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: 12106695 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 4B273C433DB for ; Fri, 26 Feb 2021 14:05:28 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E99AD64EF6 for ; Fri, 26 Feb 2021 14:05:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E99AD64EF6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=esjJwCvH4mUHNMwJAtBctwiTML0XDz4pxaWihdaEo58=; b=itZm/177KFTyNlqWTjya9tz8W PWTvitEISNELAnAW+555uEVwBLHzqK13xpprC6qOBDmDTJL/4i2xSu2Z/CZCxlvi7U3IMxgnekITW 4anJUoW2KTPv5hlxIJYbMLUxLl13QA1ga9CzJXtX6eXD+n/cImJbB8jFMyFHLwFKkv4vmIKxqziWP /7jlAJ7NzdjdItAjrQ39TMC356KXuFX9+IR3+3QuumfktOkMyN4/ucKIQIjlU+b23iQinQln4UFuv Ob1WTzT/fcIwh46TKUg9NXF1v6tglEzpRKmAK+36wtipE7/QZS8ByYno+ywaoj0Ht3oxLaMRmD6Tj IL8njCGZg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lFdiZ-0003yj-NE; Fri, 26 Feb 2021 14:03:43 +0000 Received: from mx2.suse.de ([195.135.220.15]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1lFdiD-0003n6-FT for linux-arm-kernel@lists.infradead.org; Fri, 26 Feb 2021 14:03:24 +0000 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210226_090321_786843_C478B0DB X-CRM114-Status: GOOD ( 11.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: f.fainelli@gmail.com, arnd@arndb.de, narmstrong@baylibre.com, dwmw2@infradead.org, linux@armlinux.org.uk, hch@infradead.org, will@kernel.org, robh+dt@kernel.org, catalin.marinas@arm.com, robin.murphy@arm.com, ardb@kernel.org, Nicolas Saenz Julienne Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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; +};