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spi/xilinx: Support for spi mode LOOP 

Hardware supports LOOP mode. Support it also in the driver.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ricardo Ribalda Delgado 2015-01-23 17:08:34 +01:00 committed by Mark Brown
parent bca690db90
commit 0240f94516
1 changed files with 4 additions and 2 deletions
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6
drivers/spi/spi-xilinx.c
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@ -35,7 +35,7 @@
#define XSPI_CR_CPOL 0x08
#define XSPI_CR_CPHA 0x10
#define XSPI_CR_MODE_MASK (XSPI_CR_CPHA | XSPI_CR_CPOL | \
XSPI_CR_LSB_FIRST)
XSPI_CR_LSB_FIRST | XSPI_CR_LOOP)
#define XSPI_CR_TXFIFO_RESET 0x20
#define XSPI_CR_RXFIFO_RESET 0x40
#define XSPI_CR_MANUAL_SSELECT 0x80
@ -197,6 +197,8 @@ static void xilinx_spi_chipselect(struct spi_device *spi, int is_on)
cr |= XSPI_CR_CPOL;
if (spi->mode & SPI_LSB_FIRST)
cr |= XSPI_CR_LSB_FIRST;
if (spi->mode & SPI_LOOP)
cr |= XSPI_CR_LOOP;
xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET);
/* We do not check spi->max_speed_hz here as the SPI clock
@ -356,7 +358,7 @@ 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 | SPI_LSB_FIRST;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_LOOP;
xspi = spi_master_get_devdata(master);
xspi->bitbang.master = master;