From mboxrd@z Thu Jan 1 00:00:00 1970 From: 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> References: <1550648893-42050-1-git-send-email-Jerry-Ch.chen@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1550648893-42050-1-git-send-email-Jerry-Ch.chen@mediatek.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: hans.verkuil@cisco.com, laurent.pinchart+renesas@ideasonboard.com, tfiga@chromium.org, matthias.bgg@gmail.com, mchehab@kernel.org Cc: devicetree@vger.kernel.org, Sean.Cheng@mediatek.com, Rynn.Wu@mediatek.com, srv_heupstream@mediatek.com, holmes.chiou@mediatek.com, Jerry-ch Chen , jungo.lin@mediatek.com, sj.huang@mediatek.com, yuzhao@chromium.org, linux-mediatek@lists.infradead.org, zwisler@chromium.org, christie.yu@mediatek.com, frederic.chen@mediatek.com, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org List-Id: devicetree@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