I2C1 access timeout on Orin NX

[weileng]

Hi,

We used Orin NX 16G SOM, and pinmux config as “Jetson_Orin_NX_Series_+HDMI A03”, which is from Jetson_Orin_NX_series_and_Orin_Nano_series_Pinmux_Config_Template.

However, It got no device and report " I2C transfer timed out"

orin@orin_nx:~$ i2cdetect -y 7
Warning: Can’t use SMBus Quick Write command, will skip some addresses
0 1 2 3 4 5 6 7 8 9 a b c d e f
00:
10:
20:
30: – – – – – – – –
40:
50: – – – – – – – – – – – – – – – –
60:
70:
orin@orin_nx:~$ sudo dmesg | tail -n 20
[sudo] password for lenovo:
[ 3545.595038] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3545.699007] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3545.803003] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3545.907013] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.011015] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.115023] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.219006] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.323055] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.427003] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.530993] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.635003] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.739001] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.842984] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3546.946980] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3547.050979] tegra-i2c c250000.i2c: I2C transfer timed out
[ 3547.155231] tegra-i2c c250000.i2c: I2C transfer timed out

[JerryChang]

hello weileng,

what exactly device is on i2c@c250000? had you update device tree to assign regulator settings?

[weileng]

Hi Jerry

such as MCU controller. Normally, command ‘i2cdetect’ should find such device.
If replace Orin NX with Xavier NX som, command ‘i2cdetect’ can find such MCU deivce.

Also I found Xaviver NX I2C1 is configured as:

hdr40_i2c1: i2c@31e0000 {
    pinctrl-names = "default";
    pinctrl-0 = <&dpaux_default>;
};

While for Orin NX I2C1 is configured as:

hdr40_i2c1: i2c@c250000 { };

I’m not clear how to update device tree as your mentioned. could you please give out more comments how to “assign regulator settings”? Thanks.

[JerryChang]

hello weileng,

please refer to [Jetson Orin NX Series and Orin Nano Series Design Guide] for [Figure 12-1. I2C Connections].
so, it should be used for 3.3V I2C devices, and internal signal is using gen8_i2c.

[weileng]

Hi Jerry

Thanks for your share Guide. I found such note:

It need to enable RCV_33_18_SEL option, is it as ‘3.3V Tolerance Enable’ setting, right?

[JerryChang]

yes, please give it a try.