watchdog: cadence: 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/615c6c3c46c3ee8e3136725af0ab0b51e1298091.1672474336.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/cadence_wdt.c

@@ -274,11 +274,6 @@ static const struct watchdog_ops cdns_wdt_ops = {
 	.set_timeout = cdns_wdt_settimeout,
 };
 
-static void cdns_clk_disable_unprepare(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 /************************Platform Operations*****************************/
 /**
  * cdns_wdt_probe - Probe call for the device.
@@ -333,21 +328,11 @@ static int cdns_wdt_probe(struct platform_device *pdev)
 	watchdog_stop_on_reboot(cdns_wdt_device);
 	watchdog_set_drvdata(cdns_wdt_device, wdt);
 
-	wdt->clk = devm_clk_get(dev, NULL);
+	wdt->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(wdt->clk))
 		return dev_err_probe(dev, PTR_ERR(wdt->clk),
 				     "input clock not found\n");
 
-	ret = clk_prepare_enable(wdt->clk);
-	if (ret) {
-		dev_err(dev, "unable to enable clock\n");
-		return ret;
-	}
-	ret = devm_add_action_or_reset(dev, cdns_clk_disable_unprepare,
-				       wdt->clk);
-	if (ret)
-		return ret;
-
 	clock_f = clk_get_rate(wdt->clk);
 	if (clock_f <= CDNS_WDT_CLK_75MHZ) {
 		wdt->prescaler = CDNS_WDT_PRESCALE_512;