watchdog: davinci: add support for deferred probing

devm_clk_get can fail with EPROBE_DEFER in case the clock provider is
not ready yet. Handle this case gracefully, rather than dumping out
a huge warning.

Signed-off-by: Tero Kristo <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/watchdog/davinci_wdt.c

···
 		return -ENOMEM;
 
 	davinci_wdt->clk = devm_clk_get(dev, NULL);
-	if (WARN_ON(IS_ERR(davinci_wdt->clk)))
+
+	if (IS_ERR(davinci_wdt->clk)) {
+		if (PTR_ERR(davinci_wdt->clk) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "failed to get clock node\n");
 		return PTR_ERR(davinci_wdt->clk);
+	}
 
 	clk_prepare_enable(davinci_wdt->clk);