How to change operating frequency of i2c3 bus

VIM3
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Khadas vim3 Ubuntu

Which version of system do you use? Please provide the version of the system here:

uname -a output:

Linux Khadas 4.9.241 #2 SMP PREEMPT Fri Nov 18 03:18:35 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

Please describe your issue below:

How can I view the i2c3 bus operating frequency and how can I change it? What is the range of valid frequencies?

2

Hello @ericz9002

You can goto /sys/bus/i2c/devices/i2c-3/device to setup the speed.

root@Khadas:/sys/bus/i2c/devices/i2c-3/device# cat speed 
100000
root@Khadas:/sys/bus/i2c/devices/i2c-3/device# echo 400000 > speed 
root@Khadas:/sys/bus/i2c/devices/i2c-3/device# cat speed 
400000
root@Khadas:/sys/bus/i2c/devices/i2c-3/device#

Not tested, but not exceed 400000.

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