watchdog: rzn1: Use devm_clk_get_enabled() helper

The devm_clk_get_enabled() helper:
   - calls devm_clk_get()
   - calls clk_prepare_enable() and registers what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code and avoids the need of a dedicated function used
with devm_add_action_or_reset().
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/b1f8b5453791035ad534bd5ed36b49798ff4d9b2.1672418166.git.christophe.jaillet@wanadoo.frSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/rzn1_wdt.c

@@ -98,11 +98,6 @@ static const struct watchdog_ops rzn1_wdt_ops = {
 	.ping = rzn1_wdt_ping,
 };
 
-static void rzn1_wdt_clk_disable_unprepare(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int rzn1_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -132,23 +127,12 @@ static int rzn1_wdt_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	clk = devm_clk_get(dev, NULL);
+	clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to get the clock\n");
 		return PTR_ERR(clk);
 	}
 
-	ret = clk_prepare_enable(clk);
-	if (ret) {
-		dev_err(dev, "failed to prepare/enable the clock\n");
-		return ret;
-	}
-
-	ret = devm_add_action_or_reset(dev, rzn1_wdt_clk_disable_unprepare,
-				       clk);
-	if (ret)
-		return ret;
-
 	clk_rate = clk_get_rate(clk);
 	if (!clk_rate) {
 		dev_err(dev, "failed to get the clock rate\n");