...
int fd = open("/dev/video0", O_RDWR);
...
int camIdx = 0;
int input = camIdx;
int ret = ioctl(m_cam_fd, VIDIOC_S_INPUT, &input);
// ret < 0: strerror(errno) == "Inappropriate ioctl for device"

Could you please tell if I'm missing something?
Do I need to select different device or VIDIOC_S_INPUT argument?

After selecting the camera, I was going to use the same approach which worked for rpi zero 2w: VIDIOC_TRY_FMT/VIDIOC_S_FMT/VIDIOC_REQBUFS/VIDIOC_QUERYBUF/VIDIOC_QBUF/VIDIOC_DQBUF, is it possible? Does driver support this?

I'm able to set cam params using mv_mipi_i2c_new.sh and it works (I set different metime values - and I see that laser (connected to cam output) brightness is changing)

v4l2-ctl --set-fmt-video=width=$WIDTH,height=$HEIGHT,pixelformat=GREY --stream-mmap --stream-count=-1 --stream-to=/dev/null

./i2c_tools$ sudo ./mv_mipi_i2c_new.sh -b 2 -w metime 18
./i2c_tools$ sudo ./mv_mipi_i2c_new.sh -b 2 -w metime 180

$ media-ctl -p -d /dev/media0
Media controller API version 5.10.160

Media device information
------------------------
driver          rkcif
model           rkcif_mipi_lvds
serial          
bus info        
hw revision     0x0
driver version  5.10.160

Device topology
- entity 1: stream_cif_mipi_id0 (1 pad, 4 links)
            type Node subtype V4L flags 0
            device node name /dev/video0
	pad0: Sink
		<- "rockchip-mipi-csi2":1 [ENABLED]
		<- "rockchip-mipi-csi2":2 []
		<- "rockchip-mipi-csi2":3 []
		<- "rockchip-mipi-csi2":4 []

- entity 5: stream_cif_mipi_id1 (1 pad, 4 links)
            type Node subtype V4L flags 0
            device node name /dev/video1
	pad0: Sink
		<- "rockchip-mipi-csi2":1 []
		<- "rockchip-mipi-csi2":2 [ENABLED]
		<- "rockchip-mipi-csi2":3 []
		<- "rockchip-mipi-csi2":4 []

- entity 9: stream_cif_mipi_id2 (1 pad, 4 links)
            type Node subtype V4L flags 0
            device node name /dev/video2
	pad0: Sink
		<- "rockchip-mipi-csi2":1 []
		<- "rockchip-mipi-csi2":2 []
		<- "rockchip-mipi-csi2":3 [ENABLED]
		<- "rockchip-mipi-csi2":4 []

- entity 13: stream_cif_mipi_id3 (1 pad, 4 links)
             type Node subtype V4L flags 0
             device node name /dev/video3
	pad0: Sink
		<- "rockchip-mipi-csi2":1 []
		<- "rockchip-mipi-csi2":2 []
		<- "rockchip-mipi-csi2":3 []
		<- "rockchip-mipi-csi2":4 [ENABLED]

- entity 17: rkcif_tools_id0 (1 pad, 4 links)
             type Node subtype V4L flags 0
             device node name /dev/video4
	pad0: Sink
		<- "rockchip-mipi-csi2":1 []
		<- "rockchip-mipi-csi2":2 []
		<- "rockchip-mipi-csi2":3 []
		<- "rockchip-mipi-csi2":4 []

- entity 21: rkcif_tools_id1 (1 pad, 4 links)
             type Node subtype V4L flags 0
             device node name /dev/video5
	pad0: Sink
		<- "rockchip-mipi-csi2":1 []
		<- "rockchip-mipi-csi2":2 []
		<- "rockchip-mipi-csi2":3 []
		<- "rockchip-mipi-csi2":4 []

- entity 25: rkcif_tools_id2 (1 pad, 4 links)
             type Node subtype V4L flags 0
             device node name /dev/video6
	pad0: Sink
		<- "rockchip-mipi-csi2":1 []
		<- "rockchip-mipi-csi2":2 []
		<- "rockchip-mipi-csi2":3 []
		<- "rockchip-mipi-csi2":4 []

- entity 29: rkcif-mipi-luma (0 pad, 0 link)
             type Node subtype V4L flags 0
             device node name /dev/video7

- entity 32: rockchip-mipi-csi2 (5 pads, 29 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev0
	pad0: Sink
		[fmt:Y8_1X8/704x544 field:none
		 crop.bounds:(0,0)/704x544
		 crop:(0,0)/704x544]
		<- "rockchip-csi2-dphy0":1 [ENABLED]
	pad1: Source
		-> "stream_cif_mipi_id0":0 [ENABLED]
		-> "stream_cif_mipi_id1":0 []
		-> "stream_cif_mipi_id2":0 []
		-> "stream_cif_mipi_id3":0 []
		-> "rkcif_tools_id0":0 []
		-> "rkcif_tools_id1":0 []
		-> "rkcif_tools_id2":0 []
	pad2: Source
		-> "stream_cif_mipi_id0":0 []
		-> "stream_cif_mipi_id1":0 [ENABLED]
		-> "stream_cif_mipi_id2":0 []
		-> "stream_cif_mipi_id3":0 []
		-> "rkcif_tools_id0":0 []
		-> "rkcif_tools_id1":0 []
		-> "rkcif_tools_id2":0 []
	pad3: Source
		-> "stream_cif_mipi_id0":0 []
		-> "stream_cif_mipi_id1":0 []
		-> "stream_cif_mipi_id2":0 [ENABLED]
		-> "stream_cif_mipi_id3":0 []
		-> "rkcif_tools_id0":0 []
		-> "rkcif_tools_id1":0 []
		-> "rkcif_tools_id2":0 []
	pad4: Source
		-> "stream_cif_mipi_id0":0 []
		-> "stream_cif_mipi_id1":0 []
		-> "stream_cif_mipi_id2":0 []
		-> "stream_cif_mipi_id3":0 [ENABLED]
		-> "rkcif_tools_id0":0 []
		-> "rkcif_tools_id1":0 []
		-> "rkcif_tools_id2":0 []

- entity 38: rockchip-csi2-dphy0 (2 pads, 2 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev1
	pad0: Sink
		[fmt:Y8_1X8/704x544@100/52300 field:none]
		<- "m00_b_mvcam 2-003b":0 [ENABLED]
	pad1: Source
		-> "rockchip-mipi-csi2":0 [ENABLED]

- entity 43: m00_b_mvcam 2-003b (1 pad, 1 link)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
	pad0: Source
		[fmt:Y8_1X8/704x544@100/52300 field:none]
		-> "rockchip-csi2-dphy0":0 [ENABLED]