topic Re: What to mentioned in software if hardware have no PMIC? in i.MX Processors

What to mentioned in software if hardware have no PMIC?

wangvictor — Fri, 20 Apr 2018 06:01:49 GMT

Hi All,

I'm using Android 6.0 and porting it on i.MX6 sabreSD.

First of all, the board I'm using have no PMIC on it.

Is there anything I have to mentioned in software?

What should I modify in the code?

Or any manual for me to read?

Re: What to mentioned in software if hardware have no PMIC?

igorpadykov — Fri, 20 Apr 2018 07:54:48 GMT

Hi victor

one can pay attention to implementation of Low-level Power Management (PM) Driver,

PF100 Regulator Driver, CPU Frequency Scaling (CPUFREQ) Driver, Dynamic Bus Frequency Driver,

Anatop Regulator Driver, they are described in Linux Manual included in linux documentation on

i.MX Software|NXP

As example one can look at NXP i.MX6UL EVK drivers, it has not pmic or BD SabreLite board

GitHub - boundarydevices/linux-imx6 at boundary-imx_4.1.15_1.0.0_ga

Best regards
igor
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Re: What to mentioned in software if hardware have no PMIC?

wangvictor — Mon, 09 Jul 2018 06:57:26 GMT

igorpadykov‌

I'm curious about Low-level Power Management (PM) Driver.

If I have no power management IC but I still set configuration of Low-level Power Management (PM) Driver for yes.

In this case Is that possible that kernel driver will show error while I reboot the system?

I tried to set configuration of Low-level Power Management (PM) Driver for no and start to build code.

But I will get error.

After I trace code to solve the problem I found that there was something did not declare.

So I tried to found where did code declare it.

And I realize If I try to set CONFIG_PM for no than some declaration will be disabled in the code.

So I wondering would kernel driver get error when I set CONFIG_PM for yes?

Re: What to mentioned in software if hardware have no PMIC?

igorpadykov — Mon, 09 Jul 2018 10:33:10 GMT

>If I have no power management IC but I still set configuration of Low-level Power Management (PM) Driver for yes.

>In this case Is that possible that kernel driver will show error while I reboot the system?

yes, pmic is used in low power driver

Best regards
igor