linux-kernel - RE: [PATCH net-next v1 1/2] dpll: add Embedded SYNC feature for a pin

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Message-ID: <DM6PR11MB46574D49F2601C4E3538FB779B8D2@DM6PR11MB4657.namprd11.prod.outlook.com>
Date: Tue, 20 Aug 2024 13:01:10 +0000
From: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"vadim.fedorenko@...ux.dev" <vadim.fedorenko@...ux.dev>, "jiri@...nulli.us"
	<jiri@...nulli.us>, "corbet@....net" <corbet@....net>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "donald.hunter@...il.com"
	<donald.hunter@...il.com>, "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
	"Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Loktionov,
 Aleksandr" <aleksandr.loktionov@...el.com>
Subject: RE: [PATCH net-next v1 1/2] dpll: add Embedded SYNC feature for a pin

>From: Jakub Kicinski <kuba@...nel.org>
>Sent: Saturday, August 10, 2024 6:16 AM
>
>On Thu,  8 Aug 2024 13:20:12 +0200 Arkadiusz Kubalewski wrote:
>> +Device may provide ability to use Embedded SYNC feature. It allows
>> +to embed additional SYNC signal into the base frequency of a pin - a one
>> +special pulse of base frequency signal every time SYNC signal pulse
>> +happens. The user can configure the frequency of Embedded SYNC.
>> +The Embedded SYNC capability is always related to a given base frequency
>> +and HW capabilities. The user is provided a range of embedded sync
>> +frequencies supported, depending on current base frequency configured for
>> +the pin.
>
>Interesting, noob question perhaps, is the signal somehow well
>known or the implementation is vendor specific so both ends have
>to be from the same vendor? May be worth calling that out, either way.

Unfortunately, I don't have good answer for your question. I went over docs
from 4 vendors of Network Synchronizer Integrated Circuits and only one
supported it.

I also haven't heard anything about standardized way for this, but I believe it
is hard to call it vendor specific solution - IMHO there is nothing fancy that
would make it hard for different vendors to implement/use. The "special"
pulse-ratio and embedded sync frequency seems to be all the info needed to
configure both ends.

Thank you!
Arkadiusz