Sensor driver programming : Camera

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

In the Jetson Quick Start Guide for l4t-281, under the section of SENSOR DRIVING PROGRAMMING GUIDE > DEVICE REGISTERATION > USING MAIN PLATFORM DEVICE TREE

I do not have the following file on my system
…/hardware/nvidia/platform/t18x/quill/kernel-dts/tegra186-quill-p3310-1000-a00-00-base.dtsi

The problem I am facing is that /dev/video0 is not created when the driver is loaded although the probe function is success. I am wondering if the missing file is the root cause as the driver is not plug in and due to the missing file, the device tree is not correct

Any pointers ?

2

The path is sources/hardware/nvidia/platform/t18x/quill/kernel-dts/tegra186-quill-p3310-1000-a00-00-base.dts

If you do not have it, I suggest using the ./source_sync.sh to pull the 28.2.1 tags for sources.

Once you do have that file, then you can easily comment out the camera-modules.dtsi and include your device:

#include <t18x-common-platforms/tegra186-quill-common-p3310-1000-a00.dtsi>
#include <t18x-common-platforms/tegra186-quill-power-tree-p3310-1000-a00-00.dtsi>
//#include <t18x-common-platforms/tegra186-quill-camera-modules.dtsi>
#include <t18x-common-modules/tegra186-display-e3320-1000-a00.dtsi>

#include "t18x-common-platforms/tegra186-quill-camera-<YOUR_DEVICE>-a00.dtsi"

I would start here, then work on the next issue(s) if there are any.

3

Hmm… the document says (I have the dtsi file in step 3, but not the dtsi in step 1
/source_sync.sh did not fetch it.

To register a device using main-platform device tree files
• TX2:
hardware/nvidia/platform/t18x/quill/kernel-dts/tegra186-quill-p3310-1000-a00-00-base.dtsi
2. In the DTSI, remove the following line:
• TX2:
#include <t18x-common-plugin-manager/tegra186-quill-camera-plugin-manager.dtsi"
3. Locate and edit the following file:
TX2:
hardware/nvidia/platform/t18x/quill/kernel-dts/tegra186-quill-p3310-1000-a00-00-base.dts
4. In the DTS file, replace the following line:
• TX2:
#include <t18x-common-platforms/tegra186-quill-camera-modules.dtsi>

4

The error I am getting is

[ 5.377256] tegra-vi4 15700000.vi: initialized
[ 5.378516] tegra-vi4 15700000.vi: remote of_device is not enabled /host1x/vi@15700000/ports/port@0/endpoint.
[ 5.378519] tegra-vi4 15700000.vi: all channel register failed

Any ideas

5

Are you sure you’ve added the correct portions to your camera dtsi?

/ {
   host1x {
       vi@15700000 {
           num-channels = <1>;
           ports {
               #address-cells = <1>;
               #size-cells = <0>;
               port@0 {
                   reg = <0>;
                   imx274_vi_in0: endpoint {
                       csi-port = <0>;
                       bus-width = <4>;
                       remote-endpoint = <&liimx274_csi_out0>;
                   };
               };
           };
       };

The other common item I’ve seen is the devname property being wrong; it should be the name of your sensor with the i2c bus, and the reg. e.g. given:

reg = <0x1a>;
i2c@3180000 {
...
//then your devname would be:

devname = "imx274 2-001a"; //or your sensor
6

Thank you. Yes, the error was in the devname. The i2c address was not correct.
For others with similar issue the devname is -00

7

Glad you solved it!