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 ED17FC2BA4C for ; Wed, 26 Jan 2022 13:12:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=He+rkXY7Sx0uF8fHhjRVEJjSYUy7z8XaLTYgESXQEok=; b=LRRXAdnfaCppjy nGO67hHX8BvYh88SfFv9oOQlcqT3C8EmaZsK20GN6pZKpI1eB1rd3QEF0V9cn9gdGDXsG6AS9rwk1 iIp0bazAzG/VgpBfFi7AWVJzGe7iXZWsOilEy2esoe3nD73u6Nq/iaszZy8q/yYi9WZBflZUb1MOJ 2Z0yTJQl31sX0FdOXCzyGlNhaurnziymHXSB1IKZwtmeVGISFc/+6nE9kVCGtHDj+n6sDhSqlrX4E 42H+enkGf+RI/NbC8/g2t/ZhJe+tWATTF6f+RmtYuOFPZ8J6uV2gTz7ZoH+wZCv3jWFvUl5DGOpgy F8wiLDOrvQbLWRbewDDA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nCi4S-00Boxk-QX; Wed, 26 Jan 2022 13:10:44 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nCi4O-00BoxI-IU for linux-arm-kernel@lists.infradead.org; Wed, 26 Jan 2022 13:10:43 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0105460AE5; Wed, 26 Jan 2022 13:10:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B32FC340E3; Wed, 26 Jan 2022 13:10:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643202639; bh=rI93L2kVd8IapKE6VVjmyTQu2VCGF9EFEocZT1ypuDI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=q1/F3HYiBHfW5Bd2X4yc+EYeSp74NXjFRDjUsBDIjxrB384XUjW+I0FuuhQ1zEySh XvXlawbQFAGEmtqimydY0Bupu+nrJZlIfwa1xaC3G9NoCugkmXF743nS44y3g/TZ4D PLyC3DWSuey2Cc34+YcPC4L2otj6AXieYtP2G/Kxthb4ZkfFDC5wnPwCaVB9IsRON5 QebF00lbEa+GOIKZi8SrmfP4LHLtnw6wXa1nKQd1ZYjwgBi308AlILXs42jFlCUmkH jRKpTmP4QYHGIHRoqV9j+Q8GVlv2Xj06Gcw0hLSB/A+OY/XesBSfQA5Em74gWQuXzp WSVb4HiiLlt9Q== Date: Wed, 26 Jan 2022 21:10:34 +0800 From: Shawn Guo To: Lucas Stach Cc: Pengutronix Kernel Team , NXP Linux Team , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2] arm64: dts: imx8mq: disable DDRC node by default Message-ID: <20220126131033.GW4686@dragon> References: <20211218181808.235310-1-dev@lynxeye.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20211218181808.235310-1-dev@lynxeye.de> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220126_051040_678146_11182919 X-CRM114-Status: GOOD ( 14.46 ) 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: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Dec 18, 2021 at 07:18:08PM +0100, Lucas Stach wrote: > Without a OPP table or a downstream TF-A running on the system the DDRC w= ill > fail to probe, as it has no means to scale the DRAM frequency in that cas= e. > This however will block the bus scaling driver to come up and this in turn > prevents other devices that hook into the interconnect from probing. > = > If the DDRC is disabled, the interconnect driver will simply ignore it. As > most systems don't want to scale the DRAM frequency, disable the node by > default and only enable it on the systems that actually uses this > capability and provides a valid OPP table in the DT. > = > Signed-off-by: Lucas Stach > Reviewed-by: Fabio Estevam > Acked-by: Martin Kepplinger > Reviewed-by: Guido G=FCnther Applied, thanks! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel