Alarm can't wake up system from sleep state

[jesselee]

I am using iMX6q to build a system based on Android 5.0. On the system I have an external RTC chip which is powered by a separate battery. The external RTC chip does not have an interrupt line connected iMX.

The external RTC chip is registered under /sys/class/rtc/rtc0. The other rtc of imx6 platform is 20cc034.snvs-rtc-lp and registered under /sys/class/rtc/rtc1(rtc1 used by alarm.).

When I set a alarm, it can't wake up the system from sleep state sometimes, but when the alarm time is past, then I wake up the system manually, the alarm fired immediately.

Anyone know how to fix it?

Thanks.

[igorpadykov]

Hi Jesse

unfortunately such functionality is not supported in nxp bsps,

in general for waking processor RTC should have some interrupt line

(like gpio) connected to iMX.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[jesselee]

ok, thanks.