watchdog: introduce a u-boot,autostart property
This is a companion to u-boot,noautostart. If one has a single
watchdog device that one does want to have auto-started, but several
others that one doesn't, the only way currently is to set the
CONFIG_WATCHDOG_AUTOSTART and then use the opt-out for the majority.
The main motivation for this is to add an autostarted watchdog device
to the sandbox (to test a fix) without having to set AUTOSTART in
sandbox_defconfig and add the noautostart property to the existing
devices. But it's also nice for symmetry, and the logic in
init_watchdog_dev() becomes simpler to read because we avoid all the
negations.
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
diff --git a/doc/device-tree-bindings/watchdog/common.txt b/doc/device-tree-bindings/watchdog/common.txt
index 9db6dd6..d041fea 100644
--- a/doc/device-tree-bindings/watchdog/common.txt
+++ b/doc/device-tree-bindings/watchdog/common.txt
@@ -6,7 +6,8 @@
be used instead.
- hw_margin_ms : Period used to reset the watchdog in ms
If this period is not defined, the default value is 1000.
-- u-boot,noautostart : Specify that this watchdog should not autostart
- When the config option WATCHDOG_AUTOSTART is set, all enabled
- watchdogs are started. This property allows specifying that this
- watchdog should NOT be started.
+- u-boot,noautostart :
+- u-boot,autostart : These (mutually exclusive) boolean properties can be used to control
+ whether the watchdog is automatically started when probed. If neither
+ are present, the behaviour is determined by the config option
+ WATCHDOG_AUTOSTART.
diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
index 3f342cd..82df0ff 100644
--- a/drivers/watchdog/wdt-uclass.c
+++ b/drivers/watchdog/wdt-uclass.c
@@ -37,8 +37,8 @@
ulong next_reset;
/* Whether watchdog_start() has been called on the device. */
bool running;
- /* No autostart */
- bool noautostart;
+ /* autostart */
+ bool autostart;
struct cyclic_info *cyclic;
};
@@ -72,7 +72,7 @@
dev->name);
}
- if (!IS_ENABLED(CONFIG_WATCHDOG_AUTOSTART) || priv->noautostart) {
+ if (!priv->autostart) {
printf("WDT: Not starting %s\n", dev->name);
return;
}
@@ -267,19 +267,22 @@
* indicated by a hw_margin_ms property.
*/
ulong reset_period = 1000;
- bool noautostart = false;
+ bool autostart = IS_ENABLED(CONFIG_WATCHDOG_AUTOSTART);
struct wdt_priv *priv;
if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
timeout = dev_read_u32_default(dev, "timeout-sec", timeout);
reset_period = dev_read_u32_default(dev, "hw_margin_ms",
4 * reset_period) / 4;
- noautostart = dev_read_bool(dev, "u-boot,noautostart");
+ if (dev_read_bool(dev, "u-boot,noautostart"))
+ autostart = false;
+ else if (dev_read_bool(dev, "u-boot,autostart"))
+ autostart = true;
}
priv = dev_get_uclass_priv(dev);
priv->timeout = timeout;
priv->reset_period = reset_period;
- priv->noautostart = noautostart;
+ priv->autostart = autostart;
/*
* Pretend this device was last reset "long" ago so the first
* watchdog_reset will actually call its ->reset method.