[PATCH v2 08/10] spi/pxa2xx: add support for SPI_LOOP

From: Mika Westerberg
Date: Mon Jan 21 2013 - 04:32:11 EST


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@xxxxxxxxxxxxxxx>
---
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 7fa2e8e..1a56faa 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -854,6 +854,9 @@ 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",
@@ -947,7 +950,7 @@ 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;
--
1.7.10.4

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