i.MX ProcessorsのトピックRe: Porting OV2735 to IMX8MM

Porting OV2735 to IMX8MM

Sean_Zhang — Mon, 09 Jun 2025 12:52:03 GMT

Hi, I am currently carrying out the porting work of the OV2735 camera module on the IMX8MM platform. Since the official hasn't adapted it, I downloaded the code of kernel version 6.1 from another platform (RK). After some efforts, I debugged the I2C communication successfully, but when I tried to operate the camera for shooting, the device node couldn't be found, and When I used the tools provided by V4L2 for detection, the following was found:

As shown in the figure, I didn't find the camera node. This confused me. When I went back to study the officially adapted OV5640 camera, I found that the official has built its own framework for camera capture of the imx series, which is located in the path linux-imx/drivers/media/platform/mxc/capture, as shown in the following figure.

May I ask whether my next porting work should focus on what this directory does and May I ask if the above figure specifies the flow of MIPI data? Do I need to perform the same operations as in ov5640_mipi_v2.c ? I hope to get some suggestions for the next porting work.

Best wishes

Re: Porting OV2735 to IMX8MM

francis_guindon — Mon, 09 Jun 2025 22:48:52 GMT

Hi @Sean_Zhang,

Could you share your dmesg logs and device tree?

Regards,
Francis Guindon

Embedded SW Engineer at RidgeRun
Contact us: support@ridgerun.com
Developers wiki: https://developer.ridgerun.com/
Website: http://www.ridgerun.com/

Re: Porting OV2735 to IMX8MM

Sean_Zhang — Tue, 10 Jun 2025 01:20:18 GMT

Certainly, I'd be glad to. Below is my device tree configuration (imx8mm-evk.dtsi), which was adapted from the official OV5640 setup.

Next is kernel print about 0v2735.

Regarding my previous question, should I shift the focus of my research to the official framework: mxc?

Best wishes.

Re: Porting OV2735 to IMX8MM

francis_guindon — Tue, 10 Jun 2025 22:45:43 GMT

From what I can see, your driver loads but it does not link with a media device (aka a /dev/videoX). I understand this linking does involve the mxc framework.

However before looking into implementing a change to the framework, I would look to see if there is a missing device tree configuration to help your driver link with a media device.

From your dmesg logs, I can see your driver's subdevice gets registered as m00__ov2735. Could you see what subdevices show up with ` ls /dev/* `?

Regards,
Francis Guindon

Embedded SW Engineer at RidgeRun
Contact us: support@ridgerun.com
Developers wiki: https://developer.ridgerun.com/
Website: http://www.ridgerun.com/

Re: Porting OV2735 to IMX8MM

RutvijTrivedi207 — Tue, 09 Sep 2025 18:47:49 GMT

you may try upstream driver from siliconsignals
https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/?qt=author&q=siliconsignals.io
https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=448e76433fb75e1f7869d96125e974a23a1bba91

This may help.

--
BR
info@siliconsignals.io