STM32MP1waking from Standby by WAKE UP pins

[AKudr.1]

Hello everyone!

I’ve tested wake up from standby mode with Wake up pins PI11 (and PI8). But it is not work 

I have remove all definitions about wake up pins in dts except place where it defines as wake up pins in stm32mp151.dtsi 

Entering in standby mode by putting ‘echo mem > /sys/power/state’. And after that MPU no wakes by I acting on pins PI11 or PI8.

I do not see any WAKE UP Pins in /sys/kernel/debug/wakeup_sources, maybe I need activate it before going to standby?

Do I need set MPU_BEN bit in RCC_MP_BOOTCR before going to standby mode? If yes — how?

Maybe another my misunderstanding?

[OlivierK · Accepted solution]

Hello AKudr.1 (Community Member) 

In fact IRQ EXTI from 55 to 60. are respectively connected to wkup pin 1 to 6. These wakeup pins are hardcoded. you can refer to the Datasheet they are respectively

             wakeup-gpios = <&gpioa 0 GPIO_ACTIVE_HIGH>, 

                                      <&gpioa 2 GPIO_ACTIVE_HIGH>,

                                      <&gpioc 13 GPIO_ACTIVE_HIGH>,

                                      <&gpioi 8 GPIO_ACTIVE_HIGH>,

                                      <&gpioi 11 GPIO_ACTIVE_HIGH>,

                                      <&gpioc 1 GPIO_ACTIVE_HIGH>;

IRQ EXTI 55 corresponds to PA0, IRQ EXTI 56 to PA2, etc..

Therefore to use PI8 and PI11 you need to use respectively in your DT:

interrupts-extended = <&exti_pwr 58 IRQ_TYPE_EDGE_FALLING>;  

interrupts-extended = <&exti_pwr 59 IRQ_TYPE_EDGE_FALLING>;  

The corresponding driver need to use the IRQ EXTI. As an example driver you can use "gpio-keys"

/

...

test_wkup {

        compatible = "gpio-keys";

        #address-cells = <1>;

        #size-cells = <0>;

        autorepeat;

        status = "okay";

        button@4 {

              label = "WakeUp4";

              linux,code = <BTN_1>;

              interrupts-extended = <&exti_pwr 58 IRQ_TYPE_EDGE_FALLING>;

              status = "okay";

              wakeup-source;

        };

};

root@stm32mp1:~# cat /sys/kernel/debug/wakeup_sources              

name      active_count  event_count   wakeup_count  expire_count  e

test_wkup    5        5        0        0       0

10000000.m4   0        0        0        0       0

mmc1      0        0        0        0       0

mmc0      0        0        0        0       0

5c002000.i2c:stpmic@33:onkey  0        0        0       0

alarmtimer.0.auto    0        0        0        0   0

5c004000.rtc  0        0        0        0       0

deleted     0        0        0 

Regards,

Olivier

[AKudr.1]

Thanks you very much. Now I realized how it works. 

---

But unfortunately I faced another problem with device trees. I found in tf-a output after waking from STANDBY this strings:

ERROR: Illegal access to 0xe0000000 in :

ERROR:   Non-Secure

ERROR:   Privilege

ERROR:   Read

But this is another story for another forum thread)