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spi: spidev_test: clarify usage for --size

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By default, spidev_test transmits the predetermined message default_tx.
Given the --size parameter, the given number of random bytes are
transmitted instead.

Make all the input options (random bytes, string, file) mutually
exclusive.

Clarify the help text for --size.

While at it, make the -p help text consistently lowercase.

Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
Link: https://patch.msgid.link/20260924-spi-sun4i-spidev_test-v7-2-126e31a07fdc@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jonas Rebmann 2026-09-24 15:43:52 +02:00 committed by Mark Brown
parent 88ca7a587f
commit a9e74a4c99
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GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 4 deletions
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13
tools/spi/spidev_test.c
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@ -44,6 +44,7 @@ static int verbose;
static int transfer_size;
static int iterations;
static int interval = 5; /* interval in seconds for showing transfer rate */
static int input_choices;
static uint8_t default_tx[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
@ -191,8 +192,8 @@ static void print_usage(const char *prog)
"data:\n"
" -i --input input data from a file (e.g. \"test.bin\")\n"
" -o --output output data to a file (e.g. \"results.bin\")\n"
" -p Send data (e.g. \"1234\\xde\\xad\")\n"
" -S --size transfer size\n"
" -p send data (e.g. \"1234\\xde\\xad\")\n"
" -S --size transfer the given number of random bytes\n"
" -I --iter iterations\n"
"additional parameters:\n"
" -b --bpw bits per word\n"
@ -262,6 +263,7 @@ static void parse_opts(int argc, char *argv[])
break;
case 'i':
input_file = optarg;
input_choices++;
break;
case 'o':
output_file = optarg;
@ -304,6 +306,7 @@ static void parse_opts(int argc, char *argv[])
break;
case 'p':
input_tx = optarg;
input_choices++;
break;
case '2':
mode |= SPI_TX_DUAL;
@ -316,6 +319,7 @@ static void parse_opts(int argc, char *argv[])
break;
case 'S':
transfer_size = atoi(optarg);
input_choices++;
break;
case 'I':
iterations = atoi(optarg);
@ -446,8 +450,9 @@ int main(int argc, char *argv[])
parse_opts(argc, argv);
if (input_tx && input_file)
pabort("only one of -p and --input may be selected");
if (input_choices > 1)
pabort("at most one of -S (--size), -p, -i (--input) may be selected, "
"and each may be specified only once");
fd = open(device, O_RDWR);
if (fd < 0)