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spi: spidev_test: add compare mode

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Check whether the received data correspond to the transferred data but
without enabling loopback mode in the controller.

This is for testing with TX physically bridged to RX which is useful if
a loopback mode is unavailable or insufficient.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
Link: https://patch.msgid.link/20260924-spi-sun4i-spidev_test-v7-7-126e31a07fdc@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marc Kleine-Budde 2026-09-24 15:43:57 +02:00 committed by Mark Brown
parent 2d736e05db
commit a47226866b
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 3 deletions
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15
tools/spi/spidev_test.c
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@ -44,6 +44,7 @@ static int verbose;
static int transfer_size = -1;
static int iterations;
static int interval = 5; /* interval in seconds for showing transfer rate */
static int compare;
static int random_input;
static int input_choices;
@ -174,7 +175,7 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
if (verbose)
hex_dump(rx, len, 32, "RX");
if (mode & SPI_LOOP) {
if (compare || mode & SPI_LOOP) {
if (memcmp(tx, rx, len)) {
fprintf(stderr, "transfer error !\n");
hex_dump(tx, len, 32, "TX");
@ -186,13 +187,14 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
static void print_usage(const char *prog)
{
printf("Usage: %s [-2348CDFHILMNORSZbdilopsvw]\n", prog);
printf("Usage: %s [-2348CDFHILMNORSZbcdilopsvw]\n", prog);
puts("general device settings:\n"
" -D --device device to use (default /dev/spidev1.1)\n"
" -s --speed max speed (Hz)\n"
" -d --delay delay (usec)\n"
" -w --word-delay word delay (usec)\n"
" -l --loop loopback\n"
" -c --compare compare RX'ed and TX'ed data\n"
"spi mode:\n"
" -H --cpha clock phase\n"
" -O --cpol clock polarity\n"
@ -230,6 +232,7 @@ static void parse_opts(int argc, char *argv[])
{ "delay", 1, 0, 'd' },
{ "word-delay", 1, 0, 'w' },
{ "loop", 0, 0, 'l' },
{ "compare", 0, 0, 'c' },
{ "cpha", 0, 0, 'H' },
{ "cpol", 0, 0, 'O' },
{ "rx-cpha-flip", 0, 0, 'F' },
@ -253,7 +256,7 @@ static void parse_opts(int argc, char *argv[])
};
int c;
c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lHOLC3ZFMNR248p:vS:I:",
c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lcHOLC3ZFMNR248p:vS:I:",
lopts, NULL);
if (c == -1)
@ -285,6 +288,9 @@ static void parse_opts(int argc, char *argv[])
case 'l':
mode |= SPI_LOOP;
break;
case 'c':
compare = 1;
break;
case 'H':
mode |= SPI_CPHA;
break;
@ -466,6 +472,9 @@ int main(int argc, char *argv[])
if (iterations && transfer_size < 0)
pabort("-I (--iter) is only implemented for -S (--size)");
if (compare && mode & (SPI_TX_OCTAL | SPI_TX_QUAD | SPI_TX_DUAL))
pabort("-c (--compare) conflicts with -2 (--dual), -4 (--quad) or -8 (--octal)");
fd = open(device, O_RDWR);
if (fd < 0)
pabort("can't open device");