From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 5FBD5393DD4; Fri, 27 Feb 2026 10:26:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772187976; cv=none; b=iZLhp/099kZMgF1gu2TZRdvCHRoV7HIp21Vg+sjXMcoser9fZ13J42NkCi8VGcUIdpZtTGDPn/Kc1Mj1dj7ZWRGawP4hA6+7zNmqIw/GS5xTc893yWqGnSHv5vFa4dwczm4zdaiawPU8NhpMW+UknNhmVz1J6vbpjoq0L/mK2sA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772187976; c=relaxed/simple; bh=U6qsG3RCujy4VZbDK4gJJXjVt51fYC4GNNceCnOjb1M=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=XKVx5umfJwY3E2glRWCSbe32mISO1KsqGv+C23Vas6kLq9FQOXp4khTaPEvhu841a/xhkPw6EWP3C/U8sdrSU1Kx9zhzNSHHwkOl/9P/iULCdjIJxpAvf0sXD9oy0+HpVQzc3rUaa6otbptspyboZlEx+W5RIlky+OyeHvZ/juE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=gXtXppNQ; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="gXtXppNQ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=U6qsG3RCujy4VZbDK4gJJXjVt51fYC4GNNceCnOjb1M=; b=gXtXppNQJz4Sgw/rAH5I0a2NgA xuMdaYIB884cY7rWoBaGORqp4+FaeU51rCEHatNpaWjgkW0rTzb6TM0XYihONfCKlpWwV78K7kNU6 oVf59lpBPgePIRsem0A119YQvSvCBOmJvjf2KW9ct/5BbLQ7HQNfr/l/wuoPBfbcXIGOIh/sa4nQ5 ks4ZXvpA13KcjnZZzoXTKQ+ZW8hQaal8EkerdpmSNwjMn8qwLeaaBqXBBX8eb61WWUqlA+rCQvpv0 q/e5JG4q2ItdIVhvFoly+dXjWD/+DRyLWA7RRo1CZvW7828u3yK+RBk7U/h52F3HA6WE3fwae629l z499h0fg==; Received: from [172.31.31.148] (helo=u09cd745991455d.lumleys.internal) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vvv2i-0000000Cs0H-2VRb; Fri, 27 Feb 2026 10:25:57 +0000 Message-ID: Subject: Re: [RFC v2 0/2] ptp: Move non-NIC PHC drivers from netdev to clock/timekeeping maintainership From: David Woodhouse To: Wen Gu , tglx@kernel.org, tglx@linutronix.de, richardcochran@gmail.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, mani@kernel.org, imran.shaik@oss.qualcomm.com Cc: vladimir.oltean@nxp.com, wei.fang@nxp.com, xiaoning.wang@nxp.com, jonathan.lemon@gmail.com, vadim.fedorenko@linux.dev, yangbo.lu@nxp.com, svens@linux.ibm.com, nick.shi@broadcom.com, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, bcm-kernel-feedback-list@broadcom.com, linux-fpga@vger.kernel.org, imx@lists.linux.dev, linux-s390@vger.kernel.org, dust.li@linux.alibaba.com, xuanzhuo@linux.alibaba.com, taniya.das@oss.qualcomm.com Date: Fri, 27 Feb 2026 10:25:56 +0000 In-Reply-To: <20260227081934.96865-1-guwen@linux.alibaba.com> References: <20260227081934.96865-1-guwen@linux.alibaba.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-jelaBrtampaCjwXLPKWD" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-jelaBrtampaCjwXLPKWD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-02-27 at 16:19 +0800, Wen Gu wrote: >=20 > Patch 1 performs the refactor: move drivers and split Kconfig/Makefiles > accordingly, without intended functional changes. >=20 > Patch 2 updates MAINTAINERS to match the new layout and adds a dedicated = entry > for drivers/ptp/emulated/, moving review and ownership routing for this c= lass > of drivers away from the netdev maintainership. >=20 > No userspace ABI changes are intended, this is a refactor and maintenance > metadata update only. While no ABI changes are intended in *this* patch series, we do need some. These 'emulated' clocks mostly exist not to emulate IEEE1588 per se, but as a way to provide a precision real time clock to systems (especially virtual guests). We have already discussed the need to expose clock error bounds, and to expose paired timestamps against the actual hardware counter (TSC, arch counter, timebase, etc.). Another key difference is that we'll generally want to be able to derive UTC from these clocks, and feed them directly into the kernel's CLOCK_REALTIME. I don't have strong views on whether we extend the /dev/ptpX userspace ABI, or start to treat these 'emulated' clocks as a class of device in their own right and just shim them to /dev/ptpX for compatibility. > # Request for comments >=20 > 1. Following the clocksource/timekeeping and POSIX timer areas, this RFC = routes > changes for drivers/ptp/emulated/ to linux-kernel@vger.kernel.org=C2=A0(r= ather than > netdev). However, the preferred integration path is still unclear (e.g. w= hich > tree should take such changes, and who should collect/pull them for mergi= ng). We > would really appreciate guidance from the time/clock maintainers, especia= lly any > input from Thomas Gleixner, on the preferred tree/workflow for these chan= ges. >=20 > 2. This RFC currently lists us as the maintainers for drivers/ptp/emulate= d/ as a > fallback contact point. Ideally, we would prefer this area to be maintain= ed by > clock/time experts in the long run. Suggestions on more suitable maintain= ers are > very welcome. 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