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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 32D1BCD3427 for ; Tue, 5 May 2026 14:15:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 94A3910E7E1; Tue, 5 May 2026 14:15:43 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="E6osNGJm"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id C4A7B10E7E1 for ; Tue, 5 May 2026 14:15:41 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id EB9CD60154; Tue, 5 May 2026 14:15:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 698A6C2BCB4; Tue, 5 May 2026 14:15:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777990540; bh=FQsBhAgsYHplHV2/vcCwYjBqbsq7KXkPO3MRqXSfMok=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=E6osNGJmPtrOn/dO5V7lDP7Lu/A7Jxq46ChObn5PlgAvC6B/uvqi6QdXgDtylkKuM fustiBuO44Cvy9/Z8gnQ76Exw7F/EXMUM4tSZWdpthwoUGaAcvKTxfr129TuZP6AEp acVDIdJWpmY9DvuBke1cI4BAhj6/Bo7OzY2Lo5qNrUeNE3QZsRE8RiO0sPN9cQVgoK UIC3P1lMZp8WkwsjfaA+BGMryIpLkoMJpkbBeeXm28BjehqGYWBVps0s8ISiwSZ3ti UIk9UYCpdU0ypAKcGcmQqzOppY78h0DnZSdZF+XEj94/78Kh78Mv6n5pO1dnuOpRqM Sg6yu/4lU10xg== Date: Tue, 5 May 2026 09:15:38 -0500 From: Rob Herring To: Marco Felsch Cc: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Krzysztof Kozlowski , Conor Dooley , Marek Vasut , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , laurentiu.palcu@oss.nxp.com, victor.liu@nxp.com, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 2/4] Revert "dt-bindings: display: bridge: ldb: Fill in reg property" Message-ID: <20260505141538.GA2547282-robh@kernel.org> References: <20260504-v7-1-topic-ldb-fixes-v1-0-0125d937ff7f@pengutronix.de> <20260504-v7-1-topic-ldb-fixes-v1-2-0125d937ff7f@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260504-v7-1-topic-ldb-fixes-v1-2-0125d937ff7f@pengutronix.de> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Mon, May 04, 2026 at 10:21:42PM +0200, Marco Felsch wrote: > This reverts commit 16c8d76abe83d75b578d72ee22d25a52c764e14a. > > Remove the 'reg' and 'reg-names' property from the LDB. > > The LDB is either part of the IOMUX_GPR (i.MX6SX) or the BLKCTRL > (i.MX8MP, i.MX93) register space. Both IOMUX_GPR and BLKCTRL are > register ranges with loose register definitions. E.g. > > - On the i.MX8MP there is one register which controls the AXI > threshold for two different IPs (BIT(31:16) - IP1, BIT(15:0) - IP2). > - On the i.MX6SX IOMUXC_GPR5 controlls: CSI2 mux, WDOG3 settings, PXP > handshake, ... > > In conclusion: it can't be ensured that one register belongs to one > dedicated IP and the LDB is rather an exception than the rule. It is fine if there's a child node for LDB if the LDB registers are consistent, but the other misc things are represented by the parent node. It is certainly not a requirement that either everything be in child nodes or nothing be in child nodes. What I don't see in this series is what problem does this fix? If you are going to break compatibility, then there had better be a good reason. Rob