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spi: spidev_test: add support for word delay

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Support setting the word delay using the -w/--word-delay command line
parameter. Note that spidev exposes word delay only as an u8, allowing
for a maximum of 255us of delay to be inserted.

Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
Link: https://patch.msgid.link/20241107-spidev-test-word-delay-v1-1-d4bba5569e39@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jonas Rebmann 2024-11-07 16:07:31 +01:00 committed by Mark Brown
parent c36212b261
commit 3ec83a377a
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GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 2 deletions
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11
tools/spi/spidev_test.c
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@ -42,6 +42,7 @@ static char *input_file;
static char *output_file; static char *output_file;
static uint32_t speed = 500000; static uint32_t speed = 500000;
static uint16_t delay; static uint16_t delay;
static uint16_t word_delay;
static int verbose; static int verbose;
static int transfer_size; static int transfer_size;
static int iterations; static int iterations;
@ -124,6 +125,7 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
.rx_buf = (unsigned long)rx, .rx_buf = (unsigned long)rx,
.len = len, .len = len,
.delay_usecs = delay, .delay_usecs = delay,
.word_delay_usecs = word_delay,
.speed_hz = speed, .speed_hz = speed,
.bits_per_word = bits, .bits_per_word = bits,
}; };
@ -172,11 +174,12 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
static void print_usage(const char *prog) static void print_usage(const char *prog)
{ {
printf("Usage: %s [-2348CDFHILMNORSZbdilopsv]\n", prog); printf("Usage: %s [-2348CDFHILMNORSZbdilopsvw]\n", prog);
puts("general device settings:\n" puts("general device settings:\n"
" -D --device device to use (default /dev/spidev1.1)\n" " -D --device device to use (default /dev/spidev1.1)\n"
" -s --speed max speed (Hz)\n" " -s --speed max speed (Hz)\n"
" -d --delay delay (usec)\n" " -d --delay delay (usec)\n"
" -w --word-delay word delay (usec)\n"
" -l --loop loopback\n" " -l --loop loopback\n"
"spi mode:\n" "spi mode:\n"
" -H --cpha clock phase\n" " -H --cpha clock phase\n"
@ -213,6 +216,7 @@ static void parse_opts(int argc, char *argv[])
{ "device", 1, 0, 'D' }, { "device", 1, 0, 'D' },
{ "speed", 1, 0, 's' }, { "speed", 1, 0, 's' },
{ "delay", 1, 0, 'd' }, { "delay", 1, 0, 'd' },
{ "word-delay", 1, 0, 'w' },
{ "loop", 0, 0, 'l' }, { "loop", 0, 0, 'l' },
{ "cpha", 0, 0, 'H' }, { "cpha", 0, 0, 'H' },
{ "cpol", 0, 0, 'O' }, { "cpol", 0, 0, 'O' },
@ -237,7 +241,7 @@ static void parse_opts(int argc, char *argv[])
}; };
int c; int c;
c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3ZFMNR248p:vS:I:", c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lHOLC3ZFMNR248p:vS:I:",
lopts, NULL); lopts, NULL);
if (c == -1) if (c == -1)
@ -253,6 +257,9 @@ static void parse_opts(int argc, char *argv[])
case 'd': case 'd':
delay = atoi(optarg); delay = atoi(optarg);
break; break;
case 'w':
word_delay = atoi(optarg);
break;
case 'b': case 'b':
bits = atoi(optarg); bits = atoi(optarg);
break; break;