OV2740 driver development

Autonomous Machines Jetson & Embedded Systems Jetson TX2
#1

I try to develop a driver for OV2740 in TX2. My steps is as follow:

  1. Sort out all file contain the word “OV5693” as a reference.
  2. Create the file “ov2740.c”, ov2740.h" & “ov2740_mode_tbls.h”.
  3. I noticed that the file “tegra210-jetson-cv-camera-modules.dtsi” contain the following code:
    i2c@546C0000 {
    e3326_cam0: ov5639_c@36 {
    status = “disabled”;
    };
    …
    cam_tca9548_77: tca9548@77 {
    status = “disabled”;
    i2c@0 {
    e3333_cam0: ov5693_a@36 {
    status = “disabled”;
    };
    …

I intend to copy this section of code then change the word “ov5639” to “ov2740”.

My question is as below:

  1. What is the meaning of those numbers “546C0000”, “e3326”, “@36”, “tca9548_77”. “@77” & “e3333”?
  2. What number I should use after I copy this section of code and change the wording to “OV2740”?
  3. Is there any other advice for developing driver for “OV2740”?

Thx.

#2

Moving this to the Jetson TX2 forum for better visibility.

#3

hello albert.siu,

  1. you’re checking the wrong device tree, TX2 is using tegra186-quill-p3310-1000-c03-00-base.dts file.

  2. 1. What is the meaning of those numbers “546C0000”, “e3326”, “@36”, “tca9548_77”. “@77” & “e3333”?
    “546C0000”: this is the memory address of the i2c, you may check [Tegra X2 (Parker Series SoC) Technical Reference Manual] to have more details.
    “e3326” and “e3333”: this is camera board naming. you may also refer to Tegra Linux Driver Package TX2 Adaptation Guide to have more details.
    “@36”, “tca9548_77”, and “@77”: these were i2c address of specific devices.

  3. please check Tutorials page, there’s webinar training video [V4L2 Sensor Driver Development Tutorial] for your reference.