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| author | Oleksij Rempel <o.rempel@pengutronix.de> | 2017-07-25 09:57:08 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-07-26 13:08:56 +0100 |
| commit | 8bc85a871436525cc38f819bbc122d216730e905 (patch) | |
| tree | c066f3bb9a5840110bd0d1fc6b36d6482d81b865 /drivers/spi/spi-loopback-test.c | |
| parent | 59a8831da31ebdabf82cac82bf01270d215bf149 (diff) | |
| download | lwn-8bc85a871436525cc38f819bbc122d216730e905.tar.gz lwn-8bc85a871436525cc38f819bbc122d216730e905.zip | |
spi: loopback-test: implement testing with no CS
To run spi-loopback-tests on HW without modifications, we need to
disable Chip Select. This should avoid surprising side effects for
SPI devices by testing patterns.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-loopback-test.c')
| -rw-r--r-- | drivers/spi/spi-loopback-test.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c index 64a1e6f212c1..bed7403bb6b3 100644 --- a/drivers/spi/spi-loopback-test.c +++ b/drivers/spi/spi-loopback-test.c @@ -57,6 +57,11 @@ MODULE_PARM_DESC(loop_req, "if set controller will be asked to enable test loop mode. " \ "If controller supported it, MISO and MOSI will be connected"); +static int no_cs; +module_param(no_cs, int, 0); +MODULE_PARM_DESC(no_cs, + "if set Chip Select (CS) will not be used"); + /* run only a specific test */ static int run_only_test = -1; module_param(run_only_test, int, 0); @@ -319,11 +324,12 @@ static int spi_loopback_test_probe(struct spi_device *spi) { int ret; - if (loop_req) { - spi->mode = SPI_LOOP | spi->mode; + if (loop_req || no_cs) { + spi->mode |= loop_req ? SPI_LOOP : 0; + spi->mode |= no_cs ? SPI_NO_CS : 0; ret = spi_setup(spi); if (ret) { - dev_err(&spi->dev, "SPI setup with SPI_LOOP failed (%d)\n", + dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n", ret); return ret; } |