[PATCH 2/2] pinctrl: at91-pio4: Use platform_get_irq_optional() to get the interrupt

[Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>]

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_optional().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-at91-pio4.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index fafd1f55cba7..ebfb106be97d 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -1045,7 +1045,6 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 	const char **group_names;
 	const struct of_device_id *match;
 	int i, ret;
-	struct resource	*res;
 	struct atmel_pioctrl *atmel_pioctrl;
 	const struct atmel_pioctrl_data *atmel_pioctrl_data;
 
@@ -1164,16 +1163,15 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 
 	/* There is one controller but each bank has its own irq line. */
 	for (i = 0; i < atmel_pioctrl->nbanks; i++) {
-		res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
-		if (!res) {
+		ret = platform_get_irq_optional(pdev, i);
+		if (ret < 0) {
 			dev_err(dev, "missing irq resource for group %c\n",
 				'A' + i);
-			return -EINVAL;
+			return ret;
 		}
-		atmel_pioctrl->irqs[i] = res->start;
-		irq_set_chained_handler_and_data(res->start,
-			atmel_gpio_irq_handler, atmel_pioctrl);
-		dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
+		atmel_pioctrl->irqs[i] = ret;
+		irq_set_chained_handler_and_data(ret, atmel_gpio_irq_handler, atmel_pioctrl);
+		dev_dbg(dev, "bank %i: irq=%d\n", i, ret);
 	}
 
 	atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
-- 
2.17.1