_CPHA | XSPI_CR_CPOL)
    +#define XSPI_CR_MODE_MASK (XSPI_CR_CPHA | XSPI_CR_CPOL | \
    + XSPI_CR_LSB_FIRST)
    #define XSPI_CR_TXFIFO_RESET 0x20
    #define XSPI_CR_RXFIFO_RESET 0x40
    #define XSPI_CR_MANUAL_SSELECT 0x80
    @@ -194,6 +195,8 @@ static void xilinx_spi_chipselect(struct spi_device *spi, int is_on)
    cr |= XSPI_CR_CPHA;
    if (spi->mode & SPI_CPOL)
    cr |= XSPI_CR_CPOL;
    + if (spi->mode & SPI_LSB_FIRST)
    + cr |= XSPI_CR_LSB_FIRST;
    xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET);

    /* We do not check spi->max_speed_hz here as the SPI clock
    @@ -353,7 +356,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
    return -ENODEV;

    /* the spi->mode bits understood by this driver: */
    - master->mode_bits = SPI_CPOL | SPI_CPHA;
    + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;

    xspi = spi_master_get_devdata(master);
    xspi->bitbang.master = master;
    --
    2.1.4


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