[PATCH 06/10] spi: dw: introduce support of loopback mode

[Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

For testing purposes it's good to have a loopback mode enabled. The patch adds
necessary bits for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/spi/spi-dw.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index d58edfe..54e195b 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -599,6 +599,9 @@ static int dw_spi_setup(struct spi_device *spi)
 			| (spi->mode  << SPI_MODE_OFFSET)
 			| (chip->tmode << SPI_TMOD_OFFSET);
 
+	if (spi->mode & SPI_LOOP)
+		chip->cr0 |= 1 << SPI_SRL_OFFSET;
+
 	if (gpio_is_valid(spi->cs_gpio)) {
 		ret = gpio_direction_output(spi->cs_gpio,
 				!(spi->mode & SPI_CS_HIGH));
@@ -666,7 +669,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 		goto err_free_master;
 	}
 
-	master->mode_bits = SPI_CPOL | SPI_CPHA;
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
 	master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
 	master->bus_num = dws->bus_num;
 	master->num_chipselect = dws->num_cs;
-- 
2.1.0

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