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, 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 DFF58C43381 for ; Wed, 20 Feb 2019 07:53:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BA51921773 for ; Wed, 20 Feb 2019 07:53:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725851AbfBTHxE (ORCPT ); Wed, 20 Feb 2019 02:53:04 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:9116 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725765AbfBTHxE (ORCPT ); Wed, 20 Feb 2019 02:53:04 -0500 X-UUID: f9f5b346c75f47089706dd7b7a088b85-20190220 X-UUID: f9f5b346c75f47089706dd7b7a088b85-20190220 Received: from mtkmrs01.mediatek.inc [(172.21.131.159)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 115381564; Wed, 20 Feb 2019 15:52:57 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs01n2.mediatek.inc (172.21.101.79) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 20 Feb 2019 15:52:55 +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; Wed, 20 Feb 2019 15:52:55 +0800 From: Jerry-ch Chen To: , , , , CC: , , , , , , , , , , , , , , , Jerry-ch Chen Subject: [RFC PATCH V0 1/7] dt-bindings: mt8183: Add binding for FD shared memory Date: Wed, 20 Feb 2019 15:48:07 +0800 Message-ID: <1550648893-42050-2-git-send-email-Jerry-Ch.chen@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1550648893-42050-1-git-send-email-Jerry-Ch.chen@mediatek.com> References: <1550648893-42050-1-git-send-email-Jerry-Ch.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-SNTS-SMTP: B24336EFC8304D9506677991F1EEC8AAE9653F2A267B11C35774AFD84F2FDB182000:8 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 meta data between the co-processor and Face Detection (FD) unit of the camera system on Mediatek SoCs. Signed-off-by: Jerry-ch Chen --- .../mediatek,reserve-memory-fd_smem.txt | 44 ++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt new file mode 100644 index 0000000..52ae507 --- /dev/null +++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,reserve-memory-fd_smem.txt @@ -0,0 +1,44 @@ +Mediatek FD Shared Memory binding + +This binding describes the shared memory, which serves the purpose of +describing the shared memory region used to exchange data between Face +Detection hardware (FD) 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 Face Detection hardware (FD) 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-fd_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. + for Face Detection Unit, you need 1 MB at least. + + +Example: + +The following example shows the FD shared memory setup for MT8183. + + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + reserve-memory-fd_smem { + compatible = "mediatek,reserve-memory-fd_smem"; + size = <0 0x00100000>; + alignment = <0 0x1000>; + alloc-ranges = <0 0x40000000 0 0x100000000>; + }; + }; \ No newline at end of file -- 1.9.1