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设备树之V4L2实例-嵌入式Linux-51CTO博客
source link: http://blog.51cto.com/jiangniu/2067453
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一概述V4L2(全称VideoForLinuxTwo)是Linux下的视频驱动框架，为Linux视频驱动和应用程序提供统一的编程规范。V4L2硬件系统包含两部分：SoC视频模块和外部DecoderSoC视频模块主要功能：采集并且处理视频信号，通过DMA引擎传输数据到DDR外部Decoder主要功能：转换视频信号，比如将HDMI信号转换为BT1120信号注意：外部Decoder通常挂载到主芯片I2C
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