From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 263D8CD4F26 for ; Tue, 12 May 2026 07:51:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UMQBXrU9FT0dD0+vFXxYp0huKRYdo7AaaqC5mS/KqME=; b=zQRZeqfgzWssIq5iLO0tBCOZFs DgX7re2DDsMLU5FCVP2lCp9Wyxh9gkPcZdhDL4JkIs7iaBe6C+QbmV82BYjApIic/FX4jjxJmD4ey BiBFDYdv9iDEFJ5+FygY0qziz5FeVMfKPQQ1ewQl8Fb6bo2kN9wOV0lA6NPOD4VV396g2bKM++JAS 1pk+ftdFUGzHnLnYB+sWV96iJNtKEk2RZj5lX52hTvnGorlnGik0v04K3haRqtQLH4rpLHesKwEwN hBrK4VF14XbtUg4OcsqFip0BCI9pGGieDaamCltW0ZF3WnVXtotxvHX6mSlseghjp/appQM8kIAQj JbeI77gg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMhtr-0000000FzNo-41U2; Tue, 12 May 2026 07:51:31 +0000 Received: from mail11.truemail.it ([2001:4b7e:0:8::81]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMhtn-0000000FzMb-3crR for linux-arm-kernel@lists.infradead.org; Tue, 12 May 2026 07:51:30 +0000 Received: from francesco-nb (93-49-2-63.ip317.fastwebnet.it [93.49.2.63]) by mail11.truemail.it (Postfix) with ESMTPA id 5B3A11F92A; Tue, 12 May 2026 09:51:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1778572282; bh=UMQBXrU9FT0dD0+vFXxYp0huKRYdo7AaaqC5mS/KqME=; h=From:To:Subject; b=ukOLU+jnyf7tyziG+vS3l59YEiSDEnBB6kbfjmmR5Eoqhn5yE+U9LSKtp347Wv2ta yMeANjw/xMVlYN5GTOyZyGlokPO5HopM7zXZJl98uAw4JyQq7IyrrzBmseeauDoUoq YB5F/1sCQat7R27vo1y3SLaZs0NVfLCSNKtIUCIdpJxoczRC1OkFbMRAiQV0UlnYcO iLV4reulN618GIUUifmQPvFf0wh4ZsqWkynriFRN1qoKLW0qHqLLZwDhbmcfdQoKn1 O4yZfIHSx2REDx6U2KaZu4otYWbBXSIhqV9BtDCbmn9fkPx29jNlNy7ju40L6bWqbH uPYPsr6QDjB3A== Date: Tue, 12 May 2026 09:51:20 +0200 From: Francesco Dolcini To: Frank Li Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/4] ARM: dts: imx6qdl-sabrelite: add mdio phy address 0 Message-ID: <20260512075120.GB5820@francesco-nb> References: <20260511-b4-imx25_dts_simple_warning-v1-0-01b855a5ce25@nxp.com> <20260511-b4-imx25_dts_simple_warning-v1-1-01b855a5ce25@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260511-b4-imx25_dts_simple_warning-v1-1-01b855a5ce25@nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260512_005128_924322_5E8955BD X-CRM114-Status: UNSURE ( 8.23 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, May 11, 2026 at 05:04:56PM -0400, Frank Li wrote: > According to IEEE 802.3 Clause 22.2.4.5.5 PHYAD (PHY Address), A PHY that > is connected to the station management entity via the mechanical interface > defined in 22.6 shall always respond to transactions addressed to PHY > Address zero <00000>. > > Use address 0 is safe because only one MDIO phy under mdio bus. I do not think this is generally safe. Not all ethernet phy answer to the 0 broadcast address. The one that I have personally worked with consider 0 a unicast address. Francesco