Switching I2C-1 Clock Speed (100khz→400khz)

Hardware
1

? If the Stereolabs ZED Quad Link Capture Card is already using I2C-1 (I2C Bus 1 on a Jetson AGX Orin’s 40pin header):

Step A: Is it possible to switch the I2C-1’s Clock Speed from the default 100khz to 400khz

Step B: If this is not possible, should my program use a separate bus (I2C-7) at 400khz?

Please look at what I have already done (below) before answering this question →

Question: Is there anything more I could do concerning step A (preferable, as I would not have to remake PCBs), or should I simply do step B?

Thank you

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What I have already tried, concerning step A:

After switching I2C-1’s Clock Speed from 100khz to 400khz by →

  1. Creating a .dts overlay file

/dts-v1/;
/plugin/;

/ {
overlay-name = “AGX Orin I2C-1 400kHz”;
compatible = “nvidia,jetson-agx-orin”;

fragment@0 {
    target-path = "/bus@0/i2c@c240000";
    __overlay__ {
        clock-frequency = <400000>;   // Set bus speed to 400 kHz
    };
};

};

  1. Compiling this into a .dtbo file (myfile.dtbo)

  2. Copying the .dtbo file into the Jetson overlays directory

  3. Finally, opening the extlinux.conf, adding the bolded line after the quad link overlay, and rebooting the Jetson

sudo nano /boot/extlinux/extlinux.conf

OVERLAYS /boot/tegra234-p3737-camera-zedlink-quad-sl-overlay.dtbo

OVERLAYS /boot/dtb/overlays/myfile.dtbo

sudo reboot

This makes the I2C bus 400KHz, but the cameras do not open and they are not found.

  1. BUT, when adding the bolded line before the quad link overlay:

OVERLAYS /boot/dtb/overlays/myfile.dtbo

OVERLAYS /boot/tegra234-p3737-camera-zedlink-quad-sl-overlay.dtbo

The cameras open, but the bus remains at 100khz

Looking at the Stereolabs dts file, I see that I2C@c2400000 (I2C-1 bus) is specifically set to 100KHz.

	i2c@c240000 {
		compatible = "nvidia,tegra194-i2c";
		reg = <0x00 0xc240000 0x00 0x100>;
		interrupts = <0x00 0x1a 0x04>;
		#address-cells = <0x01>;
		#size-cells = <0x00>;
		status = "okay";
		clock-frequency = <0x186a0>;   <--- set at 100KHz
		clocks = <0x03 0x31 0x03 0x66>;

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