i2c: riic: 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: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Author: prabhakarlad

drivers/i2c/busses/i2c-riic.c

@@ -433,12 +433,12 @@ static int riic_i2c_probe(struct platform_device *pdev)
 	}
 
 	for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) {
-		res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num);
-		if (!res)
-			return -ENODEV;
+		ret = platform_get_irq(pdev, riic_irqs[i].res_num);
+		if (ret < 0)
+			return ret;
 
-		ret = devm_request_irq(&pdev->dev, res->start, riic_irqs[i].isr,
-					0, riic_irqs[i].name, riic);
+		ret = devm_request_irq(&pdev->dev, ret, riic_irqs[i].isr,
+				       0, riic_irqs[i].name, riic);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to request irq %s\n", riic_irqs[i].name);
 			return ret;