Insmod driver,no /dev/video

Autonomous Machines Jetson & Embedded Systems Jetson Orin Nano
1

Hello, I am adding drivers for the AHD to CSI video decoding chip (rn6752). I am modifying it based on the imx477 device tree content in the source code. After insmod rn6752.ko, I cannot find/dev/video *. Please help me check where the problem is.

$dmesg|grep rn6752

[   77.827898] nv_rn6752: module verification failed: signature and/or required key missing - tainting kernel
[   77.838302] rn6752 9-002c: probing v4l2 sensor.
[   77.838419] rn6752 9-002c: tegracam sensor driver:rn6752_v2.0.6
[   77.838656] rn6752 10-002c: probing v4l2 sensor.
[   77.838731] rn6752 10-002c: tegracam sensor driver:rn6752_v2.0.6

Compared to cameras that can generate/dev/video0, dmesg lacks: tegra-camrtc-capture-vi tegra-capture-vi: subdev xxx bound

$ media-ctl -p
Media controller API version 5.10.120

Media device information
------------------------
driver          tegra-camrtc-ca
model           NVIDIA Tegra Video Input Device
serial          
bus info        
hw revision     0x3
driver version  5.10.120

Device topology
- entity 1: 13e40000.host1x:nvcsi@15a00000- (2 pads, 0 link)
            type V4L2 subdev subtype Unknown flags 0
	pad0: Sink
	pad1: Source

- entity 4: 13e40000.host1x:nvcsi@15a00000- (2 pads, 0 link)
            type V4L2 subdev subtype Unknown flags 0
	pad0: Sink
	pad1: Source

tegra234-camera-rbpcv3-imx477.txt (11.3 KB)
nv_imx219.txt (19.3 KB)

3

Could be the same with below topic.

5

Thank you for your reply.
I followed your instructions and the error on the first line disappeared, but I still cannot get/dev/video0

6

You may need to dump the device tree to check.

sudo dtc -I fs -O dts -o extracted_proc.dts /proc/device-tree