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From: Richard Cochran <richardcochran@gmail.com>
To: "Machnikowski, Maciej" <maciej.machnikowski@intel.com>
Cc: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"intel-wired-lan@lists.osuosl.org"
	<intel-wired-lan@lists.osuosl.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-kselftest@vger.kernel.org"
	<linux-kselftest@vger.kernel.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
	"Nguyen, Anthony L" <anthony.l.nguyen@intel.com>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"shuah@kernel.org" <shuah@kernel.org>,
	"arnd@arndb.de" <arnd@arndb.de>,
	"nikolay@nvidia.com" <nikolay@nvidia.com>,
	"cong.wang@bytedance.com" <cong.wang@bytedance.com>,
	"colin.king@canonical.com" <colin.king@canonical.com>,
	"gustavoars@kernel.org" <gustavoars@kernel.org>,
	"Bross, Kevin" <kevin.bross@intel.com>,
	"Stanton, Kevin B" <kevin.b.stanton@intel.com>,
	Ahmad Byagowi <abyagowi@fb.com>
Subject: Re: [RFC net-next 1/7] ptp: Add interface for acquiring DPLL state
Date: Sat, 21 Aug 2021 19:30:57 -0700	[thread overview]
Message-ID: <20210822023057.GA6481@hoboy.vegasvil.org> (raw)
In-Reply-To: <PH0PR11MB49518ED9AAF8B543FD8324B9EAC19@PH0PR11MB4951.namprd11.prod.outlook.com>

On Fri, Aug 20, 2021 at 06:30:02PM +0000, Machnikowski, Maciej wrote:

> Since the 40.5.2 is not applicable to higher-speed ethernet which
> don't use auto-negotiation, but rather the link training sequence
> where the RX side always syncs its clock to the TX side.

By "the RX side always syncs its clock to the TX side" do you mean the
RX channel synchronizes to the link partner's TX channel?

Wow, that brings back the 100 megabit scheme I guess.  That's cool,
because the same basic idea applies to the PHYTER then.

Still we are doing to need a way for user space to query the HW
topology to discover whether a given ports may be syntonized from a
second port.  I don't think your pin selection thing works unless user
space can tell what the pins are connected to.

Thanks,
Richard

  parent reply	other threads:[~2021-08-22  2:31 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16 16:07 [RFC net-next 0/7] Add basic SyncE interfaces Arkadiusz Kubalewski
2021-08-16 16:07 ` [RFC net-next 1/7] ptp: Add interface for acquiring DPLL state Arkadiusz Kubalewski
2021-08-16 23:54   ` Richard Cochran
2021-08-17  9:41     ` Machnikowski, Maciej
2021-08-18 17:02       ` Richard Cochran
2021-08-18 18:14         ` [Intel-wired-lan] " Keller, Jacob E
2021-08-18 22:36         ` Machnikowski, Maciej
2021-08-19 15:34           ` Richard Cochran
2021-08-19 15:40             ` Machnikowski, Maciej
2021-08-20 15:55               ` Richard Cochran
2021-08-20 18:30                 ` Machnikowski, Maciej
2021-08-22  1:50                   ` Richard Cochran
2021-08-22  2:30                   ` Richard Cochran [this message]
2021-08-23  8:29                     ` Machnikowski, Maciej
2021-08-30 21:06                   ` Richard Cochran
2021-08-31  9:29                     ` Machnikowski, Maciej
2021-08-16 16:07 ` [RFC net-next 2/7] selftests/ptp: Add usage of PTP_DPLL_GETSTATE ioctl in testptp Arkadiusz Kubalewski
2021-08-16 23:54   ` Richard Cochran
2021-08-16 16:07 ` [RFC net-next 3/7] ice: add get_dpll_state ptp interface usage Arkadiusz Kubalewski
2021-08-16 16:07 ` [RFC net-next 4/7] net: add ioctl interface for recover reference clock on netdev Arkadiusz Kubalewski
2021-08-16 19:46   ` Arnd Bergmann
2021-08-17 10:35     ` Kubalewski, Arkadiusz
2021-08-22  1:25   ` Richard Cochran
2021-08-16 16:07 ` [RFC net-next 5/7] selftests/net: Add test app for SIOC{S|G}SYNCE Arkadiusz Kubalewski
2021-08-16 16:07 ` [RFC net-next 6/7] ice: add SIOC{S|G}SYNCE interface usage to recover reference signal Arkadiusz Kubalewski
2021-08-16 16:07 ` [RFC net-next 7/7] ice: add sysfs interface to configure PHY recovered " Arkadiusz Kubalewski
2021-08-18 17:05 ` [RFC net-next 0/7] Add basic SyncE interfaces Richard Cochran
2021-08-18 17:08 ` Richard Cochran

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