[FAQ] TDA4AEN-Q1: How to measure power consumption on Linux using the on board INA226

Hello,

Using the below patch we can enable the INA226 to measure power on TDA4AEN/AM67-EVM.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/0001_2D00_arm64_2D00_dts_2D00_ti_2D00_k3_2D00_j722s_2D00_evm_2D00_Add_2D00_INA226_2D00_nodes_2D00_for_2D00_power.patch

Download the above patch to:

$SDK_Path/board-support/ti-linux-kernel-6.6.44+git-ti
cd $SDK_Path/board-support/ti-linux-kernel-6.6.44+git-ti
git am 0001-arm64-dts-ti-k3-j722s-evm-Add-INA226-nodes-for-power.patch
cd ../..
make linux

Edit $SDK_Path/Rules.make file sudh that ROOTFS_PART=/media/$USER/root
Insert the SD card of 10.1 SDK.

sudo make linux-install

Once you boot with SD after the above steps you can see the hwmon interfaces in Linux giving Live power numbers:

root@j722s-evm:~# cat /sys/class/hwmon/hwmon*/power1_input
1962500
81250
12500
81250
0
18750
18750
5281250
181250
68750
81250

Above are the power numbers in micro Watts

root@j722s-evm:~# cat /sys/class/hwmon/hwmon*/in1_input                                                                                                          
863
850
3300
1798
749
1800
1798
3300
1099
3295
1801

Above are the voltage rails in milli Volts

Note: I have used the latest 10.1 Linux SDK to enable the feature.

Best Regards,
Keerthy