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Commit b833172f authored by Mika Westerberg's avatar Mika Westerberg Committed by Mark Brown
Browse files

spi/pxa2xx: add support for SPI_LOOP 



This is useful when testing the functionality of the controller from userspace
and there aren't any real SPI slave devices connected to the bus.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: default avatarLu Cao <lucao@marvell.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 7d94a505

drivers/spi/spi-pxa2xx.c

+4 −1
Original line number Diff line number Diff line
@@ -846,6 +846,9 @@ static int setup(struct spi_device *spi) 
	chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)

			| (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);



	if (spi->mode & SPI_LOOP)

		chip->cr1 |= SSCR1_LBM;



	/* NOTE:  PXA25x_SSP _could_ use external clocking ... */

	if (!pxa25x_ssp_comp(drv_data))

		dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
@@ -939,7 +942,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) 
	master->dev.parent = &pdev->dev;

	master->dev.of_node = pdev->dev.of_node;

	/* the spi->mode bits understood by this driver: */

	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;



	master->bus_num = ssp->port_id;

	master->num_chipselect = platform_info->num_chipselect;