watchdog: of_xilinx_wdt: 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 <[e-mail]>
Acked-by: Michal Simek <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/2b041dc823[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/of_xilinx_wdt.c

···
 		return XWT_TIMER_FAILED;
 }
 
-static void xwdt_clk_disable_unprepare(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int xwdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
···
 
 	watchdog_set_nowayout(xilinx_wdt_wdd, enable_once);
 
-	xdev->clk = devm_clk_get(dev, NULL);
+	xdev->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(xdev->clk)) {
 		if (PTR_ERR(xdev->clk) != -ENOENT)
 			return PTR_ERR(xdev->clk);
···
 				 "The watchdog clock freq cannot be obtained\n");
 	} else {
 		pfreq = clk_get_rate(xdev->clk);
-		rc = clk_prepare_enable(xdev->clk);
-		if (rc) {
-			dev_err(dev, "unable to enable clock\n");
-			return rc;
-		}
-		rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare,
-					      xdev->clk);
-		if (rc)
-			return rc;
 	}
 
 	/*