From mboxrd@z Thu Jan 1 00:00:00 1970 From: 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> References: Reply-To: Jungo Lin Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: 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: tfiga@chromium.org, hans.verkuil@cisco.com, laurent.pinchart+renesas@ideasonboard.com, matthias.bgg@gmail.com, mchehab@kernel.org Cc: shik@chromium.org, devicetree@vger.kernel.org, Sean.Cheng@mediatek.com, suleiman@chromium.org, Rynn.Wu@mediatek.com, srv_heupstream@mediatek.com, ryan.yu@mediatek.com, Jerry-ch.Chen@mediatek.com, frankie.chiu@mediatek.com, Jungo Lin , sj.huang@mediatek.com, yuzhao@chromium.org, linux-mediatek@lists.infradead.org, seraph.huang@mediatek.com, zwisler@chromium.org, christie.yu@mediatek.com, frederic.chen@mediatek.com, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org List-Id: linux-mediatek@lists.infradead.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