linux-kernel - [PATCH 09/11] spi/pxa2xx: add support for SPI

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Date:	Mon,  7 Jan 2013 12:44:38 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	grant.likely@...retlab.ca, linus.walleij@...aro.org,
	eric.y.miao@...il.com, linux@....linux.org.uk,
	haojian.zhuang@...il.com, broonie@...nsource.wolfsonmicro.com,
	chao.bi@...el.com,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 09/11] 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@...ux.intel.com>
---
 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 f36d7c3..cfc4444 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1813,6 +1813,9 @@ 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",
@@ -1906,7 +1909,7 @@ 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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