drivers: watchdog: check if clock device is ready before accessing

Add check for device_is_ready() before accessing clock control devices.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

drivers/watchdog/wdt_esp32.c

@@ -153,6 +153,11 @@ static int wdt_esp32_init(const struct device *dev)
 	const struct wdt_esp32_config *const config = dev->config;
 	struct wdt_esp32_data *data = dev->data;
 
+	if (!device_is_ready(config->clock_dev)) {
+		LOG_ERR("clock control device not ready");
+		return -ENODEV;
+	}
+
 	clock_control_on(config->clock_dev, config->clock_subsys);
 
 	wdt_hal_init(&data->hal, config->wdt_inst, MWDT_TICK_PRESCALER, true);

drivers/watchdog/wdt_mcux_wdog.c

@@ -78,6 +78,11 @@ static int mcux_wdog_install_timeout(const struct device *dev,
 		return -ENOMEM;
 	}
 
+	if (!device_is_ready(config->clock_dev)) {
+		LOG_ERR("clock control device not ready");
+		return -ENODEV;
+	}
+
 	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
 				   &clock_freq)) {
 		return -EINVAL;

drivers/watchdog/wdt_mcux_wdog32.c

@@ -93,6 +93,11 @@ static int mcux_wdog32_install_timeout(const struct device *dev,
 #if DT_NODE_HAS_PROP(DT_INST_PHANDLE(0, clocks), clock_frequency)
 	clock_freq = config->clock_frequency;
 #else /* !DT_NODE_HAS_PROP(DT_INST_PHANDLE(0, clocks), clock_frequency) */
+	if (!device_is_ready(config->clock_dev)) {
+		LOG_ERR("clock control device not ready");
+		return -ENODEV;
+	}
+
 	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
 				   &clock_freq)) {
 		return -EINVAL;

drivers/watchdog/wdt_wwdg_stm32.c

@@ -282,6 +282,11 @@ static int wwdg_stm32_init(const struct device *dev)
 
 	wwdg_stm32_irq_config(dev);
 
+	if (!device_is_ready(clk)) {
+		LOG_ERR("clock control device not ready");
+		return -ENODEV;
+	}
+
 	return clock_control_on(clk, (clock_control_subsys_t *) &cfg->pclken);
 }