AM335x and TPS65217C how to go OFF state

Hi Patrick,

It is absolutely incorrect to pull the PMIC_POWER_EN line with a GPIO. See this link for a good explanation of the shutdown process: http://minix-i2c.blogspot.com/2013/07/software-power-off-of-am335x-with.html

Linux has a shutdown command that should do all this, but I'm not a software expert so can't say exactly. You can try it anyway.

Hello,

Thanks for the advice.

I saw the demo of the minix blogspot, but here the power button is programmed as on/off button. At our project the button must work as an on button or reset button and also as a standard gpio button. So the button is connected to PB_IN of the PMIC and with level converter to a GPIO pin of the processor so we can detect when the button is pressed when in normal operation.

Now I have tried a few shutdown command, like: shutdown -h -P now, but the PMIC still stay's on and doesn't go off. 

Kind regards

Patrick

OK, so then when the button is pressed in normal operation you should set an ALARM2 event in the RTC, which will turn off PMIC_POWER_EN. See the AM335X TRM Rev. J section 20.3.3.8.

Hello Biser,

Thanks for the anwser.

Is it possible to set the ALARM2 event in the user space, so we could test it.

Kind regards.

Hello,

Thanks for the information.

I will write it in my application to shutdown all. I just needed to tested out and I followed to next https://groups.google.com/forum/?fromgroups#!topic/beagleboard/K7DuusrJ6G4 guide.

In the Uboot I setup the correct setting for OFF bit in Status register of the PMIC. Then I configured the Alarm2 of the RTC like in the guide. I added 2 minutes above the present time(just for test).

I then go further with the boot of the kernel(command:boot in uBoot), login and run the command; shutdown -h now and waited until alarm2 trigged the PMIC_PWR_EN pin. 

This al works correctly, the PMIC shutdown and  when I push the power button all started up again.

Regards

Patrick