[PATCH v4] gpio-mlxbf2: use platform_get_irq_optional()

[David Thompson <davthompson@nvidia.com>]

The gpio-mlxbf2 driver interfaces with four GPIO controllers,
device instances 0-3. There are two IRQ resources shared between
the four controllers, and they are found in the ACPI table for
instances 0 and 3. The driver should not use platform_get_irq(),
otherwise this error is logged when probing instances 1 and 2:
  mlxbf2_gpio MLNXBF22:01: error -ENXIO: IRQ index 0 not found

Fixes: 2b725265cb08 ("gpio: mlxbf2: Introduce IRQ support")
Cc: stable@vger.kernel.org
Signed-off-by: David Thompson <davthompson@nvidia.com>
Reviewed-by: Shravan Kumar Ramani <shravankr@nvidia.com>
---
v4: updated logic to simply use platform_get_irq_optional()
v3: added version history
v2: added tag "Cc: stable@vger.kernel.org"

 drivers/gpio/gpio-mlxbf2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mlxbf2.c b/drivers/gpio/gpio-mlxbf2.c
index 6f3dda6b635f..390f2e74a9d8 100644
--- a/drivers/gpio/gpio-mlxbf2.c
+++ b/drivers/gpio/gpio-mlxbf2.c
@@ -397,7 +397,7 @@ mlxbf2_gpio_probe(struct platform_device *pdev)
 	gc->ngpio = npins;
 	gc->owner = THIS_MODULE;
 
-	irq = platform_get_irq(pdev, 0);
+	irq = platform_get_irq_optional(pdev, 0);
 	if (irq >= 0) {
 		girq = &gs->gc.irq;
 		gpio_irq_chip_set_chip(girq, &mlxbf2_gpio_irq_chip);
-- 
2.43.2