AM62A7-Q1: How to use wakeup_uart as a wakeup source for deep sleep

Abhineet Ranjan

Part Number: AM62A7-Q1

Tool/software:

We have tetsted main_gpios, mcu_gpios and rtc as wakeup sources. We are following the below link
https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/09_02_00/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Power_Management/pm_wakeup_sources.html
but not able to enable wakeup uart as wakeup source.

It is not showing in the cat /proc/interrupts
Still I tried to make it sleep and wake it up. It is not happening.

Below is my device tree. How to enable wkup_uart for waking the system???

....

&wkup_uart0 {
    ....
    wakeup-source;
};

....

Best Regards
Abhineet Ranjan

4 months ago

0 Kendall Willis 4 months ago

TI__Prodigy 330 points

Hi Abhineet,

The WKUP UART will not show up in the /proc/interrupts file. Use the target-module node as a reference when adding the WKUP UART as a wakeup source in the device tree: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi?h=ti-linux-6.1.y#n34

NOTE: To use the WKUP UART as a wakeup source, it has to be configured using the ti-sysc interconnect target module driver as shown in the above example.

Best,

Kendall

0 Abhineet Ranjan 4 months ago in reply to Kendall Willis

Intellectual 635 points

"How to do this above mentioned thing?

Do you have any example??"

0 Anshu Madwesh 4 months ago in reply to Abhineet Ranjan

TI__Mastermind 18560 points

Hi Abhineet,

The instructions to use WKUP UART is stated in the Linux SDK: https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/09_02_00/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Power_Management/pm_wakeup_sources.html#wkup-uart

You'll need to open a new terminal for WKUP UART.

Thanks,

Anshu

Processors

Processors forum

AM62A7-Q1: How to use wakeup_uart as a wakeup source for deep sleep