From patchwork Wed Apr 17 10:45:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frederic Chen X-Patchwork-Id: 10905201 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DECD613B5 for ; Wed, 17 Apr 2019 10:45:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C96AD28925 for ; Wed, 17 Apr 2019 10:45:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BCCDD28AD4; Wed, 17 Apr 2019 10:45:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1373828925 for ; Wed, 17 Apr 2019 10:45:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731728AbfDQKpf (ORCPT ); Wed, 17 Apr 2019 06:45:35 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:55200 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725792AbfDQKpe (ORCPT ); Wed, 17 Apr 2019 06:45:34 -0400 X-UUID: bddb3e8c15c34974a05937210f6c565e-20190417 X-UUID: bddb3e8c15c34974a05937210f6c565e-20190417 Received: from mtkcas07.mediatek.inc [(172.21.101.84)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1343567304; Wed, 17 Apr 2019 18:45:29 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs06n1.mediatek.inc (172.21.101.129) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 17 Apr 2019 18:45:28 +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; Wed, 17 Apr 2019 18:45:27 +0800 From: Frederic Chen To: , , , , CC: , , , , , , , , , , , , , , , , Subject: [RFC PATCH V1 1/6] dt-bindings: mt8183: Add binding for DIP shared memory Date: Wed, 17 Apr 2019 18:45:06 +0800 Message-ID: <20190417104511.21514-2-frederic.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190417104511.21514-1-frederic.chen@mediatek.com> References: <20190417104511.21514-1-frederic.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 000000000000..64c001b476b9 --- /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-dip_smem { + compatible = "mediatek,reserve-memory-dip_smem"; + size = <0 0x1400000>; + alignment = <0 0x1000>; + alloc-ranges = <0 0x40000000 0 0x50000000>; + }; + };