From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from vps0.lunn.ch (vps0.lunn.ch [156.67.10.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C32FB455612; Sun, 11 Oct 2026 13:51:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=156.67.10.101 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791726679; cv=none; b=kNV5g9O8x766OZ3YMQ3zmd0NFQmdWNdevX9FOnp7Gnc5ICn4XrfAdpZZh/GZkvGkO4lPD9twAeakdMlKTAPoL2/O4HawQ8rpIhyU4a38qxO1NE4Q2HyvvhGbo3oUPPG0UVwuFVfT7o6My+z2Ry4J39O+PpmiEl/1TOUcnqdRDHc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791726679; c=relaxed/simple; bh=n/eKku/HXyb2EcXGi7lgwA3jWDrjTcnj+3b7gqZDiM8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ScHH8oHExTNmkisNSqH/G5Anva1NKJ1XXLifUeVQYA/DXwHyXp8MhZhS9BLWlCWx0CBncXi7BBFHJJG9oREWQJx3jQSqcqGd2sOFFmmd+0KIkn8O7SPnFItyJckv8mzPAZxVMLdNghxaYvONBBumt+tw5Q4Cj9DcmORoL23ixCo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch; spf=pass smtp.mailfrom=lunn.ch; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b=SrqZnvuy; arc=none smtp.client-ip=156.67.10.101 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lunn.ch Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="SrqZnvuy" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Transfer-Encoding:Content-Disposition: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:From: Sender:Reply-To:Subject:Date:Message-ID:To:Cc:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Content-Disposition: In-Reply-To:References; bh=kePRgEFQ6fN1SssKO5+Z8skr9RxgziDKNM9ANVVAz5k=; b=Sr qZnvuycRSL+AzI92lqFvLx04fsbmfxHFC/tpRpc4cC/73dzZWIL4zG56Gv3o+YyyEDOf6qu0+MoW/ 93ebebmXBPYUdv55NlW99E6k/eadv+ql8sCrT09rFFv927q8NFdGPx4nP0GDRdUKadXCTx4qxPMuy h25NUmB6G3iE8Xw=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1xFtx5-00A6U6-W1; Sun, 11 Oct 2026 15:50:59 +0200 Date: Sun, 11 Oct 2026 15:50:59 +0200 From: Andrew Lunn To: James Clark Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Andrew Lunn , Heiner Kallweit , Richard Cochran , Florian Fainelli , Doug Berger , Nicolai Buchwitz , =?iso-8859-1?Q?Th=E9o?= Lebrun , Russell King , Conor Dooley , Broadcom internal kernel review list , Thomas Gleixner , Miroslav Lichvar , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next 0/5] net: mdio: add timestamped MDIO writes for PHY gettimex64 Message-ID: <804e7c63-e762-4040-9d60-35d21df75531@lunn.ch> References: <20261009143506.2507607-1-jjc@jclark.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20261009143506.2507607-1-jjc@jclark.com> > For example, using PTP_SYS_OFFSET_EXTENDED on the Raspberry Pi CM5 to > synchronize the system clock from the BCM54210PE PHY PHC leads to the > system clock being 32 µs ahead of the PHC. On the CM4, it is about 7 µs. > (The difference is because the MDIO clock frequency is higher on the > CM4: 10 MHz as opposed to 2.08 MHz on the CM5.) IEEE 802.3 says the clock should be 2.5Mhz. Does the CM4 use a clock-frequency DT property to enable this faster clock? Andrew