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watchdog: Allow to use CONFIG_WDT without starting watchdog

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>
Pali Rohár 3 anni fa
parent
commit
830d29ac37
2 ha cambiato i file con 18 aggiunte e 0 eliminazioni
  1. 13 0
      drivers/watchdog/Kconfig
  2. 5 0
      drivers/watchdog/wdt-uclass.c

+ 13 - 0
drivers/watchdog/Kconfig

@@ -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 - 0
drivers/watchdog/wdt-uclass.c

@@ -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");