From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B1AC6176AC8; Mon, 21 Jul 2025 12:23:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753100632; cv=none; b=A/31OfZPzCi5h/hOWUM7goRgfjZ3gI6l8sV6+UKXIxCoXhZ6jmqF+mVTR8hhomconEkSJdtca/uE9OYk+bh62NdsxeHP5SwADkQabH6cqfNbnYlomfsmMYB7J8MNqOfHzA0SgRRJV+SrdzZEWOuQXdDixR1O+7JwlM2gmMlheJ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753100632; c=relaxed/simple; bh=lK05y5EfyxlFdSQJMti7U0pF1916g64aU29cskH7E+E=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ZQG77On6In6+53CEQCutU2Jo0rlwo72q/TNfn5KdzgyANjmuLUgA9oNPhWjcgtjDKtM05DY4LryqrY7g5Vs0YC85vL6IdZQo8bUrG321j2VhLwArgkqSvjKmvik+gLquoAK/COJ9U2ZIYf6/JQ0c3U8dfxe3YHXSA6QSrLzKyb8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s7fGIw3N; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="s7fGIw3N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FFF3C4CEED; Mon, 21 Jul 2025 12:23:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753100632; bh=lK05y5EfyxlFdSQJMti7U0pF1916g64aU29cskH7E+E=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=s7fGIw3NZXpV2Fk5Vf1Kp4PwBNjcUE/L3hCyjNwqc3Ozv0XfB3nd9uMQK7Bg/O6SY OYtkV655pHUDzzj1Wwkl6wtoCxSHtAtLpt9xyro42qX8YPEyMEveR2d1rOE71j7jzU hQm2zEAgDgYkqLzGELqH0oawrBvuVgntZCUEtIWBvQaZNQ+9U2PY4V3anZJBvKsSbt p8KaRnJJTUXrwQHmCdGDIr+uX8no7K8V/gDFsPLSul2hohIXNarZ991ImIBE6senma +nXfWRemvRin4baWmcZh4STewq3NEjhwDChCH28sQgN5q6W6msTKXq4APBo+b+opzp uYfmOfjWQcxQA== Message-ID: <79e28c65-8dbe-4449-b795-645029c37f88@kernel.org> Date: Mon, 21 Jul 2025 14:23:45 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 net-next 02/14] dt-bindings: net: add nxp,netc-timer property To: Vladimir Oltean , "richardcochran@gmail.com" Cc: Wei Fang , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , Claudiu Manoil , Clark Wang , "andrew+netdev@lunn.ch" , "davem@davemloft.net" , "edumazet@google.com" , "kuba@kernel.org" , "pabeni@redhat.com" , "vadim.fedorenko@linux.dev" , Frank Li , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "festevam@gmail.com" , "F.S. Peng" , "devicetree@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "imx@lists.linux.dev" , "kernel@pengutronix.de" References: <20250716073111.367382-1-wei.fang@nxp.com> <20250716073111.367382-3-wei.fang@nxp.com> <20250717-sceptical-quoll-of-protection-9c2104@kuoka> <20250717-masterful-uppish-impala-b1d256@kuoka> <20250718-enchanted-cornflower-llama-f7baea@kuoka> <20250718120105.b42gyo7ywj42fcw4@skbuf> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJoF1BKBQkWlnSaAAoJEBuTQ307 QWKbHukP/3t4tRp/bvDnxJfmNdNVn0gv9ep3L39IntPalBFwRKytqeQkzAju0whYWg+R/rwp +r2I1Fzwt7+PTjsnMFlh1AZxGDmP5MFkzVsMnfX1lGiXhYSOMP97XL6R1QSXxaWOpGNCDaUl ajorB0lJDcC0q3xAdwzRConxYVhlgmTrRiD8oLlSCD5baEAt5Zw17UTNDnDGmZQKR0fqLpWy 786Lm5OScb7DjEgcA2PRm17st4UQ1kF0rQHokVaotxRM74PPDB8bCsunlghJl1DRK9s1aSuN hL1Pv9VD8b4dFNvCo7b4hfAANPU67W40AaaGZ3UAfmw+1MYyo4QuAZGKzaP2ukbdCD/DYnqi tJy88XqWtyb4UQWKNoQqGKzlYXdKsldYqrLHGoMvj1UN9XcRtXHST/IaLn72o7j7/h/Ac5EL 8lSUVIG4TYn59NyxxAXa07Wi6zjVL1U11fTnFmE29ALYQEXKBI3KUO1A3p4sQWzU7uRmbuxn