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watchdog: Allow to use CONFIG_WDT without starting watchdog

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In some cases it is useful to compile support for U-Boot command 'wdt'
without starting HW watchdog in early U-Boot phase. For example when the
user want to start the watchdog only on demand by some boot script.

This change adds a new compile option WATCHDOG_AUTOSTART to control whether
U-Boot should automatically start the watchdog during init phase or not.

This option is enabled by default as it was the default behavior prior
introducing this new change. When compiling U-Boot users can decide to turn
this option off.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2021-03-09 14:26:56 +01:00 • committed by Stefan Roese
parent 25e20e347e
commit 830d29ac37
2 changed files with 18 additions and 0 deletions
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13
drivers/watchdog/Kconfig
View file

@ -9,6 +9,19 @@ config WATCHDOG
this option if you want to service enabled watchdog by U-Boot. Disable
this option if you want U-Boot to start watchdog but never service it.
config WATCHDOG_AUTOSTART
bool "Automatically start watchdog timer"
depends on WDT
default y
help
Automatically start watchdog timer and start servicing it during
init phase. Enabled by default. Disable this option if you want
to compile U-Boot with CONFIG_WDT support but do not want to
activate watchdog, like when CONFIG_WDT option is disabled. You
would be able to start watchdog manually by 'wdt' command. Useful
when you want to have support for 'wdt' command but do not want
to have watchdog enabled by default.
config WATCHDOG_TIMEOUT_MSECS
int "Watchdog timeout in msec"
default 128000 if ARCH_MX25 || ARCH_MX31 || ARCH_MX5 || ARCH_MX6

5
drivers/watchdog/wdt-uclass.c
View file

@ -51,6 +51,11 @@ int initr_watchdog(void)
4 * reset_period) / 4;
}
if (!CONFIG_IS_ENABLED(WATCHDOG_AUTOSTART)) {
printf("WDT: Not starting\n");
return 0;
}
ret = wdt_start(gd->watchdog_dev, timeout * 1000, 0);
if (ret != 0) {
printf("WDT: Failed to start\n");