From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 32C89C76192 for ; Wed, 17 Jul 2019 06:53:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 17DA720818 for ; Wed, 17 Jul 2019 06:53:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726932AbfGQGw7 (ORCPT ); Wed, 17 Jul 2019 02:52:59 -0400 Received: from mga04.intel.com ([192.55.52.120]:8898 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725873AbfGQGw7 (ORCPT ); Wed, 17 Jul 2019 02:52:59 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jul 2019 23:52:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,273,1559545200"; d="scan'208";a="167877794" Received: from pipin.fi.intel.com (HELO pipin) ([10.237.72.175]) by fmsmga008.fm.intel.com with ESMTP; 16 Jul 2019 23:52:55 -0700 From: Felipe Balbi To: Richard Cochran Cc: netdev@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , x86@kernel.org, linux-kernel@vger.kernel.org, "Christopher S . Hall" Subject: Re: [RFC PATCH 0/5] PTP: add support for Intel's TGPIO controller In-Reply-To: <20190716164123.GB2125@localhost> References: <20190716072038.8408-1-felipe.balbi@linux.intel.com> <20190716164123.GB2125@localhost> Date: Wed, 17 Jul 2019 09:52:55 +0300 Message-ID: <87ef2p2lvc.fsf@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi, Richard Cochran writes: > On Tue, Jul 16, 2019 at 10:20:33AM +0300, Felipe Balbi wrote: >> TGPIO is a new IP which allows for time synchronization between systems >> without any other means of synchronization such as PTP or NTP. The >> driver is implemented as part of the PTP framework since its features >> covered most of what this controller can do. > > Can you provide some background on this new HW? Is the interface > copper wires between chips? Or is it perhaps coax between hosts? It's just a pin, like a GPIO. So it would be a PCB trace, flat flex, copper wire... Anything, really. I think most of the usecases will involve devices somehow on the same PCB, so a trace or flat flex would be more common. Perhaps Chris has a better idea in mind? :-) -- balbi