[PATCH v6 07/12] watchdog: wdt-uclass.c: add wdt_stop_all() helper

[Rasmus Villemoes]

Since the watchdog_dev member of struct global_data is going away in
favor of the wdt-uclass handling all watchdog devices, prepare for
that by adding a helper to call wdt_stop() on all known devices.

If an error is encountered, still do wdt_stop() on remaining devices,
but remember and return the first error seen.

Initially, this will only be used in one single
place (board/alliedtelesis/x530/x530.c).

Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
---
 drivers/watchdog/wdt-uclass.c | 25 +++++++++++++++++++++++++
 include/wdt.h                 |  8 ++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
index 358fc68e27..5b1c0df5d6 100644
--- a/drivers/watchdog/wdt-uclass.c
+++ b/drivers/watchdog/wdt-uclass.c
@@ -116,6 +116,31 @@ int wdt_stop(struct udevice *dev)
 	return ret;
 }
 
+int wdt_stop_all(void)
+{
+	struct wdt_priv *priv;
+	struct udevice *dev;
+	struct uclass *uc;
+	int ret, err;
+
+	ret = uclass_get(UCLASS_WDT, &uc);
+	if (ret)
+		return ret;
+
+	uclass_foreach_dev(dev, uc) {
+		if (!device_active(dev))
+			continue;
+		priv = dev_get_uclass_priv(dev);
+		if (!priv->running)
+			continue;
+		err = wdt_stop(dev);
+		if (!ret)
+			ret = err;
+	}
+
+	return ret;
+}
+
 int wdt_reset(struct udevice *dev)
 {
 	const struct wdt_ops *ops = device_get_ops(dev);
diff --git a/include/wdt.h b/include/wdt.h
index bc242c2eb2..baaa9db08a 100644
--- a/include/wdt.h
+++ b/include/wdt.h
@@ -37,6 +37,14 @@ int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags);
  */
 int wdt_stop(struct udevice *dev);
 
+/*
+ * Stop all registered watchdog devices.
+ *
+ * @return: 0 if ok, first error encountered otherwise (but wdt_stop()
+ * is still called on following devices)
+ */
+int wdt_stop_all(void);
+
 /*
  * Reset the timer, typically restoring the counter to
  * the value configured by start()
-- 
2.31.1