diff options
| author | Martin Kaiser <martin@kaiser.cx> | 2016-09-01 22:39:58 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-09-14 18:06:16 +0100 |
| commit | 15ca92156e6242060dff91c8d8e7fe7ae82d424a (patch) | |
| tree | 7a0685a057b2d135115fc03afcfc64a70e547b7d | |
| parent | 2636ba8fa39915c7b8d73166961ebbb4c14251cd (diff) | |
spi: imx: support loopback mode on imx35
imx35 and compatible chipsets support loopback mode by setting a
loopback control bit in the test register. Make this setting available
for data transfers, similar to what we do for imx51.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-imx.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 5cc72be30744..53e7a326c213 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -455,6 +455,9 @@ static void mx51_ecspi_reset(struct spi_imx_data *spi_imx) #define MX31_CSPISTATUS 0x14 #define MX31_STATUS_RR (1 << 3) +#define MX31_CSPI_TESTREG 0x1C +#define MX31_TEST_LBC (1 << 14) + /* These functions also work for the i.MX35, but be aware that * the i.MX35 has a slightly different register layout for bits * we do not use here. @@ -510,6 +513,13 @@ static int mx31_config(struct spi_device *spi, struct spi_imx_config *config) writel(reg, spi_imx->base + MXC_CSPICTRL); + reg = readl(spi_imx->base + MX31_CSPI_TESTREG); + if (spi->mode & SPI_LOOP) + reg |= MX31_TEST_LBC; + else + reg &= ~MX31_TEST_LBC; + writel(reg, spi_imx->base + MX31_CSPI_TESTREG); + return 0; } @@ -1186,7 +1196,7 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message; spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - if (is_imx51_ecspi(spi_imx)) + if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx)) spi_imx->bitbang.master->mode_bits |= SPI_LOOP; init_completion(&spi_imx->xfer_done); |