Reading/Writing i2c (image sensor)

[padraig.mcgloin]

Hello,
I am currently working on a system to stream and adjust camera sensors.
I am trying to read and write i2c (currently utilising i2cdetect, i2cget, etc).

From reading of the device tree files the deserialiser, serialiser and sensor are on the 318000 i2c bus (i2c@3180000; i2c-2 from i2cdetect -l).

From there I think it is going to address 0x70 (tca9546@70) but when I try and read I get a “Device or resource busy” error (i2cget -y 2 0x70 0x000d or i2cdump -y -r 0x0-0xf 2 0x70)

I am wondering if I am trying to read the i2c addresses incorrectly or if this ability even exists?
tested with camera streaming and not streaming

Sensor Device Tree (text format)
tegra194-camera-imx390-a00.txt (34.4 KB)

SerDes Device Tree (text format)
tegra194-p2822-0000-camera-imx390-a00.txt (7.2 KB)

As far as I can tell the system follows the framework guide:
Jetson_GMSL_Camera_Framework_Guide_nv.pdf (1.8 MB)

[ShaneCCC]

The “Device or resource busy” due to kernel driver was locked the resource.
I would suggest to implement debugfs to read/write the sensor REG, you can reference to ov5693 for the debugfs

[padraig.mcgloin]

In order to read/write to i2c registers each device will need additional debugfs code in its driver?

[ShaneCCC]

Yes, that’s right.