rk3566 9个video 设备是如何产生的

yjr1220

如题，谢谢！

zyk

一般是内核注册

1. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video0 -> ../../devices/platform/rkisp-vir0/video4linux/video0
   
2. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video1 -> ../../devices/platform/rkisp-vir0/video4linux/video1
   
3. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video2 -> ../../devices/platform/rkisp-vir0/video4linux/video2
   
4. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video3 -> ../../devices/platform/rkisp-vir0/video4linux/video3
   
5. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video4 -> ../../devices/platform/rkisp-vir0/video4linux/video4
   
6. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video5 -> ../../devices/platform/rkisp-vir0/video4linux/video5
   
7. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video6 -> ../../devices/platform/rkisp-vir0/video4linux/video6
   
8. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video7 -> ../../devices/platform/rkisp-vir0/video4linux/video7
   
9. lrwxrwxrwx 1 root root 0 2021-12-16 09:17 /sys/class/video4linux/video8 -> ../../devices/platform/rkisp-vir0/video4linux/video8
   

复制代码

，上层去创建/dev下的节点，感兴趣可以在v4l2_device_register相关注册函数打印信息去跟踪一下

Liuth

设备树里面rkisp节点开启之后，v4l2框架驱动就会去注册video设备

yjr1220

谢谢！ 请问 两位大神 , 它这几个video设备的作用是什么呢？ 谢谢！！

zyk

可以了解一下v4l2的框架，感兴趣可以跟一下驱动