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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, 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 505F1C282D8 for ; Fri, 1 Feb 2019 11:22:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2422421908 for ; Fri, 1 Feb 2019 11:22:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728588AbfBALWF (ORCPT ); Fri, 1 Feb 2019 06:22:05 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:19866 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727178AbfBALWF (ORCPT ); Fri, 1 Feb 2019 06:22:05 -0500 X-UUID: 5924be4e22e24a57a2fc62e7309230c3-20190201 X-UUID: 5924be4e22e24a57a2fc62e7309230c3-20190201 Received: from mtkcas06.mediatek.inc [(172.21.101.30)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1681281333; Fri, 01 Feb 2019 19:21:59 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 1 Feb 2019 19:21:58 +0800 Received: from mtkslt306.mediatek.inc (10.21.14.136) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 1 Feb 2019 19:21:58 +0800 From: Frederic Chen To: , , , , CC: , , , , , , , , , , , Subject: [RFC PATCH V0 1/7] [media] dt-bindings: mt8183: Add binding for DIP shared memory Date: Fri, 1 Feb 2019 19:21:25 +0800 Message-ID: <1549020091-42064-2-git-send-email-frederic.chen@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1549020091-42064-1-git-send-email-frederic.chen@mediatek.com> References: <1549020091-42064-1-git-send-email-frederic.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch adds the binding for describing the shared memory used to exchange configuration and tuning data between the co-processor and Digital Image Processing (DIP) unit of the camera ISP system on Mediatek SoCs. Signed-off-by: Frederic Chen --- .../mediatek,reserve-memory-dip_smem.txt | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt new file mode 100644 index 0000000..0ded478 --- /dev/null +++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-dip_smem.txt @@ -0,0 +1,45 @@ +Mediatek DIP Shared Memory binding + +This binding describes the shared memory, which serves the purpose of +describing the shared memory region used to exchange data between Digital +Image Processing (DIP) and co-processor in Mediatek SoCs. + +The co-processor doesn't have the iommu so we need to use the physical +address to access the shared buffer in the firmware. + +The Digital Image Processing (DIP) can access memory through mt8183 IOMMU so +it can use dma address to access the memory region. +(See iommu/mediatek,iommu.txt for the detailed description of Mediatek IOMMU) + + +Required properties: + +- compatible: must be "mediatek,reserve-memory-dip_smem" + +- reg: required for static allocation (see reserved-memory.txt for + the detailed usage) + +- alloc-range: required for dynamic allocation. The range must + between 0x00000400 and 0x100000000 due to the co-processer's + addressing limitation + +- size: required for dynamic allocation. The unit is bytes. + If you want to enable the full feature of Digital Processing Unit, + you need 20 MB at least. + + +Example: + +The following example shows the DIP shared memory setup for MT8183. + + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + reserve-memory-isp_smem { + compatible = "mediatek,reserve-memory-dip_smem"; + size = <0 0x1400000>; + alignment = <0 0x1000>; + alloc-ranges = <0 0x40000000 0 0x50000000>; + }; + }; -- 1.9.1