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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 CE0E6C433DF for ; Mon, 8 Jun 2020 08:30:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A7D942072F for ; Mon, 8 Jun 2020 08:30:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="B+4fToX2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729119AbgFHIau (ORCPT ); Mon, 8 Jun 2020 04:30:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43260 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728951AbgFHIas (ORCPT ); Mon, 8 Jun 2020 04:30:48 -0400 Received: from mail-pj1-x1041.google.com (mail-pj1-x1041.google.com [IPv6:2607:f8b0:4864:20::1041]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED6F1C08C5C3; Mon, 8 Jun 2020 01:30:47 -0700 (PDT) Received: by mail-pj1-x1041.google.com with SMTP id a45so4753047pje.1; Mon, 08 Jun 2020 01:30:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=8feILcDA0tIlewM1KO106AZP1TsRZlV0wrLhrdTJ7fk=; b=B+4fToX21iv9QoVjppr44/lc3ZFWBQL5JO6a0275yptTgsD+TOR9A/boCycuYUAFMr s3DV8OTQT7upBbdc7HXwhLR5Saea1NCSTfOwGRbbDHejss7/uan7AnGazjgLMmJBZKtd H9uVZkwQ+qRvuc34NfGPopkwptiy6DJMlnfp/xcPWG3SZh/1+6H70UHL3CJhpeQU23hU PObJzAwBoqFTlWdZu8gwUOEVslw0Qy6zIFLfStKtCys1sJOhgVm8KSVcz1ClmdKGpCf6 WK+OGFNGbBvZuSnIKm/10x51jWms8hcCaxCsZvq9+Mk0vZjbVSskn57LFKSJWZDFzqSO BhrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=8feILcDA0tIlewM1KO106AZP1TsRZlV0wrLhrdTJ7fk=; b=aQ27mT3WkH28r0X67ML9jfVhOj0ftSk0YNIEoDLn8z/ChzNQ+HD3Lg2aETbpeeQhW4 PoOlt3tK+q+iymtW6NelxMnHnqiA2R7ZB84VGdqA7VNBg620KaOxZ2adWPXWHWTv1kqg Jm55PzIcVGiYi5rkvj57Klb+vge/GDvXRsjgGhCCdqzS6rcbR/p240RbH5t1dM9otq1+ PiejicQUgkDcpgHeNRs8l35orff6rwVzhsinlbTFVMMeV2Y1gtV2sssDil/i8NGJFQE+ pyWsePineE1gOiJ+QuxoHBExrwWPHpAzUnXwvZop+SAM7exgPmH5MKyi4OZUD+KAofpI zfxA== X-Gm-Message-State: AOAM5313cw4ibrfBimLOhwgstbAsZeSB8hQQyuL7fvNCGiNGarfUTHjd HHTi0WsGJFzasMMjaSe7mRyecMvPNiw= X-Google-Smtp-Source: ABdhPJyeHWrRZ7QzXxletY3kLJIxJWIs+gLBJ56sWRWJ2KQLKn7J5lIcB99++scBN53d1bkhC2luYg== X-Received: by 2002:a17:902:b601:: with SMTP id b1mr20489872pls.39.1591605047030; Mon, 08 Jun 2020 01:30:47 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([103.206.191.42]) by smtp.gmail.com with ESMTPSA id 27sm1210829pjg.19.2020.06.08.01.30.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Jun 2020 01:30:46 -0700 (PDT) From: dillon.minfei@gmail.com To: robh+dt@kernel.org, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux@armlinux.org.uk, vladimir.murzin@arm.com, kstewart@linuxfoundation.org, allison@lohutok.net, info@metux.net, tglx@linutronix.de Cc: devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dillon min Subject: [PATCH 1/2] ARM: dts: stm32: Setup 4M bytes reserved memory for mmap Date: Mon, 8 Jun 2020 16:30:37 +0800 Message-Id: <1591605038-8682-2-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1591605038-8682-1-git-send-email-dillon.minfei@gmail.com> References: <1591605038-8682-1-git-send-email-dillon.minfei@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: dillon min To mmap a framebuffer or v4l2 buffer from kernel to userspace on no-mmu platform, we need rely on 'arm_nommu_dma_ops' from arch/arm/mm/dma-mapping-nommu.c , so setup 4M bytes memory reserved for this purpose. Signed-off-by: dillon min --- arch/arm/boot/dts/stm32f469-disco.dts | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm/boot/dts/stm32f469-disco.dts b/arch/arm/boot/dts/stm32f469-disco.dts index 9397db0c43de..082b24ee81f7 100644 --- a/arch/arm/boot/dts/stm32f469-disco.dts +++ b/arch/arm/boot/dts/stm32f469-disco.dts @@ -65,6 +65,20 @@ reg = <0x00000000 0x1000000>; }; + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + linux,dma { + compatible = "shared-dma-pool"; + size = <0x400000>; + no-map; + linux,dma-default; + }; + + }; + aliases { serial0 = &usart3; }; -- 2.7.4