How to assert the PMIC_STBY_REQ signal of i.MX7Solo

[yuuki]

Dear all,

We use i.MX7Solo and PF3000 on our original board.
PMIC_STBY_REQ signal of i.MX7 is connected to STANDBY signal of PMIC.

We want to enter PMIC in Standby mode.

We want to know the method to drive PMIC_STBY_REQ signal, to enter PMIC in STANDBY mode.
Would you tell me the procedure and the register whom we should set?

Best Regards,
Yuuki

[igorpadykov]

Hi Yuuki

this is special signal which can be set when procesor enters low power mode, please check GPC_SLPCR, bit VSTBY
described in sect.5.5.10.4 System low power control register (GPC_SLPCR) i.MX7S Reference Manual
http://cache.nxp.com/files/32bit/doc/ref_manual/IMX7SRM.pdf
examples can be found in function imx_gpcv2_set_lpm_mode() cpuidle-imx7d.c, gpcv2.c
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-imx/cpuidle-imx7d.c?i...

Best regards
igor
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[yuuki]

Dear Igor-san

Thank you for your support.

We set VSTBY bit of the GPC_SLPCR register.
However, PMIC_STBY_REQ signal is not changed.

We do not understand the reason why PMIC_STBY_REQ signal does not change.
In addition, is there the setting necessary?

May I have advice?

Best Regards,
Yuuki

[yuuki]

Dear Igor-san,

We referred to a code of Linux.
In addition, I referred to 5.5.9.2 Example Code 2 of the reference manual.

However, we cannot assert the PMIC_STBY_REQ signal.

We do not know what is a factor.
Could you teach the conceivable causes?

Best Regards,
Yuuki

[igorpadykov]

Hi Yuuki

could you check on i.MX7D Sabre SD reference board

using sect.6.1. Deep-Sleep mode AN5383 i.MX 7DS Power Consumption Measurement

http://www.nxp.com/assets/documents/data/en/application-notes/AN5383.pdf 

Best regards
igor