naUmm8RbpMcOfa9JjlXCLmQ5IP7Rr5tYZUCkZz08LIfF8UMXwH7OOEX87Y++EkAB+pzKZNNd hwoXulTAgjSy+OiaLtuCys9VdXLZ3Zy314azaCU3BoWgaMV0eAW/+gprWMXQM1lrlzvwlD/k whyy9wGf0AEPpLssLVt9VVxNjo6BIkt6d1pMg6mHsUEVzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmgXUF8FCRaWWyoACgkQG5NDfTtBYptO0w//dlXJs5/42hAXKsk+PDg3wyEFb4NpyA1v qmx7SfAzk9Hf6lWwU1O6AbqNMbh6PjEwadKUk1m04S7EjdQLsj/MBSgoQtCT3MDmWUUtHZd5 RYIPnPq3WVB47GtuO6/u375tsxhtf7vt95QSYJwCB+ZUgo4T+FV4hquZ4AsRkbgavtIzQisg Dgv76tnEv3YHV8Jn9mi/Bu0FURF+5kpdMfgo1sq6RXNQ//TVf8yFgRtTUdXxW/qHjlYURrm2 H4kutobVEIxiyu6m05q3e9eZB/TaMMNVORx+1kM3j7f0rwtEYUFzY1ygQfpcMDPl7pRYoJjB dSsm0ZuzDaCwaxg2t8hqQJBzJCezTOIkjHUsWAK+tEbU4Z4SnNpCyM3fBqsgYdJxjyC/tWVT AQ18NRLtPw7tK1rdcwCl0GFQHwSwk5pDpz1NH40e6lU+NcXSeiqkDDRkHlftKPV/dV+lQXiu jWt87ecuHlpL3uuQ0ZZNWqHgZoQLXoqC2ZV5KrtKWb/jyiFX/sxSrodALf0zf+tfHv0FZWT2 zHjUqd0t4njD/UOsuIMOQn4Ig0SdivYPfZukb5cdasKJukG1NOpbW7yRNivaCnfZz6dTawXw XRIV/KDsHQiyVxKvN73bThKhONkcX2LWuD928tAR6XMM2G5ovxLe09vuOzzfTWQDsm++9UKF a/A= In-Reply-To: <20250718120105.b42gyo7ywj42fcw4@skbuf> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 18/07/2025 14:01, Vladimir Oltean wrote: >> Maybe there is another property describing a time provider in the >> kernel or dtschema. Please look for it. This all looks like you are >> implementing typical use case in non-typical, but vendor-like, way. >> >> Best regards, >> Krzysztof > > An MII timestamper and a PTP clock (as integrated in a MAC or a PHY) are > similar but have some notable differences. > > A timestamper is an external device with a free-running counter, which > sniffs the MII bus between the MAC and the PHY, and provides timestamps > when the first octet of a packet hits the wire. > > A PTP clock is also a high precision counter, which can be free-running > or it can be precisely adjusted. It does not have packet timestamping > capabilities itself, instead the Ethernet MAC can snapshot this counter > when it places the first octet of a packet on the MII bus. PTP clocks > frequently have other auxiliary functions, like emitting external > signals based on the internal time, or snapshotting external signals. > > The timestamper is not required to have these functions. In fact, I am > looking at ptp_ines.c, the only non-PHY MII timestamper supported by the > kernel, and I am noting the fact that it does not call ptp_clock_register() > at all, presumably because it has no controllable PTP clock to speak of. > > That being said, my understanding is based on analyzing the public code > available to me, and I do not have practical experience with MII bus > snooping devices, so if Richard could chime in, it would be great. > > I am also in favor of using the "ptp-timer" phandle to describe the link And it is already used in other binding, so yes, that's the candidate. > between the MAC and the internal PTP clock that will be snapshot when > taking packet timestamps. The fman-dtsec.yaml schema also uses it for an > identical purpose. Best regards, Krzysztof