clocksource/drivers/timer-ti-dm: Switch to platform_get_irq

platform_get_resource(pdev, IORESOURCE_IRQ) is not recommended for
requesting IRQ's resources, as they can be not ready yet. Using
platform_get_irq() instead is preferred for getting IRQ even if it
was not retrieved earlier.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20191221173027.30716-5-tiny.windzz@gmail.com

drivers/clocksource/timer-ti-dm.c

@@ -780,7 +780,6 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
 {
 	unsigned long flags;
 	struct omap_dm_timer *timer;
-	struct resource *irq;
 	struct device *dev = &pdev->dev;
 	const struct dmtimer_platform_data *pdata;
 	int ret;
@@ -796,11 +795,9 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (unlikely(!irq)) {
-		dev_err(dev, "%s: no IRQ resource.\n", __func__);
-		return -ENODEV;
-	}
+	timer->irq = platform_get_irq(pdev, 0);
+	if (timer->irq < 0)
+		return timer->irq;
 
 	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
 	if (!timer)
@@ -830,7 +827,6 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
 	if (pdata)
 		timer->errata = pdata->timer_errata;
 
-	timer->irq = irq->start;
 	timer->pdev = pdev;
 
 	pm_runtime_enable(dev);