Score:0

Real Time Clock

gp flag

I am trying to let a RTC works under Ubuntu 22.04. I have a Kunbus RevPi Core 3+ (i.e. a Raspberry CM 3 with some nice Hardware attached to it) which has on board a PCF2129 from NXP Semiconductor.

I found the driver in the kernel tree rtc-pcf2127 and I have loaded the module:

sudo modprobe rtc-pcf2127

The modules was loaded:

ubuntu@ubuntu:~$ lsmod | grep rtc
rtc_pcf2127            24576  0

But no /dev/rtc has appeared:

ubuntu@ubuntu:~$ sudo ls -al /dev/rtc
ls: cannot access '/dev/rtc': No such file or directory

scanning the i2c bus has no answere too:

ubuntu@ubuntu:~$ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

How could properly use the rtc device?

Thanks

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mangohost

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