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>
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index d4edeee..e1d9a20 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -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 @@
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 @@
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;