topic Re: IMX8MP CSI port 2 configuration in i.MX Processors

IMX8MP CSI port 2 configuration

Vilius — Thu, 20 Nov 2025 15:38:04 GMT

Greetings,

I was wondering what is the correct way to setup the IMX8MP CSI port 2 as a single camera interface with 4 lanes?

I have tried similar stuff to this as we are running a compulab bsp.
https://github.com/compulab-yokneam/linux-compulab/blob/bca57e9940b5454a8c77a3a1bf50bc2a23c6c68e/arch/arm64/boot/dts/compulab/som-imx8m-plus_mipi-csi2.dtsi

But seems like something is not getting wired correctly and the subdev device in v4l2 is not getting brought up.

When running on CSI1, I get the expected result of (and the expected media graph):

root@ucm-imx8m-plus:~# v4l2-ctl --list-devices (): /dev/v4l-subdev0 /dev/v4l-subdev1 /dev/v4l-subdev2 (csi0): /dev/v4l-subdev3 FSL Capture Media Device (platform:32c00000.bus:camera): /dev/media1 VIV (platform:viv0): /dev/video2 vsi_v4l2dec (platform:vsi_v4l2dec): /dev/video1 vsi_v4l2enc (platform:vsi_v4l2enc): /dev/video0 viv_media (platform:vvcam-video.0): /dev/media0

and dmesg output of:

[ 8.715165] mx8-img-md: Registered sensor subdevice: imx67x 4-001a (1) [ 8.720058] enter isp_mi_stop [ 8.722050] mx8-img-md: created link [imx67x 4-001a] => [mxc-mipi-csi2.0] [ 8.731969] mxc-md 32c00000.bus:camera: mxc_md_create_links

But when using a DTB for CSI port 2, then I dont get the subdevices linked/registered.

So my question is what is important to get the subdevice up and running? And how are they getting linked? Does the CSI port 2 require ISP2? Does the registers change or what?

Re: IMX8MP CSI port 2 configuration

Manuel_Salas — Fri, 21 Nov 2025 01:24:09 GMT

Hello @Vilius

I hope you are doing very well.

Please take a look to the imx8mp-frdm-ap1302-dual.dts.

Best regards,

Salas.

Re: IMX8MP CSI port 2 configuration

Vilius — Fri, 21 Nov 2025 11:09:15 GMT

Well, like I mentioned, I have looked into other dtbs with csi port 2, but even checking the one you linked, I still have yet to get the media graph setup correctly.

DTB snippet of what I'm currently trying to use

&i2c5 { pinctrl-0 = <&pinctrl_i2c5>; scl-gpios = <&gpio3 26>; sda-gpios = <&gpio3 27>; status = "okay"; /delete-node/ ov5640_mipi@3c; imx_camera: camera_mipi@1a { compatible = "framos,imx67x"; reg = <0x1a>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_csi_mclk>; clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>; clock-names = "csi_mclk"; csi_id = <1>; en-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>; rst-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>; mipi_csi; status = "okay"; port { camera_mipi_1_ep: endpoint { remote-endpoint = <&mipi_csi1_ep>; data-lanes = <1 2 3 4>; clock-lanes = <0>; max-pixel-frequency = /bits/ 64 <266000000>; }; }; }; }; &mipi_csi_0 { status = "disabled"; }; &mipi_csi_1 { #address-cells = <1>; #size-cells = <0>; status = "okay"; port@1 { reg = <1>; mipi_csi1_ep: endpoint { remote-endpoint = <&camera_mipi_1_ep>; data-lanes = <4>; csis-hs-settle = <13>; csis-clk-settle = <2>; csis-wclk; }; }; }; &isi_0 { status = "disabled"; }; &isi_1 { status = "disabled"; }; &isp_0 { status = "okay"; };

Re: IMX8MP CSI port 2 configuration

Vilius — Mon, 24 Nov 2025 14:33:13 GMT

This DTB works, ensure you load the kernel modules in the correct order.