TDA4VM: Watchdog hardware implementation.

Pierre Hsieh said:

Q1 - Which domain, function, or component is using the watchdog?

Main domain has hardware watchdog. You can check the device tree node in Linux:
arch/arm64/boot/dts/ti/k3-j721e-main.dtsi --> main_rti0/main_rti1

driver: drivers/watchdog/rti_wdt.c

The event coming out of RTI goes to ESM, which generates a safety event,
and this in turn is configured to be routed directly to PMIC to issue a system wide reset.

Pierre Hsieh said:

Q2 - Is there a watchdog function in TDA4 PDK?

pdk_jacinto_07_03_00_29/packages/ti/csl/src/ip/rti/V0/priv/rti.c

Pierre Hsieh said:

Q3 - Does the Linux kernel watchdog use TDA4 HW watchdog?

As mentioned earlier. The event coming out of RTI goes to ESM, which generates a safety event,
and this in turn is configured to be routed directly to PMIC to issue a system wide reset.

If you are using the Linux SDK you can test the watchdog feature using the below commands:

cd /opt/ltp/
./runltp -P j721e-idk-gw -f ddt/wdt_test -s "WDT_M_FUNC_WRI"

If there are no further questions the please click on verify answer.

Best Regards,
Keerthy