From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from vps0.lunn.ch (vps0.lunn.ch [156.67.10.101]) (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 8016C1A9F90; Mon, 11 May 2026 22:15:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=156.67.10.101 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778537719; cv=none; b=q1JhNj+JBQpv2smhot92McgcMlUppy8ORIfUWxWHy8ouBYytpemXB3X+cAWaC7rxkz1V48KZSlztmMmftyamQ9dyn5Ba9mRBXr9b7lUi3Pg2yQJ5BzejuxMqw8pKWBFLrl9lyR/LUf37R39aHhHs/RQdm2FjA/Qx1MD8U5USbos= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778537719; c=relaxed/simple; bh=Q8w/gOkAYVfjp81UWcW/dNmRxEyS60yysoGbGftMQqk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Dk9uXCHs986noFhheU8jjwRGUxJdqHHcP7hvm72cZGpI9qnNnjHs37CLSTyKmX4GTfr8TxFFvWHlla6xFYIkRz8hKqwyRb9Pkc4F7lSOsK9n6Rm8BafaqimvK2L+tFC9bieuJTHQwTF8FL2dntnvlER29r7Iv5CpWEVR+vNh9Rg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch; spf=pass smtp.mailfrom=lunn.ch; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b=3iDx1+ce; arc=none smtp.client-ip=156.67.10.101 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lunn.ch Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="3iDx1+ce" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Disposition:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:From:Sender:Reply-To:Subject: Date:Message-ID:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Content-Disposition:In-Reply-To:References; bh=3/K23XI4d03lV4vnZkh8tawAwrfuf0tk1XEGUfCzDW8=; b=3iDx1+cetgyRHHX1j3M5Xl67V2 D7+f0e+EGFFrRC28M3lwLXGYlsYI5g1ImOsiUkx/mbw9mfAAn8RnnupBcrZO4lwrjtD9HvtxRzrKM XzaEtzA6bwXl/YVQlfaziean51GiGjwIUB1GVmfUMQMnHULBbjnMOExVWI9BkD442DCg=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1wMYu4-002Rhj-KG; Tue, 12 May 2026 00:15:08 +0200 Date: Tue, 12 May 2026 00:15:08 +0200 From: Andrew Lunn 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: 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>. Did you read 22.6? I've not seen a mechanical interface as defined in 22.6 for at least 20 years, maybe 30 years. That cause does not apply in this context. > - ethphy: ethernet-phy { > + ethphy: ethernet-phy@0 { > compatible = "ethernet-phy-ieee802.3-c22"; > + reg = <0>; This could very well break this board. Without a reg value, the core will find the first PHY on the bus, at whatever address it is at. If you hard code 0, the PHY must be at 0, otherwise it will not be found. Andrew