How to wakeup by PMIC_STBY_REQ

[ko-hey]

Hi all

I want to clearfy how to wakeup from standby by PMIC_STBY_REQ.

I tested wakeup from standby by PMIC_STBY_REQ both MCIMX6DL-SDP and SABRE-AI.

But SABRE-AI have never wakedup by PMIC_STBY_REQ.

could someone answer following question ?

Q1.

I use following command to enter standby mode.

echo mem > /sys/power/state

Is it same effect on both board ?

Q2.

When I use echo mem > /sys/power/state command, the vstby bit will set.

Am I correct ?

Q3.

I found that the MCIMX6DL-SDP have PWR_BTN_SNS signal but SABRE-AI doesn't have it.

Does user need to add PWR_BTN_SNS signal for wakeup from standby by PMIC_STBY_REQ ?

Ko-hey

[igorpadykov]

Hi Ko-hey

1. yes

2. correct

3. wake-up is performed by "gpio-key,wakeup;" in dts files, so corresponding gpios should be able to wake:

PWR_BTN_SNS is connected to EIM_D29 in i.MX6Q Sabre SD (spf-27392 schematic p.3)

(it is used for parallel nor flash on Sabre AI board)

linux/arch/arm/boot/dts/imx6qdl-sabresd.dtsi

imx6qdl-sabresd.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel 

        pinctrl_gpio_keys: gpio_keysgrp {
            fsl,pins = <
                MX6QDL_PAD_EIM_D29__GPIO3_IO29 0x1b0b0

gpio-keys {
        compatible = "gpio-keys";
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_gpio_keys>;

        power {
            label = "Power Button";
            gpios = <&gpio3 29 GPIO_ACTIVE_LOW>;
            gpio-key,wakeup;
            linux,code = <KEY_POWER>;
        };

gpio buttons on Sabre AI SCH-26662 p.13 schematic

linux/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi

imx6qdl-sabreauto.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel 

gpio-keys {
        compatible = "gpio-keys1";
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_gpio_keys>;

        home {
            label = "Home";
            gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
            gpio-key,wakeup;

..

Best regards
igor
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[ko-hey]

Hi Igor

Could i.MX6 wake-up from standby by PMIC_STBY_REQ without gpio-key,wakeup ?

If yes, Please tell me how to do that.

Ko-hey

[igorpadykov]

Hi Ko-hey

>Could i.MX6 wake-up from standby by PMIC_STBY_REQ without gpio-key,wakeup ?

no

Best regards
igor

[ko-hey]

Hi igorpadykov

Let me confirm more.

Q1.

In the circuit diagram of SABR-SDP, I think that MX6_ONOFF and PWR_BTN_SNS will be low at the same time when SW1 is pushed.

Are these two signals necessary for returning from DSM ? Or is it only PWR_BTN_SNS ?

Q2.

For the above confirmation, could you verify the operation after removing R22 of SABR - SDP?

Q3.

Can I assign any other GPIO pin to which the function of PWR_BTN_SNS ?

Q4.

It seems that PWR_BTN_SNS is operated with active low.

How long time are required for the input Low section ?

Ko-hey

[igorpadykov]

Hi Ko-hey

for new questions please create new threads.

>Q3. Can I assign any other GPIO pin to which the function of PWR_BTN_SNS ?

yes

Best regards
igor

[ko-hey]

Hi igorpadykov

Thank you for reply.

I posted another thread as follow.

https://community.nxp.com/thread/488559

Could you follow it ?

Ko-hey

[ko-hey]

Hi igorpadykov‌

Do you have sample source for Ltib (3.0.35) ?

Ko-hey

[igorpadykov]

Hi Ko-hey

not, sorry.

Best regards
igor