net: pxa168_eth: Use platform_get_irq() to get the interrupt

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().
Signed-off-by: NLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/pxa168_eth.c

@@ -1388,7 +1388,6 @@ static int pxa168_eth_probe(struct platform_device *pdev)
 {
 	struct pxa168_eth_private *pep = NULL;
 	struct net_device *dev = NULL;
-	struct resource *res;
 	struct clk *clk;
 	struct device_node *np;
 	int err;
@@ -1419,9 +1418,11 @@ static int pxa168_eth_probe(struct platform_device *pdev)
 		goto err_netdev;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	BUG_ON(!res);
-	dev->irq = res->start;
+	err = platform_get_irq(pdev, 0);
+	if (err == -EPROBE_DEFER)
+		goto err_netdev;
+	BUG_ON(dev->irq < 0);
+	dev->irq = err;
 	dev->netdev_ops = &pxa168_eth_netdev_ops;
 	dev->watchdog_timeo = 2 * HZ;
 	dev->base_addr = 0;