> -----Original Message-----
> From: Miroslav Lichvar <mlich...@redhat.com>
> Sent: Wednesday, July 20, 2022 1:04 AM
> To: Richard Cochran <richardcoch...@gmail.com>
> Cc: Keller, Jacob E <jacob.e.kel...@intel.com>; linuxptp-
> us...@lists.sourceforge.net
> Subject: Re: [Linuxptp-users] Adding software-transmit
> (SOF_TIMESTAMPING_TX_SOFTWARE) capability to driver
>
> On Tue, Jul 19, 2022 at 09:02:37PM -0700, Richard Cochran wrote:
> > > I am not sure how accurate a software timestamp for a wifi device would
> > > be, given the potential delay between timestamp and actual transmission.
> >
> > WiFi on Linux is never going to support PTP. The issue is the closed
> > source radio firmware. End of story.
>
> I tested driver TX timestamping in the mt76 driver, where the firmware
> is supposed to be very simple, but IIRC it didn't make a noticeable
> difference when compared to user-space TX timestamping.
>
> But if there is demand, I think we could see wireless chips with
> HW-timestamping support in future. If the stations can hear each
> other, maybe it wouldn't even be necessary for the access point to
> support PTP, like when using a cheap Ethernet hub instead of expensive
> switch with PTP support.
>
> --
> Miroslav Lichvar
Right that's what I was afraid of: its basically just the same as software
timestamping.
Thanks,
Jake
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