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 9BCC4192B90; Sun, 3 Aug 2025 11:12:49 +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=1754219569; cv=none; b=VJUOBS8MWIL5Q0wz8nbM5nw3uj7STDYVtEZ03FH9hEYUxNOeL7Wc2d55D/+boJF5TaTBmqUeiCVPOsbK7eZ8y+4fioobY2u2Ckh9u8lL8s8x73fiYMdb6KT64Bgc4xapeVY7v8YqvyXg9QoXfkpE7bNrCSCH89J+wCy/LKshKV0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754219569; c=relaxed/simple; bh=/DuWb1PqPZaSu8+vdQF93J8DpOZRJnKyJD1SGitokQk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HBLvcyytjktXuxSvEmKGdyimU+Cr8VBiUvP/6sub9+8CREGCcpwQtlxkmU3+t/+R7B7dOetubHrS4U8/d+0XqqnXwUlUieRjr31jd6IFbNpBLhrB7PJFgAnYJM61tEP+jGNqFMU1lcl4w2d3JlDJLUaBPgILoaex+TFwJMIaSPY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bHuiIEhb; 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="bHuiIEhb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E459C4CEEB; Sun, 3 Aug 2025 11:12:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754219569; bh=/DuWb1PqPZaSu8+vdQF93J8DpOZRJnKyJD1SGitokQk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=bHuiIEhblA1gkXkFNEpp9tUT5E7hqrgJikoUwwNI38O7V03BCmkkme6O2SqRSNygM MWLbAUwRxhjhKIRIStlbMJEchhXdR7aMXNysFrf/42PXT2I0V4B/i0v8U++JnVe5kf JnaH67c/pa5pVZjUeVHQ/dDNSR8GG27yaGVOpoKOrwnoHZALCkjqaZRdf+VyZ845gk Ch1ui3i2o8jLy7ko8khFXmD7Ug3IM0rEWupS0/aTG/sV2KJLLgtQmGX2MaKed0rZF0 gnAxDFKWbslkPKo1dMualzXAkIczlqL5qrl5McRMBISAJ/oczoMZsXcv1TctdAmYNd 30E7j/4VJFDeQ== Message-ID: Date: Sun, 3 Aug 2025 13:12:44 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next 1/2] dt-bindings: dpll: Add clock ID property To: Ivan Vecera Cc: netdev@vger.kernel.org, Vadim Fedorenko , Arkadiusz Kubalewski , Jiri Pirko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Prathosh Satish , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Michal Schmidt , Petr Oros References: <20250717171100.2245998-1-ivecera@redhat.com> <20250717171100.2245998-2-ivecera@redhat.com> <5ff2bb3e-789e-4543-a951-e7f2c0cde80d@kernel.org> <6937b833-4f3b-46cc-84a6-d259c5dc842a@redhat.com> <20250721-lean-strong-sponge-7ab0be@kuoka> <804b4a5f-06bc-4943-8801-2582463c28ef@redhat.com> <9220f776-8c82-474b-93fc-ad6b84faf5cc@kernel.org> <466e293c-122f-4e11-97d2-6f2611a5178e@redhat.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 23/07/2025 09:23, Ivan Vecera wrote: > > > On 23. 07. 25 8:25 dop., Krzysztof Kozlowski wrote: >> On 21/07/2025 14:54, Ivan Vecera wrote: >>> On 21. 07. 25 11:23 dop., Krzysztof Kozlowski wrote: >>>> On Fri, Jul 18, 2025 at 02:16:41PM +0200, Ivan Vecera wrote: >>>>> Hi Krzysztof, >>>>> >>>>> ... >>>>> >>>>> The clock-id property name may have been poorly chosen. This ID is used by >>>>> the DPLL subsystem during the registration of a DPLL channel, along with its >>>>> channel ID. A driver that provides DPLL functionality can compute this >>>>> clock-id from any unique chip information, such as a serial number. >>>>> >>>>> Currently, other drivers that implement DPLL functionality are network >>>>> drivers, and they generate the clock-id from one of their MAC addresses by >>>>> extending it to an EUI-64. >>>>> >>>>> A standalone DPLL device, like the zl3073x, could use a unique property such >>>>> as its serial number, but the zl3073x does not have one. This patch-set is >>>>> motivated by the need to support such devices by allowing the DPLL device ID >>>>> to be passed via the Device Tree (DT), which is similar to how NICs without >>>>> an assigned MAC address are handled. >>>> >>>> You use words like "unique" and MAC, thus I fail to see how one fixed >>>> string for all boards matches this. MACs are unique. Property value set >>>> in DTS for all devices is not. >>>>> You also need to explain who assigns this value (MACs are assigned) or >>>> if no one, then why you cannot use random? I also do not see how this >>>> property solves this... One person would set it to value "1", other to >>>> "2" but third decide to reuse "1"? How do you solve it for all projects >>>> in the upstream? >>> >>> Some background: Any DPLL driver has to use a unique number during the >>> DPLL device/channel registration. The number must be unique for the >>> device across a clock domain (e.g., a single PTP network). >>> >>> NIC drivers that expose DPLL functionality usually use their MAC address >>> to generate such a unique ID. A standalone DPLL driver does not have >>> this option, as there are no NIC ports and therefore no MAC addresses. >>> Such a driver can use any other source for the ID (e.g., the chip's >>> serial number). Unfortunately, this is not the case for zl3073x-based >>> hardware, as its current firmware revisions do not expose information >>> that could be used to generate the clock ID (this may change in the >>> future). >>> >>> There is no authority that assigns clock ID value ranges similarly to >>> MAC addresses (OUIs, etc.), but as mentioned above, uniqueness is >>> required across a single PTP network so duplicates outside this >>> single network are not a problem. >> >> You did not address main concern. You will configure the same value for >> all boards, so how do you solve uniqueness within PTP network? > > This value differs across boards, similar to the local-mac-address. The > device tree specifies the entry, and the bootloader or system firmware > (like U-Boot) provides the actual value. This should be clearly explained in commit msg or pull request to dtschema. Where are patches for U-Boot? lore gives me 0 results. Best regards, Krzysztof