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=-8.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, 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 9FBCBC04AB1 for ; Fri, 10 May 2019 02:01:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 79448217F4 for ; Fri, 10 May 2019 02:01:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726862AbfEJCBz (ORCPT ); Thu, 9 May 2019 22:01:55 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:56065 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726799AbfEJCBz (ORCPT ); Thu, 9 May 2019 22:01:55 -0400 X-UUID: b9d62f3c0b6d4c259b49b2e7b56d8fda-20190510 X-UUID: b9d62f3c0b6d4c259b49b2e7b56d8fda-20190510 Received: from mtkmrs01.mediatek.inc [(172.21.131.159)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 2095654483; Fri, 10 May 2019 10:01:49 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs03n1.mediatek.inc (172.21.101.181) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 10 May 2019 10:01:48 +0800 Received: from mtkslt306.mediatek.inc (10.21.14.136) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 10 May 2019 10:01:48 +0800 From: Jungo Lin To: , , , , CC: , , , , , , , , , , , , , , , , , , Jungo Lin Subject: [RFC,V2,01/11] dt-bindings: mt8183: Add binding for ISP Pass 1 reserved memory Date: Fri, 10 May 2019 09:57:47 +0800 Message-ID: <20190510015755.51495-2-jungo.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: References: Reply-To: Jungo Lin 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 reserved shared memory used to exchange ISP configuration and tuning data between the co-processor and Pass 1 (P1) unit of the camera ISP system on Mediatek SoCs. Signed-off-by: Jungo Lin --- .../mediatek,reserve-memory-cam-smem.txt | 42 +++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-cam-smem.txt diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-cam-smem.txt b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-cam-smem.txt new file mode 100644 index 000000000000..65a967cff91e --- /dev/null +++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-cam-smem.txt @@ -0,0 +1,42 @@ +Mediatek ISP Pass 1 Shared Memory binding + +This binding describes the shared memory, which serves the purpose of +describing the shared memory region used to exchange data between Pass 1 +unit of Image Signal Processor (ISP) and the 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 Pass 1 unit of ISP can access memory through the iommu so it +uses the dma address to access the memory region. +(See iommu/mediatek,iommu.txt for the detailed description of Mediatek IOMMU) + +For additional details about reserved memory regions see reserved-memory.txt + +Required properties: + +- compatible: must be "mediatek,reserve-memory-cam-smem" + +- size: required for dynamic allocation. The unit is bytes. + +- alloc-range: required for dynamic allocation. The range must + between 0x40000000 and 0x100000000 due to the co-processer's + addressing limitation. + +Example: + +The following example shows the ISP Pass 1 shared memory setup for MT8183. + + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + cam_mem_reserved: cam_mem_region { + compatible = "mediatek,reserve-memory-cam-smem"; + size = <0 0x1400000>; + no-map; + alignment = <0 0x1000>; + alloc-ranges = <0 0x40000000 0 0x10000000>; + }; + }; -- 2.18.0