diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2013-01-22 14:26:31 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-02-08 16:15:36 +0400 |
| commit | b833172fd8f44fb56e0b3cb810155a6baecc65dc (patch) | |
| tree | c3a23b30586ad61259e6438358c20b82df0ecbbc | |
| parent | 7d94a50585884180a487ce17e8ddbfa37f7694b6 (diff) | |
| download | linux-b833172fd8f44fb56e0b3cb810155a6baecc65dc.tar.xz | |
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: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Lu Cao <lucao@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 7f8f939835fd..8a5ba0aa095a 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -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; |