[PATCH] drivers: watchdog: wdt-uclass.c: add a property u-boot, noautostart

[Philippe Reynes]

Since commit 492ee6b8d0e7 ("watchdog: wdt-uclass.c: handle all DM
watchdogs in watchdog_reset()"), all the watchdog are started when
the config WATCHDOG_AUTOSTART.

To avoid a binary choice none/all, a property u-boot,noautostart
may be added in the watchdog node of the u-boot device tree to not
autostart this watchdog.

Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
 drivers/watchdog/wdt-uclass.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
index 6d0f473867..dbf556467d 100644
--- a/drivers/watchdog/wdt-uclass.c
+++ b/drivers/watchdog/wdt-uclass.c
@@ -36,6 +36,8 @@ struct wdt_priv {
 	ulong next_reset;
 	/* Whether watchdog_start() has been called on the device. */
 	bool running;
+	/* No autostart */
+	bool noautostart;
 };
 
 static void init_watchdog_dev(struct udevice *dev)
@@ -52,7 +54,7 @@ static void init_watchdog_dev(struct udevice *dev)
 			       dev->name);
 	}
 
-	if (!IS_ENABLED(CONFIG_WATCHDOG_AUTOSTART)) {
+	if (!IS_ENABLED(CONFIG_WATCHDOG_AUTOSTART) || priv->noautostart) {
 		printf("WDT:   Not starting %s\n", dev->name);
 		return;
 	}
@@ -256,16 +258,19 @@ static int wdt_pre_probe(struct udevice *dev)
 	 * indicated by a hw_margin_ms property.
 	 */
 	ulong reset_period = 1000;
+	bool noautostart = false;
 	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");
 	}
 	priv = dev_get_uclass_priv(dev);
 	priv->timeout = timeout;
 	priv->reset_period = reset_period;
+	priv->noautostart = noautostart;
 	/*
 	 * Pretend this device was last reset "long" ago so the first
 	 * watchdog_reset will actually call its ->reset method.
-- 
2.17.1