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=-4.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 903BCC432BE for ; Sun, 22 Aug 2021 02:31:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7121E61212 for ; Sun, 22 Aug 2021 02:31:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231674AbhHVCbm (ORCPT ); Sat, 21 Aug 2021 22:31:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229571AbhHVCbl (ORCPT ); Sat, 21 Aug 2021 22:31:41 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F4D8C061575; Sat, 21 Aug 2021 19:31:01 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id n18so13228236pgm.12; Sat, 21 Aug 2021 19:31:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=XSTqDa97zOWgSBwGLOjBEzY0W1HCbmfHTpND18fwsyA=; b=PhbRgYaQFfP7M8LtuZ0DJCgRqBc2hijhPP12YvRUKwgoWfGJfWjb4yDuFfii56KLZx UApdP4wFmmp+bk/JkRzpa0RZ0bNMO6dk2YGX3PubQBqiSvbPWBns8puXAyEgDCmG00B7 tr1Ug/czFutolnj2Qe36ZPYYZhOAnccfghpigop6gfOoSkm04XMamwXZxuQ23biWfg5r QTc60M6NIaNGgnBLGkI/blXBoEWtl6MR0PEvsYzfewnZge+ORNa8GokVvugIQtnbX9vk Cb5bInAXy/ZIHsL06t2tqvp3KODH+/9slG/it09ZgKWWEofwipch7QXYfXPvXvEqC1LS OC1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=XSTqDa97zOWgSBwGLOjBEzY0W1HCbmfHTpND18fwsyA=; b=DmYEp0x/TEUY7LIrjMzWGZHl8a19frlrdAtXv8+nlzjJm4dxexJhs+MZktL1dr/IkC H72o2U2Afo/wpUKiIPBeHcwxkmcusm5PJYdp5piEZDGAqgpZTp+PQ8A+MXmPmEuFR9+C sn/icLB46CZ7D85nnAqT58K609vdvowJlKlIVEHIRhNOouchHCO7733GTwec7H26yizo 8m7P05w8uupR6cyP9i4P/nV/gVRl/OqAjgovdx1kHwR/ypc9JFhFOtuhUtymScrL3SGb atXput/w28MJRr3cFhVvq5TRiyx/B+GCc/TV3/Jb1OiJYUyzDhVYV//HaadH8nx6Cmuw zgIw== X-Gm-Message-State: AOAM533WLlAqfnXeJ0JmBEq9+f9bgjbkdGE3jCnlsnMspVdlEHfo4tH7 iwOBr3Pek7YaLRDluE7NsBY= X-Google-Smtp-Source: ABdhPJwWkVfbhs8JZCkYB40Ea1nyaA/y97j+qEa6V5jVVdosZTc+l16NXyb9birWU12gqKpy95GIYQ== X-Received: by 2002:a63:2541:: with SMTP id l62mr26438157pgl.183.1629599460655; Sat, 21 Aug 2021 19:31:00 -0700 (PDT) Received: from hoboy.vegasvil.org ([2601:645:c000:2163:e2d5:5eff:fea5:802f]) by smtp.gmail.com with ESMTPSA id mq18sm9743976pjb.45.2021.08.21.19.30.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Aug 2021 19:31:00 -0700 (PDT) Date: Sat, 21 Aug 2021 19:30:57 -0700 From: Richard Cochran To: "Machnikowski, Maciej" Cc: "Kubalewski, Arkadiusz" , "linux-kernel@vger.kernel.org" , "intel-wired-lan@lists.osuosl.org" , "netdev@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "Brandeburg, Jesse" , "Nguyen, Anthony L" , "davem@davemloft.net" , "kuba@kernel.org" , "shuah@kernel.org" , "arnd@arndb.de" , "nikolay@nvidia.com" , "cong.wang@bytedance.com" , "colin.king@canonical.com" , "gustavoars@kernel.org" , "Bross, Kevin" , "Stanton, Kevin B" , Ahmad Byagowi Subject: Re: [RFC net-next 1/7] ptp: Add interface for acquiring DPLL state Message-ID: <20210822023057.GA6481@hoboy.vegasvil.org> References: <20210816160717.31285-1-arkadiusz.kubalewski@intel.com> <20210816160717.31285-2-arkadiusz.kubalewski@intel.com> <20210816235400.GA24680@hoboy.vegasvil.org> <20210818170259.GD9992@hoboy.vegasvil.org> <20210819153414.GC26242@hoboy.vegasvil.org> <20210820155538.GB9604@hoboy.vegasvil.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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