gpio: pcie-idio-24: Use irqchip template

This makes the driver use the irqchip template to assign
properties to the gpio_irq_chip instead of using the
explicit call to gpiochip_irqchip_add().

The irqchip is instead added while adding the gpiochip.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/20200722110027.192782-1-linus.walleij@linaro.org

drivers/gpio/gpio-pcie-idio-24.c

@@ -457,6 +457,7 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	int err;
 	const size_t pci_bar_index = 2;
 	const char *const name = pci_name(pdev);
+	struct gpio_irq_chip *girq;
 
 	idio24gpio = devm_kzalloc(dev, sizeof(*idio24gpio), GFP_KERNEL);
 	if (!idio24gpio)
@@ -490,6 +491,15 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	idio24gpio->chip.set = idio_24_gpio_set;
 	idio24gpio->chip.set_multiple = idio_24_gpio_set_multiple;
 
+	girq = &idio24gpio->chip.irq;
+	girq->chip = &idio_24_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+
 	raw_spin_lock_init(&idio24gpio->lock);
 
 	/* Software board reset */
@@ -501,13 +511,6 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return err;
 	}
 
-	err = gpiochip_irqchip_add(&idio24gpio->chip, &idio_24_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
-		return err;
-	}
-
 	err = devm_request_irq(dev, pdev->irq, idio_24_irq_handler, IRQF_SHARED,
 		name, idio24gpio);
 	if (err) {