i.MX6UL - Can External RTC and internal RTC coexist?

soumyaks — Fri, 17 Feb 2017 11:16:48 GMT

Hi,

I have a battery backed up external RTC PCF8523 which is attached to the I2C1 bus of i.MX6UL. There is also this internal RTC in the SNVS module of i.MX6UL.

The CAAM module of i.MX6UL uses SNVS RTC. Please see @IMPhttps://community.nxp.com/docs/DOC-97359

I am running Linux on i.MX6UL and the RTC framework supports different RTCs to be enumerated differently as in /dev/rtc0, /dev/rtc1.

Is it possible that only CAAM device use the internal RTC and the rest of the device use external battery backed up RTC? What could be the complications in using 2 separate RTCs in software?

Any directions would be very helpful.

Many Thanks,

Soumya

Re: i.MX6UL - Can External RTC and internal RTC coexist?

igorpadykov — Sun, 19 Feb 2017 23:00:31 GMT

Hi Soumya

you are right, seems there should be no problem having external rtc
and using i.MX6 snvs module using own clocks.

Best regards
igor
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topic Re: i.MX6UL - Can External RTC and internal RTC coexist? in i.MX Processors

i.MX6UL - Can External RTC and internal RTC coexist?

Re: i.MX6UL - Can External RTC and internal RTC coexist?