On 3/16/2020 1:58 PM, Grygorii Strashko via Linuxptp-devel wrote:
>> This is the userspace program I have worked on to get the synchronization
>> working. Currently the servo part of the tool is in very hacky shape. Before
>> cleanup I wanted to get more inputs on where it can be integrated. But
>> anyways
>> as you said, Ill clean it up and post it as a separate tool. We can then
>> decide
>> the correct location.
>
> And I'd like to rise additional question here.
> The above solution adds PPS generation using PTP_EXTTS events and PIN output,
> but, as per my understanding, there are no way now to feed phc2sys with such
> PPS.
> So question is how PPS generated by PTP_EXTTS events can be wired to phc2sys?
> - option1: update phc2sys to accept PTP_EXTTS as PPS
> - option2: allow kernel PHC to generate or PTP_CLOCK_EXTTS/or
> PTP_CLOCK_PPS/or both
> by somehow configuring that PTP_EXTTSx is also PPS.
> Challenge with option 2 is that Kernel PPS configuration is part of
> ptp_clock_register() and so static.
>
I think a new option that can use PTP_EXTTS as an input, and some option
to specify what the expected period of that signal is, so that any rate
could be used, not just 1 PPS.
So, a variation of option 1, where phc2sys is modified to have a mode
for PTP_EXTTS which is somewhat distinct from PPS mode.
Thanks,
Jake
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