Can not find i2c-8 Orin NX(P3767-0000)

[steven_fu]

hello,
I can’t find i2c-8 in our custom board.

modify the dts, Still invalid, how to check? thanks
Serial-COM6_20240530-142140_session.log (113.5 KB)

[WayneWWW]

Use the following configuration in the device tree to configure pinmux between I2C and DP_AUX, as they cannot be configured using the pinmux spreadsheet.

Example:

    miscreg-dpaux@00100000 {

            compatible = "nvidia,tegra194-misc-dpaux-padctl";
            reg = <0x0 0x00100000 0x0 0xf000>;
            dpaux_default: pinmux@0 {

                    dpaux0_pins {
                            pins = "dpaux-0";
                            function = "i2c";
                    };
            };
    };

    i2c@31b0000 {
            pinctrl-names = "default";
            pinctrl-0 = <&dpaux_default>;
    };

[steven_fu]

modify the dts file as below, still can’t find the i2c-8.

	miscreg-dpaux@00100000 {
		compatible = "nvidia,tegra194-misc-dpaux-padctl";
		reg = <0x0 0x00100000 0x0 0xf000>;
		dpaux_default: pinmux@0 {

			dpaux0_pins {
				pins = "dpaux-3";
				function = "i2c";
			};
		};
	};

	i2c@31e0000 {
			pinctrl-names = "default";
			pinctrl-0 = <&dpaux_default>;

	};

i2c-8 corresponding address is i2c@31e0000,and corresponding dp_aux_ch3_i2c.

How to modify the address miscreg-dpaux@00100000 and reg? I did not find in the reference documentation. thanks

[WayneWWW]

Hi,

Which hardware pin # are you using for this i2c on Jetson?

[steven_fu]

Hi， pin 189 and pin 191.

[WayneWWW]

That pin is i2c@c250000. Not what you are trying to modify.

And that one does not need dpaux node to configure.

[WayneWWW]

dpaux_ch3_i2c totally does not exist on Orin NX/Nano module. It does not have pinout.

[steven_fu]

i2c@c250000 configuration as follow,Still no devices detected,Is there anything else I need modify?

check the i2c0 and i2c1 is ok, it can detect the EEPROM and power monitor. Thanks.

[ShaneCCC]

Please probe the signal by scope to confirm it.

Thanks

[steven_fu]

run command (i2cdetect -r -y 7), and probe the signal as below. no devices detected,Thanks.

[Trumany]

If no ACK got, you should check your I2C device.

[steven_fu]

Thank you. We’ll focus on the I2C device.