Commit 0240f945 authored by Ricardo Ribalda Delgado's avatar Ricardo Ribalda Delgado Committed by Mark Brown
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spi/xilinx: Support for spi mode LOOP 



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

Signed-off-by: default avatarRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent bca690db

drivers/spi/spi-xilinx.c

+4 −2
Original line number Diff line number Diff line
@@ -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;