From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay5-d.mail.gandi.net (relay5-d.mail.gandi.net [217.70.183.197]) (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 800091F098D; Tue, 8 Apr 2025 15:14:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744125243; cv=none; b=YZpPgX34K1okvZ6EitRJ7B24uk99YVu8yINzvZuytcZO+ChYVh5rMhgEh+6RHgR/HH3zFRlXCB4aUvliqDE+t2nio0ATfLVOTek8AMXyZMOEcCHUCdbryj8LXnTgdfz/TWMeuAdvZi+g5UyYXI5der6p0L1yhzi6lR7t4h9i4Pc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744125243; c=relaxed/simple; bh=8p3t0lkqP6MY+gt6AiZADjhwdZ+1gjcjLL6bW89DHiY=; h=Mime-Version:Content-Type:Date:Message-Id:Subject:Cc:From:To: References:In-Reply-To; b=JmoiNPr4Gmv7j17tl6HFjKvWaGWm+xKn7q56N6qJe1qGYqKkAE3JLV6HI26sFzcj1zRjuDxyqDGvRygUMkL2CBi4ptxVGBWyIJN5VY7njz9RzxQiyCdU46m/b8yU8631AqdvRfTiOCM1NlpjJ7DJXDdIXdvbylZaC3GBkeKpjac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=e0UNBGod; arc=none smtp.client-ip=217.70.183.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="e0UNBGod" Received: by mail.gandi.net (Postfix) with ESMTPSA id 9081E44304; Tue, 8 Apr 2025 15:13:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1744125238; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ABDY6poh0HThAHrjisqjJxeh621Yt7h0FayEtDXs8a4=; b=e0UNBGodg2EZ86zi6OaGzuuF6bdNAYXjeXAwUVqzhoUgJk2DB2OMM6UbxH+GaL6AF+S6TE WkhDhb3vRWVzj8KS2Vo3uRT9UIX6UrANzHhaZRDIsbJjlyA9j5yw6aIO07XYDvRx3OD9Or ++LdKi+50MW2olNWpkpYdKOgu5xHjzLp7FoMmdqO6uRWLkJtd4DE88vXIZKS8nFNgH1eo3 cow28PW5jz2i+yrtMIr3ZuGX1iHJFoPmPLgeNBgvsMGdsnS53/bJEG5ob1SoFUe4v5Jplj pwubq7Ej8hXCwX4zDyec0KJ0k9PEgTFo7RNt8rel/Ra1V7jxu6MZmM4zscARAg== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 08 Apr 2025 17:13:54 +0200 Message-Id: Subject: Re: [PATCH 15/16] misc: lan966x_pci: Add dtso nodes in order to support SFPs Cc: "Greg Kroah-Hartman" , "Rafael J. Wysocki" , "Danilo Krummrich" , "Shawn Guo" , "Sascha Hauer" , "Pengutronix Kernel Team" , "Fabio Estevam" , "Michael Turquette" , "Stephen Boyd" , "Andi Shyti" , "Wolfram Sang" , "Peter Rosin" , "Derek Kiernan" , "Dragan Cvetic" , "Arnd Bergmann" , "Rob Herring" , "Saravana Kannan" , "Bjorn Helgaas" , "Mark Brown" , "Len Brown" , "Andy Shevchenko" , "Daniel Scally" , "Heikki Krogerus" , "Sakari Ailus" , "Wolfram Sang" , "Geert Uytterhoeven" , , , , , , , , , , "Allan Nielsen" , "Horatiu Vultur" , "Steen Hegelund" , "Luca Ceresoli" , "Thomas Petazzoni" From: "Thomas Petazzoni" To: "Herve Codina" , "Andrew Lunn" X-Mailer: aerc References: <20250407145546.270683-1-herve.codina@bootlin.com> <20250407145546.270683-16-herve.codina@bootlin.com> <19f1a382-1b6b-42bd-a548-a1a5644c9a1b@lunn.ch> <20250408162603.02d6c3a1@bootlin.com> In-Reply-To: <20250408162603.02d6c3a1@bootlin.com> X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvtdefgedvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpegggfgtfffkufevhffvofhfjgesthhqredtredtjeenucfhrhhomhepfdfvhhhomhgrshcurfgvthgriiiiohhnihdfuceothhhohhmrghsrdhpvghtrgiiiihonhhisegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpefhgfeijeduheejtdduteffleeggeejieffiedvteefjeefudekvdeggfeihfeivdenucffohhmrghinheplhhptgdrvghvvghnthhspdgsohhothhlihhnrdgtohhmnecukfhppeeltddrkeelrdduieefrdduvdejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepledtrdekledrudeifedruddvjedphhgvlhhopehlohgtrghlhhhoshhtpdhmrghilhhfrhhomhepthhhohhmrghsrdhpvghtrgiiiihonhhisegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopeegvddprhgtphhtthhopehhvghrvhgvrdgtohguihhnrgessghoohhtlhhinhdrtghomhdprhgtphhtthhopegrnhgurhgvfieslhhunhhnrdgthhdprhgtphhtthhopehgrhgvghhkhheslhhinhhugihfohhunhgurghtihhonhdrohhrghdprhgtphhtthhopehrrghfrggvlheskhgvrhhnv ghlrdhorhhgpdhrtghpthhtohepuggrkhhrsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehshhgrfihnghhuoheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepshdrhhgruhgvrhesphgvnhhguhhtrhhonhhigidruggvpdhrtghpthhtohepkhgvrhhnvghlsehpvghnghhuthhrohhnihigrdguvg X-GND-Sasl: thomas.petazzoni@bootlin.com Andrew, Herv=C3=A9, On Tue Apr 8, 2025 at 4:26 PM CEST, Herve Codina wrote: >> What exactly does this DTSO file represent? > > The dsto represents de board connected to the PCI slot and identified > by its PCI vendor/device IDs. If I may extend on that by providing what I believe is a more accurate/precise definition. The DTSO doesn't represent the board, rather it describes the HW topology of the devices inside the PCI endpoint. Indeed, the PCI endpoint is a full-blown SoC with lots of different HW blocks that already have drivers in the kernel (because the same chip can be used with Linux running on an ARM core embedded in the SoC, rather than access as a PCI endpoint). So the DTSO describes the full topology of the HW blocks inside this complex PCI endpoint, just like the DTS describes the full topology of the HW blocks inside an SoC. Please see: https://lpc.events/event/17/contributions/1421/attachments/1337/2680/LPC2= 023%20Non-discoverable%20devices%20in%20PCI.pdf And most notably slide 6. Best regards, Thomas --=20 Thomas Petazzoni, co-owner and CEO, Bootlin Embedded Linux and Kernel engineering and training https://bootlin.com