From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 196D436F8FE; Tue, 12 May 2026 07:51:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.194.8.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778572288; cv=none; b=gGmBM+Ji3qw9OuN905bgAoF1ComPoscszt6UIuLoOcbk/CocFsHpfRzm9jOjE1NbzeCHi7wIM4QF6noyfKditSiOm7DOpSnCrIkxE0SjCjYhvEKqODtygsgSG2JnPvJB9sF4BoCDNlem+eS0UL84Qh9lHRA/5/LCslG1z2JUcPc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778572288; c=relaxed/simple; bh=QzOERDsu01teqRpJ/12Op6SVSFHMvsDpCuNgtRTgCpk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dmIY82kfGRA9Iizw7cweo6B4kYNHHzu4VuM+KjydvpTZPRwoD3k8OpWlg6aI60Y9u65Fvy64Ze1o844B2hejLYrUuQiXVA1Lnc8Gtlg4jC3ETqEzrqsDvkCiSgaq62kzEC04hNtcAAC4+Pzqpjy7iZKiPPxzjWdrH2+pgScQ9LA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it; spf=pass smtp.mailfrom=dolcini.it; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b=ukOLU+jn; arc=none smtp.client-ip=217.194.8.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b="ukOLU+jn" 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> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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> 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