hi all,
I asked a question to add watchdog in maaxboard and maaxboard-mini before here :
https://community.nxp.com/t5/i-MX-Processors/imx8m-maaxboard-and-maaxboar-min-how-to-enable-watch-do...
for maaxboard , code
./autorun-wdog.sh and ./wdt_driver_test.out 2 1 0 works well
and I use ./wdt_driver_test.out 5 10 0 , after time out ,the linux will reboot. that makes sure the watchdog work well.
but for maaxboard-mini:
first I modified the dtb to add the watchdog device and make ./autorun-wdog.sh work well, I can find :
ls /dev/watchdog*
/dev/watchdog /dev/watchdog0
but when I run ./wdt_driver_test.out 5 10 0 , after time out ,the linux is hang on(freeze) and not reboot!
what 's wrong with it?
one of my questions is :
is there a connection between watchdog pin(MX8MM_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B) from microprocessor and reset chip? so that after wathcdog time out, the pin can reset the microprocessor? I remember the watchdog is in side the processor , do not need a outside pin ,right?
Thank you very much.
attached is my watchdog dts patch partial:
+++ patch/arch/arm64/boot/dts/freescale/maaxboard-mini.dtsi 2022-06-08 14:01:05.077745490 -0400
@@ -224,6 +224,12 @@
>;
};
+ pinctrl_wdog: wdoggrp {
+ fsl,pins = <
+ MX8MM_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B 0xc6
+ >;
+ };
+
pinctrl_wlan_gpio: usdhc2grpwlan {
fsl,pins = <
MX8MM_IOMUXC_SD2_RESET_B_GPIO2_IO19 0x41 /* WL_REG_ON */
@@ -498,6 +504,14 @@
};
};
+&wdog1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_wdog>;
+ fsl,ext-reset-output;
+ status = "okay";
+};
+
+
&A53_0 {
arm-supply = <&buck2_reg>;
};
