Xavier i2c devicetree

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi
i want to know which dts confiruge the i2c and the address of i2c
AGX xavier

cat /etc/nv_tegra_release
# R32 (release), REVISION: 5.1, GCID: 26202423, BOARD: t186ref, EABI: aarch64, DATE: Fri Feb 19 16:50:29 UTC 2021
3

Looks like there are not in one file but declare in many files.

4

Hi ShaneCCC
Thank you for your fast reply.
can you tell me the i2c1-5 address?

5

Check below list.

                i2c0 = "/i2c@3160000";
                i2c1 = "/i2c@c240000";
                i2c2 = "/i2c@3180000";
                i2c3 = "/i2c@3190000";
                i2c4 = "/bpmp_i2c";
                i2c5 = "/i2c@31b0000";
                i2c6 = "/i2c@31c0000";
                i2c7 = "/i2c@c250000";
                i2c8 = "/i2c@31e0000";
1 Like
6

ShaneCCC Thank you so much

7

Hi ShaneCCC
can you give me a sample dts file to configure i2c1 or other

8

You can reference to the …/hardware/nvidia/platform/t18x/common/kernel-dts/t18x-common-platforms/tegra186-quill-camera-e3326-a00.dtsi

1 Like
9

Thank you ShaneCCC

10

Hi ShaneCCC
how to use the i2c-4 bpmp_i2c
i use it like this but all failed

 i2c@bpmp_i2c{
    	status = "okay";

		frontboard_12@12 {
            compatible = "frontboard";
            reg = <0x12>;
			#address-cells = <1>;
			#size-cells = <0>;
        };

    }
11

I don’t think these pin was out for using.

12

how can i enable the I2C_GP5_DAT and I2C_GP5_CLK
In the pinmux.xls, i find the I2C5 = I2C9, it is confused with me

image
image1048×57 3.18 KB

13

It’s i2c9(SFIO) aka software i2c bus 8.

14

so it’s addree is 31e0000 ?
I2C address
i2c0 = “/i2c@3160000”;
i2c1 = “/i2c@c240000”;
i2c2 = “/i2c@3180000”;
i2c3 = “/i2c@3190000”;
i2c4 = “/bpmp_i2c”;
i2c5 = “/i2c@31b0000”;
i2c6 = “/i2c@31c0000”;
i2c7 = “/i2c@c250000”;

i2c8 = “/i2c@31e0000”;

15

Yes

16

thankyou so much ShaneCCC
i use i2cdetect tool can test the i2c singal, but what should i write in which device tree can make it work
I write like this system report error

/ {
    
    i2c@31e0000{
		clock-frequency = <100000>;
    	status = "okay";
    	
		frontboard_12@12 {
            compatible = "frontboard";
            reg = <0x12>;
			#address-cells = <1>;
			#size-cells = <0>;
        };
    }
    
};
17

Sorry I don’t know what’s frontboard, you may need to check this device driver to add correct context for it.

19

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