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sys_linux: don't require configurable pin for external PPS

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Some PHCs that have a PPS input don't have configurable pins (their
function is hardcoded). Accept a negative pin index to skip the pin
configuration before requesting external timestamping.
This commit is contained in:
Miroslav Lichvar
2022-02-23 11:31:24 +01:00
parent 663dde1ad7
commit 3196630fb9
2 changed files with 5 additions and 3 deletions
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2
sys_linux.c
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@@ -1008,7 +1008,7 @@ SYS_Linux_SetPHCExtTimestamping(int fd, int pin, int channel,
pin_desc.func = enable ? PTP_PF_EXTTS : PTP_PF_NONE;
pin_desc.chan = channel;
if (ioctl(fd, PTP_PIN_SETFUNC, &pin_desc)) {
if (pin >= 0 && ioctl(fd, PTP_PIN_SETFUNC, &pin_desc)) {
DEBUG_LOG("ioctl(%s) failed : %s", "PTP_PIN_SETFUNC", strerror(errno));
return 0;
}