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ramips: Switch Teltonika RUT5xx to kernel GPIO-line watchdog driver

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The commit 04e91631e0 ("om-watchdog: add support for Teltonika RUT5xx
(ramips)") used the deprecated om-watchdog daemon to handle the GPIO-line
connected watchdog on the Teltonika RUT5xx.

But this daemon has massive problems since commit 30f61a34b4
("base-files: always use staged sysupgrade"). The process will always be
stopped on sysupgrades. If the sysupgrade takes slightly longer, the
watchdog is not triggered at the correct time and thus the sysupgrade will
interrupted hard by the watchdog sysupgrade. And this hard interrupt can
easily brick the device when there is no fallback (dual-boot, ...).

Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Sven Eckelmann 2022-01-31 14:39:52 +01:00 committed by Hauke Mehrtens
parent d16bd89c71
commit 7c3efd5273
3 changed files with 11 additions and 1 deletions
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9
target/linux/ramips/dts/rt3050_teltonika_rut5xx.dts
View file

@ -33,6 +33,15 @@
linux,code = <KEY_RESTART>;
};
};
watchdog {
compatible = "linux,wdt-gpio";
gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
hw_algo = "toggle";
/* hw_margin_ms is actually 280s but driver limits it to 60s */
hw_margin_ms = <60000>;
always-running;
};
};
&spi0 {

1
target/linux/ramips/image/rt305x.mk
View file

@ -990,7 +990,6 @@ define Device/teltonika_rut5xx
IMAGE_SIZE := 16064k
DEVICE_VENDOR := Teltonika
DEVICE_MODEL := RUT5XX
DEVICE_PACKAGES := om-watchdog
SUPPORTED_DEVICES += rut5xx
endef
TARGET_DEVICES += teltonika_rut5xx

2
target/linux/ramips/rt305x/config-5.10
View file

@ -60,6 +60,8 @@ CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_GENERIC_TIME_VSYSCALL=y
CONFIG_GPIOLIB=y
CONFIG_GPIO_RALINK=y
CONFIG_GPIO_WATCHDOG=y
# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
CONFIG_HANDLE_DOMAIN_IRQ=y
CONFIG_HARDWARE_WATCHPOINTS=y
CONFIG_HAS_DMA=y