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Diffstat (limited to 'Documentation/devicetree/bindings/media/xilinx/xlnx,v-scd.txt')
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diff --git a/Documentation/devicetree/bindings/media/xilinx/xlnx,v-scd.txt b/Documentation/devicetree/bindings/media/xilinx/xlnx,v-scd.txt new file mode 100644 index 000000000000..a05e9712c833 --- /dev/null +++ b/Documentation/devicetree/bindings/media/xilinx/xlnx,v-scd.txt @@ -0,0 +1,164 @@ +Xilinx Scene Change Detection IP (SCD) +-------------------------------------- + +The Xilinx Scene Change Detection IP contains two blocks: one IP block is used +for reading video frame data from memory to the device and the other IP block +is used for determining whether there is a scene change between current and the +previous frame. The IP supports YUV planar and semi-planar formats. IP only +needs luma frame to determine the scene change event. The IP supports memory +based model, which means that it will accept a dma buffer address and perform +MEM2DEV transfer followed by statistical based image processing and give the +data back to application if scene change detection is present or not. + +Another version of scene change detection IP which supports streaming model, +which means that IP can be inserted in a capture pipeline. For example, +"hdmirx -> streaming-scd -> fb_wr" is a typical capture pipeline where +streaming SCD can be embedded. The IP accespts the AXI video data and perform +histogram based statistical analysis to detect scene change. The IP supports +single channel. + +Required properties: + +- compatible: Should be "xlnx,v-scd" + +- reg: Physical base address and length of the registers set for the device + +- clocks: Reference to the video core clock. + +- reset-gpios: Specifier for a GPIO that assert SCD (AP_RST_N) reset. + +- xlnx,memory-based: This is to differentiate between memory based and + streaming based IP. The value is 1 for memory based and 0 for streaming + based IPs. + +- xlnx,numstreams: Maximum active streams IP can support is 8 and this is based + on the design. + +- xlnx,addrwidth: Size of dma address pointer in IP (either 32 or 64) + +- subdev: Each channel will have its own subdev node. Each subdev will have its + sink port. + +- port: Video port, using the DT bindings defined in ../video-interfaces.txt. + +Example: + +1. Memory based device tree + +The following example shows how the device tree would look like for a memory +based design where 8 streams are enabled. + + scd: scenechange@a0100000 { + compatible = "xlnx,v-scd"; + reg = <0x0 0xa0100000 0x0 0x1fff>; + clocks = <&misc_clk_0>; + interrupt-parent = <&gic>; + interrupts = <0 90 4>; + reset-gpios = <&gpio 94 1>; + + xlnx,memory-based; + xlnx,numstreams = <8>; + xlnx,addrwidth = <0x20>; + + #address-cells = <1>; + #size-cells = <0>; + #dma-cells = <1>; + + subdev@0 { + port@0 { + reg = <0>; + scd_in0: endpoint { + remote-endpoint = <&vcap0_out0>; + }; + }; + }; + subdev@1 { + port@0 { + reg = <0>; + scd_in1: endpoint { + remote-endpoint = <&vcap0_out1>; + }; + }; + }; + subdev@2 { + port@0 { + reg = <0>; + scd_in2: endpoint { + remote-endpoint = <&vcap0_out2>; + }; + }; + }; + subdev@3 { + port@0 { + reg = <0>; + scd_in3: endpoint { + remote-endpoint = <&vcap0_out3>; + }; + }; + }; + subdev@4 { + port@0 { + reg = <0>; + scd_in4: endpoint { + remote-endpoint = <&vcap0_out4>; + }; + }; + }; + subdev@5 { + port@0 { + reg = <0>; + scd_in5: endpoint { + remote-endpoint = <&vcap0_out5>; + }; + }; + }; + subdev@6 { + port@0 { + reg = <0>; + scd_in6: endpoint { + remote-endpoint = <&vcap0_out6>; + }; + }; + }; + subdev@7 { + port@0 { + reg = <0>; + scd_in7: endpoint { + remote-endpoint = <&vcap0_out7>; + }; + }; + }; + }; + +2. Streaming based device tree + +The following example shows how the device tree would look like for a streaming +based design. + + scd: scenechange@a0280000 { + compatible = "xlnx,v-scd"; + reg = <0x0 0xa0280000 0x0 0x1fff>; + clocks = <&clk 72>; + interrupt-parent = <&gic>; + interrupts = <0 111 4>; + reset-gpios = <&gpio 100 1>; + #address-cells = <1>; + #size-cells = <0>; + xlnx,numstreams = <1>; + + scd { + port@0 { + reg = <0x0>; + scd_in0: endpoint { + remote-endpoint = <&vpss_scaler_out>; + }; + }; + + port@1 { + reg = <0x1>; + scd_out0: endpoint { + remote-endpoint = <&vcap_hdmi_in_1>; + }; + }; + }; + }; |