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refclock_phc: add nocrossts option

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This commit is contained in:
Miroslav Lichvar 2017-01-19 16:28:49 +01:00
parent 50f99ec5f4
commit a60fc73e7b
2 changed files with 8 additions and 5 deletions
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7
doc/chrony.conf.adoc
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@ -402,9 +402,10 @@ refclock SOCK /var/run/chrony.ttyS0.sock
*PHC*::: *PHC*:::
PTP hardware clock (PHC) driver. The parameter is the path to the device of PTP hardware clock (PHC) driver. The parameter is the path to the device of
the PTP clock, which for example can be synchronised by *ptp4l* from the PTP clock, which for example can be synchronised by *ptp4l* from
http://linuxptp.sourceforge.net[*linuxptp*]. PTP clocks are typically kept in http://linuxptp.sourceforge.net[*linuxptp*]. String *:nocrossts* can be
TAI instead of UTC, so the *offset* option should be used to compensate for the appended to the path to disable use of precise cross timestamping. PTP clocks
current UTC-TAI offset. For example: are typically kept in TAI instead of UTC, so the *offset* option should be used
to compensate for the current UTC-TAI offset. For example:
+ +
---- ----
refclock PHC /dev/ptp0 poll 3 dpoll -2 offset -36 refclock PHC /dev/ptp0 poll 3 dpoll -2 offset -36

6
refclock_phc.c
View file

@ -42,6 +42,7 @@
struct phc_instance { struct phc_instance {
int fd; int fd;
int mode; int mode;
int nocrossts;
}; };
static int phc_initialise(RCL_Instance instance) static int phc_initialise(RCL_Instance instance)
@ -61,6 +62,7 @@ static int phc_initialise(RCL_Instance instance)
phc = MallocNew(struct phc_instance); phc = MallocNew(struct phc_instance);
phc->fd = phc_fd; phc->fd = phc_fd;
phc->mode = 0; phc->mode = 0;
phc->nocrossts = RCL_GetDriverOption(instance, "nocrossts") ? 1 : 0;
RCL_SetDriverData(instance, phc); RCL_SetDriverData(instance, phc);
return 1; return 1;
@ -83,8 +85,8 @@ static int phc_poll(RCL_Instance instance)
phc = (struct phc_instance *)RCL_GetDriverData(instance); phc = (struct phc_instance *)RCL_GetDriverData(instance);
if (!SYS_Linux_GetPHCSample(phc->fd, 0, RCL_GetPrecision(instance), &phc->mode, if (!SYS_Linux_GetPHCSample(phc->fd, phc->nocrossts, RCL_GetPrecision(instance),
&phc_ts, &sys_ts, &err)) &phc->mode, &phc_ts, &sys_ts, &err))
return 0; return 0;
offset = UTI_DiffTimespecsToDouble(&phc_ts, &sys_ts); offset = UTI_DiffTimespecsToDouble(&phc_ts, &sys_ts);