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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2014-09-18 20:08:56 +0300
committerMark Brown <broonie@kernel.org>2014-09-24 09:49:09 +0100
commitc3ce15bf2ae5cde3392944ad043b80f123510cde (patch)
tree44413c5005d7864c6e8d62f66925a9c15350b6af /drivers/spi/spi-dw.c
parent8e45ef682cb31fda62ed4eeede5d9745a0a1b1e2 (diff)
spi: dw: introduce support of loopback mode
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@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-dw.c')
-rw-r--r--drivers/spi/spi-dw.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index e2f7c5c0f4ba..7064cd008539 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -591,6 +591,9 @@ 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));
@@ -652,7 +655,7 @@ 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;