i.MX Yocto Project: VBUSVALID and VDD5V Brownout configuration

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i.MX Yocto Project: VBUSVALID and VDD5V Brownout configuration

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dgotfroi
Contributor IV

Hello,

Can you please tell me, how and where can I configure VBUSVALID voltage and VDD5V Brownout voltage ?

I use Yocto with bitbake + Linux kernel 3.12.

I read the AP AN4199 "Using the i.MX28 Power Management Unit and Battery Charger", and it said :

"VBUSVALID

The threshold value for a valid 5-V status is configured in the software, and the default value is 4.4 V on the Linux BSP. "

and

"VDD5V Brownout

The VDD5V-source

brownout level is a voltage threshold and is an absolute voltage value as in the case of a battery brownout.

There are four available settings for VBUS droop brownout:

• 4.3 V

• 4.4 V

• 4.5 V

• 4.7 V

Each setting has a 50-mV hysteresis to prevent chattering. It is set to 4.5 V in the Linux BSP "

But I would like to know in which file do i need to make the modifications and how ?

Many thanks in advance.

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