The purpose of this page is to describe the Xilinx Linux V4L2 pipeline driver.

Table of Contents

Overview

The Xilinx Linux V4L2 pipeline driver(xilinx-vipp.c) represents the whole pipeline with multiple sub-devices. In the V4L2 framework it is a bridge driver. The pipeline can be configured through the media node(/dev/media*), and the control operations such as stream on/off can be performed through the video node(/dev/video*). Both device nodes are created be the pipeline driver. The pipeline driver also includes the wrapper layer of the dmaengine API, in current implementation to the VDMA driver/IP, and this enabled to read/write frames from RAM.

The general description of V4L2 framework is documented here, v4l2-framework.txt.

Linux Kernel defconfig

CONFIG_VIDEO_XILINX should be enabled. The CONFIG_VIDEO_XILINX depends on CONFIG_VIDEO_V4L2, CONFIG_VIDEO_V4L2_SUBDEV_API, and CONFIG_OF.

Device tree binding

The dts node should be defined with correct configuration. The common dts properties are described in video.txt

axi_video_cap {
    compatible = "xlnx,axi-video";
    dmas = <&axi_vdma_1 1>, <&axi_vdma_3 1>;
    dma-names = "port0", "port1";
 
    ports {
        #address-cells = <1>;
        #size-cells = <0>;
 
        port@0 {
            reg = <0>;
            direction = "input";
            vcap0_in0: endpoint {
                remote-endpoint = <&scaler0_out>;
            };
        };
        port@1 {
            reg = <1>;
            direction = "input";
            vcap0_in1: endpoint {
                remote-endpoint = <&switch_out1>;
            };
        };
    };
};
 

Example Designs

• Zynq Base TRD

V4L2 Driver Sub-Pages

• Xilinx V4L2 DisplayPort 1.4 RX Subsystem Driver
• V4L-Utils & Libdrm Build Instructions
• Xilinx V4L2 CFA driver
• Xilinx V4L2 CRESAMPLE driver
• Xilinx V4L2 Demosaic driver
• Xilinx V4L2 Gamma Correction LUT driver
• Xilinx V4L2 MIPI CSI driver
• Xilinx V4L2 REMAPPER driver
• Xilinx V4L2 RGB2YUV driver
• Xilinx V4L2 Scaler driver
• Xilinx V4L2 SDI Rx driver
• Xilinx V4L2 Switch driver
• Xilinx V4L2 TPG driver
• Xilinx V4L2 VPSS CSC driver
• Xilinx V4L2 VPSS Scaler driver
• Xilinx V4L2 hdmirx driver

Related Links

• Linux Drivers