Exit from standby

[fpoussin]

EDIT: Found the solution, read for implementation

I'm trying to get the MPU to exit from standby.

PWR_ON goes to 0 as expected on shutdown, so far so good.

I'm using PA2 (WKUP2) but it's not working at all...

Is there anything special to setup in the device tree?

I am using discrete power supplies as instructed in the app notes. (PWR_ON to enable pins)

Here's my dts config for TF-A

&pwr_regulators{
	status = "okay";
	secure-status = "okay";
 
	/* USER CODE BEGIN pwr_regulators */
	system_suspend_supported_soc_modes = <
		STM32_PM_CSLEEP_RUN
		STM32_PM_CSTOP_ALLOW_LP_STOP
		STM32_PM_CSTOP_ALLOW_STANDBY_DDR_SR
	>;
	system_off_soc_mode = <STM32_PM_CSTOP_ALLOW_STANDBY_DDR_OFF>;
	/* USER CODE END pwr_regulators */
};

Linux config part

wkup {
        compatible = "gpio-keys";
        #address-cells = <1>;
        #size-cells = <0>;
        autorepeat;
        status = "okay";
 
        button@2 {
              label = "WakeUp2";
              linux,code = <BTN_1>;
              interrupts-extended = <&exti_pwr 56 IRQ_TYPE_EDGE_RISING>; // PA2
              status = "okay";
              wakeup-source;
        };
	};

Thank you

[fpoussin]

Any ideas?

[fpoussin · Accepted solution]

The issue was the missing gpio-key (it's not documented...)

I've added it in the original post.

[Olivier GALLIEN]

Hi @fpoussin​ ,

Well catch ! We will work to enhance documentation related to Wake Up.

For next time, please avoid using edit of original post and provide solution in comment.

Thx

Olivier