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[2604:1380:45e3:2400::1]) by mx.google.com with ESMTPS id oo10-20020a17090b1c8a00b002971af6cd46si4828276pjb.133.2024.02.19.08.08.29 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Feb 2024 08:08:29 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-71640-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1; Authentication-Results: mx.google.com; arc=pass (i=1 spf=pass spfdomain=pengutronix.de); spf=pass (google.com: domain of linux-kernel+bounces-71640-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-71640-linux.lists.archive=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 31DF3284E7E for ; Mon, 19 Feb 2024 16:08:29 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E87493C46F; Mon, 19 Feb 2024 16:08:22 +0000 (UTC) Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (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 4C0413308A for ; Mon, 19 Feb 2024 16:08:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708358902; cv=none; b=V7CW1nse6ZVAw7/k3rXzlGYJHwKc++X2XxADmFKI+UinHFUc15QBZ4BsB5veGHZEOH/JjJQK7PqmDf7nOU+Ue0AMJ534Qnlm4UNHUuTT7zzfnehuIkWZj3h0a1nhEfod8snTbcTP0NLJ0zCpWs8GxVWZPKR/Lb+/wta3pg/pKSU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708358902; c=relaxed/simple; bh=5t4JB3wAVHCHNA7BJWB1aH8LGEeC36ChXJ5ADZLD5QE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=J3YwC86VvARSAcpJNX+YyYmHVRsE3zrcu2q3Oj1jndJXHAXO+o1Y/9GVOUzPl+M6mvXNrq9pwj52ruHm5EVqT48rgnZEI7kCf9K+962eiA7BiRSug/WTv9tpR3pVLOM+sdFUnrchPsIZSjkfOUs2QITa8ykyhZSdEX7uMV1FGcQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rc6BH-0001n7-M6; Mon, 19 Feb 2024 17:07:47 +0100 Received: from [2a0a:edc0:2:b01:1d::c5] (helo=pty.whiteo.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1rc6BD-001gUj-U5; Mon, 19 Feb 2024 17:07:43 +0100 Received: from ore by pty.whiteo.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1rc6BD-00FvZo-2d; Mon, 19 Feb 2024 17:07:43 +0100 Date: Mon, 19 Feb 2024 17:07:43 +0100 From: Oleksij Rempel To: =?utf-8?B?S8O2cnk=?= Maincent Cc: Andrew Lunn , Rob Herring , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Luis Chamberlain , Russ Weight , Greg Kroah-Hartman , "Rafael J. Wysocki" , Krzysztof Kozlowski , Conor Dooley , Mark Brown , Frank Rowand , Heiner Kallweit , Russell King , Thomas Petazzoni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, Dent Project Subject: Re: [PATCH net-next v3 14/17] dt-bindings: net: pse-pd: Add bindings for PD692x0 PSE controller Message-ID: References: <20240208-feature_poe-v3-0-531d2674469e@bootlin.com> <20240208-feature_poe-v3-14-531d2674469e@bootlin.com> <20240209145727.GA3702230-robh@kernel.org> <618be4b1-c52c-4b8f-8818-1e4150867cad@lunn.ch> <65099b67-b7dc-4d78-ba42-d550aae2c31e@lunn.ch> <20240219153106.19e83213@kmaincent-XPS-13-7390> 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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240219153106.19e83213@kmaincent-XPS-13-7390> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org On Mon, Feb 19, 2024 at 03:31:06PM +0100, Köry Maincent wrote: > On Fri, 16 Feb 2024 08:47:14 +0100 > Oleksij Rempel wrote: > > > > > > So, either somebody needs to understand 1000BaseT and can say the > > > proposed binding works, or we explicitly document the binding is > > > limited to 10BaseT and 100BaseT. > > > > I asked the internet and found the answer: Some PSE/PD implementations > > are not compatible with 1000BaseT. > > > > See Figure 33–4—10BASE-T/100BASE-TX Endpoint PSE location overview. > > Alternative B show a variant where power is injected directly to pairs > > without using magnetics as it is done for Alternative A (phantom > > delivery - over magnetics). > > > > So, we have following variants of 2 pairs PoE: > > +---------+---------------+-------------------+---------------------+--------------------+ > > | Variant | Alternative | Polarity | Power Feeding Type | > > Compatibility with | | | (a/b) | (Direct/Reverse) | > > (Direct/Phantom) | 1000BaseT | > > +=========+===============+===================+=====================+====================+ > > | 1 | a | Direct | Phantom | Yes > > | > > +---------+---------------+-------------------+---------------------+--------------------+ > > | 2 | a | Reverse | Phantom | Yes > > | > > +---------+---------------+-------------------+---------------------+--------------------+ > > | 3 | b | Direct | Phantom | Yes > > | > > +---------+---------------+-------------------+---------------------+--------------------+ > > | 4 | b | Reverse | Phantom | Yes > > | > > +---------+---------------+-------------------+---------------------+--------------------+ > > | 5 | b | Direct | Direct | No > > | > > +---------+---------------+-------------------+---------------------+--------------------+ > > | 6 | b | Reverse | Direct | No > > | > > +---------+---------------+-------------------+---------------------+--------------------+ > > Maybe we could remove the polarity column on this table as it does not bring > more information. It is also already explained on the PI pinout alternatives > table. Ack. I'm still not sure if "Phantom" is correct description. > > Also we should document that a 4pairs PSE supporting only 10/100BaseT (which > mean no magnetics on pinout AlternativeB) may not be compatible with a 4pairs > 1GBaseT PD. Ack. s/may not/is not/ :) and 4pairs PSE is not always compatible with PoE4 as well. I assume this kind of knowledge we will get from PSE driver. Regards, Oleksij -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |