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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>
This commit is contained in:
Oleksij Rempel 2017-07-25 09:57:08 +02:00 committed by Mark Brown
parent 59a8831da3
commit 8bc85a8714
1 changed files with 9 additions and 3 deletions
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12
drivers/spi/spi-loopback-test.c
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@ -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;
}