can: ti_hecc: ti_hecc_probe(): 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().

Link: https://lore.kernel.org/all/20211221194508.11737-1-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/ti_hecc.c

@@ -859,7 +859,6 @@ static int ti_hecc_probe(struct platform_device *pdev)
 	struct net_device *ndev = (struct net_device *)0;
 	struct ti_hecc_priv *priv;
 	struct device_node *np = pdev->dev.of_node;
-	struct resource *irq;
 	struct regulator *reg_xceiver;
 	int err = -ENODEV;
 
@@ -904,9 +903,9 @@ static int ti_hecc_probe(struct platform_device *pdev)
 		goto probe_exit_candev;
 	}
 
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!irq) {
-		dev_err(&pdev->dev, "No irq resource\n");
+	ndev->irq = platform_get_irq(pdev, 0);
+	if (ndev->irq < 0) {
+		err = ndev->irq;
 		goto probe_exit_candev;
 	}
 
@@ -920,7 +919,6 @@ static int ti_hecc_probe(struct platform_device *pdev)
 	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
 	spin_lock_init(&priv->mbx_lock);
-	ndev->irq = irq->start;
 	ndev->flags |= IFF_ECHO;
 	platform_set_drvdata(pdev, ndev);
 	SET_NETDEV_DEV(ndev, &pdev->dev);