MIPI CSI-2 camera with the iMX93: Can't find i2c client device

[enrique001]

Hello Community,

I am trying to connect an OV9281 camera to a custom System-on-Module containing an i.MX93 (Compulab UCM-iMX93). I am using Linux kernel version 6.1.22 and I am compiling the driver included in the kernel source (drivers/media/i2c/ov9282.c) as a built-in module by adding CONFIG_VIDEO_OV9282=y to the kernel configuration.

The device tree that I am using is added below:

/dts-v1/;

#include "ucm-imx93.dtsi" // (includes NXP's imx93.dtsi)
#include "ucm-imx93-lvds.dtsi"

&cameradev {
	status = "okay";
};

&isi_0 {
	status = "okay";

	cap_device {
		status = "okay";
	};
};

&lpi2c3 {
	sensor_ov9281: camera@60 {
		compatible = "ovti,ov9281";
		reg = <0x60>;
		clocks = <&clk IMX93_CLK_MIPI_PHY_CFG>;

		reset-gpios=<&pca9555 11 GPIO_ACTIVE_HIGH>;
		status="okay";

		port {
			ov9281_ep: endpoint {
				remote-endpoint = <&mipi_csi_ep>;
				data-lanes = <1 2>;
				clock-lanes = <0>;
				link-frequencies = /bits/ 64 <400000000>;
			};
		};
	};
};

&mipi_csi {
	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";

	port@0 {
		reg = <0>;
		mipi_csi_ep: endpoint {
			remote-endpoint = <&ov9281_ep>;
			data-lanes = <2>;
			cfg-clk-range = <28>;
			hs-clk-range = <0x2b>;
			bus-type = <4>;
		};
	};
};

Link to ucm-imx93.dtsi 

Link to ucm-imx93-lvds.dtsi

The following logs appear during boot:

[    2.022852] mxc-isi 4ae40000.isi: mxc_isi.0 registered successfully
[    2.030292] mx8-img-md: Registered mxc_isi.0.capture as /dev/video0
[    2.042583] mxc-md 42800000.bus:camera: deferring csi device registration
[    2.050356] dwc-mipi-csi2-host 4ae00000.csi: lanes: 2, name: mxc-mipi-csi2.0

[    2.744418] mx8-img-md: Registered mxc_isi.0.capture as /dev/video0
[    2.755665] mx8-img-md: Can't find i2c client device for camera@60
[    2.762004] mx8-img-md: Unregistered all entities

The error "Can't find i2c client device" appears to come from the kernel module "imx8_media_dev". After boot, no V4L2 subdevice nodes are created under /dev/.

What are some possible reasons why this error might occur, and am I looking in the right place for troubleshooting the V4L2 problem ?

Any advice for troubleshooting this problem would be greatly appreciated.

[enrique001]

Hi Chavira,

Thank you for confirming that the device tree looks good. 

It looks like the camera is being detected at address 0x60 using i2cdetect. 

root@ucm-imx93:~# i2cdetect -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: 70 -- -- -- -- -- -- --

Enrique

[Chavira]

Hi @enrique001!

Thank you for contacting NXP Support!

The device tree looks good, unfortunately, I don´t have access tho the camera and to your SOM.

You can get the documentation of the device tree configuration in the link below:

https://github.com/nxp-imx/linux-imx/blob/ccf0a99701a701fb48a04e31ffe3f9d585a8374a/Documentation/dev...

The problem looks like the i2c bus is not detecting the direction 0x60, I recommend using i2c-tools to detect the i2c direction using the command

i2cdetect -y 2 

Best Regards!

Chavira

[Chavira]

Hi @enrique001!

I see the port@0 defined in "ucm-imx93.dtsi" Do you delete the nodes &mipi_csi and sensor_mipi2 of the"ucm-imx93.dtsi"?

And please confirm if the i2c that you are using is the 2 or 3 because the command "i2cdetect -y 2" is for i2c2.

To check the i2c3 use the command  "i2cdetect -y 3"

Best Regards!

Chavira