regulator: da9062: Make the use of IRQ optional

This patch makes the use of IRQ optional to make the DA9061/62 usable
for designs that don't have the IRQ pin connected, because the regulator
is usable without IRQ.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Adam Ward <DLG-Adam.Ward.opensource@dm.renesas.com>

drivers/regulator/da9062-regulator.c

@@ -1012,10 +1012,9 @@ static int da9062_regulator_probe(struct platform_device *pdev)
 	}
 
 	/* LDOs overcurrent event support */
-	irq = platform_get_irq_byname(pdev, "LDO_LIM");
-	if (irq < 0)
-		return irq;
-	regulators->irq_ldo_lim = irq;
+	regulators->irq_ldo_lim = platform_get_irq_byname_optional(pdev, "LDO_LIM");
+	if (regulators->irq_ldo_lim < 0)
+		return 0;
 
 	ret = devm_request_threaded_irq(&pdev->dev, irq,
 					NULL, da9062_ldo_lim_event,