From patchwork Fri Feb 26 14:02:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 387819 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A94AC433DB for ; Fri, 26 Feb 2021 14:04:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CBE1464F13 for ; Fri, 26 Feb 2021 14:04:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229554AbhBZOEG (ORCPT ); Fri, 26 Feb 2021 09:04:06 -0500 Received: from mx2.suse.de ([195.135.220.15]:53446 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229989AbhBZOD7 (ORCPT ); Fri, 26 Feb 2021 09:03:59 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 6F9FEB040; Fri, 26 Feb 2021 14:03:16 +0000 (UTC) From: Nicolas Saenz Julienne To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: f.fainelli@gmail.com, robh+dt@kernel.org, robin.murphy@arm.com, ardb@kernel.org, hch@infradead.org, narmstrong@baylibre.com, dwmw2@infradead.org, linux@armlinux.org.uk, catalin.marinas@arm.com, arnd@arndb.de, will@kernel.org, Nicolas Saenz Julienne Subject: [RFC 01/13] dt-bindings: Introduce 64bit-mmio-broken Date: Fri, 26 Feb 2021 15:02:53 +0100 Message-Id: <20210226140305.26356-2-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210226140305.26356-1-nsaenzjulienne@suse.de> References: <20210226140305.26356-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some buses might not be able to handle 64-bit sized MMIO accesses, on otherwise 64-bit systems. Introduce a boolean property to cater for this limitation. Signed-off-by: Nicolas Saenz Julienne --- .../devicetree/bindings/common-properties.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/common-properties.txt b/Documentation/devicetree/bindings/common-properties.txt index 98a28130e100..3783510102c3 100644 --- a/Documentation/devicetree/bindings/common-properties.txt +++ b/Documentation/devicetree/bindings/common-properties.txt @@ -83,3 +83,18 @@ gpio@0 { #gpio-cells = <2>; #daisy-chained-devices = <3>; }; + +Broken 64-bit buses +------------------- + +Some buses might not be able to handle 64-bit sized MMIO accesses, on otherwise +64-bit systems. This property is only relevant to MMIO bus nodes. + +Optional properties: + - 64bit-mmio-broken: Boolean + +Example: +pcie@0 { + compatible = "name"; + 64bit-mmio-broken; +};