Keeping GPIO status during suspend to RAM

[GG0712]

Hi NXP team,

We use the s32g399ardb3 as a reference for our custom design board and using BSP35.

I have a low active GPIO (PB_12) and use P3_3V_IO3P3 to pull high by default.

I followed BSP UM Chapter "23.3 Suspend to RAM" to let the board suspend to RAM.

But P3_3V_IO3P3 will close caused  PB_12 change to low.

Currently we control this GPIO dynamic by our Linux kernel driver but I still keep GPIO status to high failed after I add suspend related function.

Should I move GPIO dynamic control in ATF ? 

Thanks

[Joey_z]

hi，GG0712

Thank you for contacting us.

Do you use the RDB3 board? And do you want to use the GPIO (PB_12) as the function of FLEX_LIN2_RX?

BR

Joey

[GG0712]

Hi Joey_z,

We use our design board and use PB_12 as GPIO.

Thanks

[Joey_z · Accepted solution]

hi,GG0712

Thank you for your reply.

Refer to the RMS32G3.pdf and the attachment of S32G_IOMUX.xlsx, the pad of PB_12 state is set to powered down mode during the standby.

So, I think you can set the pin to high level voltage in the standby stage.

You can try to set the LDO3_3v3 for this pin pull up, and set the vr5510 to keep the voltage of LDO3_3v3.

Also, you can try to chose the wakeup pin as the high level voltage in the standby stage.

Hope it can help you.

BR

Joey

[GG0712]

Hi @Joey_z ,

How can I set LDO3_3v3 through your picture ?

Thanks

[Joey_z]

hi，GG0712

Thank you for your reply.

This is the M core PMIC module setting method, it uses the S32DS IDE as the following picture.

It can set the LDO3 and other vr5510 output voltage keeping in standby mode.

This setting is for M Core, the S32G uses the I2C4 to connect with the vr5510. It is the way to keep the LDO3_3v3 using 12C4 for A core.

Hope it can help you.

BR

Joey

[GG0712]

Hi @Joey_z ,

Can this method work if we are not currently using the M core?

Thanks

[Joey_z]

hi，GG0712

Thank you for your reply.

The S32G use the I2C to control the PMIC, generally speaking you can operate the PMIC in A core, but we do not provide the code and document for it.

Also, the PB_12 is the VDD_IO_B domain, you should the voltage of VDD_IO_B if you want to pull up the pin. When you set the VDD_IO_B voltage, may you can try the internal pull up for pin PB_12.

You can find more information about the power supply in the AN14063.

Hope it can help you.

BR

Joey