Cannot Access Voltage and Current Monitors with Custom Pinmux

[lphillips]

Related to this post that I made a while ago, I am having a similar problem where our pinmux settings seem to be preventing access to the voltage and current monitors on the Orin NX SOM.

I am trying to read the input voltage/current to the Orin NX SOM by accessing the file path
/sys/bus/i2c/drivers/ina3221/1-0040/hwmon/hwmon3
and reading the output of /curr1_input and /curr1_input /in1_input.

After using our custom pinmux, I can access the /sys/bus/i2c/drivers/ina3221 directory but I do not see the 1-0040 directory available.

Here is what we change in our pinmux:

Signal Name	Changes Required
GPIO03	Output, Drive 1
GPIO06	Input, N/A
SPI1_CS0*	Input, Int PD
SPI1_CS1*	Input, Int PD
UART1_RXD	Input, Int PD
GPIO12	Output, Drive 1
GPIO07	Output, Z
CAM1_PWDN	Output, Z
GPIO09	Output, Z
GPIO01	Output, Z
GPIO04	Output, Drive 1
GPIO05	Output, Drive 0
CAM0_PWDN	Output, Drive 0
I2S0_SCLK	Input, Int PD
I2S0_DOUT	Input, Int PD
I2S0_DIN	Input, Int PU
I2S0_FS	Input, Int PU
DP1_AUX_P	unused_DP_AUX_CH0_P,Not Assigned
DP1_AUX_N	unused_DP_AUX_CH0_N, Not Assigned
DP1_HPD	unused_DP_AUX_CH0_HPD, Not Assigned
I2S1_SCLK	Output,Drive 1
I2S1_DOUT	Output, Drive 1

Which of these changes could cause this issue? Is there any way to get access to voltage/current monitoring once the system is fully booted? If we have an assigned use for these pins, do we have to re-assign the pins whenever we want to access the voltage/current monitor?

[JerryChang]

hello lphillips,

is the general i2c1 still available?
please also check i2c bus under c240000, for instance, /sys/devices/platform/c240000.i2c/i2c-1/1-0040

[lphillips]

Hi @JerryChang

General i2c1 is still available on this device as far as I can tell.

[JerryChang]

hello lphillips

is the hardware monitor nodes available for checking voltage and current?
it should under… /sys/class/hwmon/

[lphillips]

Hi @JerryChang,

I am able to access /sys/class/hwmon, where should the nodes for checking voltage and current be located? This is the result of trying to access /sys/class/hwmon:

Should there be an hwmon3 at this location?

[JerryChang]

it looks the the nodes for checking voltage and current has missing.
could you please narrow down which pinmux change you’ve done to cause INA3221 probing fail?

[lphillips]

This is the question I am asking you @JerryChang, I have highlighted the changes I make to the pinmux in the first post. Do you know which settings could cause this issue?

[JerryChang]

hello lphillips,

this should not due to pinmux modification, we’ve follow the same pinmux settings but we cannot reproduce this locally.