From b833172fd8f44fb56e0b3cb810155a6baecc65dc Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 22 Jan 2013 12:26:31 +0200 Subject: [PATCH] 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 Tested-by: Lu Cao Signed-off-by: Mark Brown --- drivers/spi/spi-pxa2xx.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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; -- GitLab