gpio: max732x: Use irqchip template

This makes the driver use the irqchip template to assign
properties to the gpio_irq_chip instead of using the
explicit calls to gpiochip_irqchip_add_nested() and
gpiochip_set_nested_irqchip(). The irqchip is instead
added while adding the gpiochip.

Signed-off-by: Linus Walleij <[e-mail]>
Tested-by: Sam Protsenko <[e-mail]>
Reviewed-by: Sam Protsenko <[e-mail]>
Cc: Sam Protsenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpio/gpio-max732x.c

···
 
 	if (((pdata && pdata->irq_base) || client->irq)
 			&& has_irq != INT_NONE) {
+		struct gpio_irq_chip *girq;
+
 		if (pdata)
 			irq_base = pdata->irq_base;
 		chip->irq_features = has_irq;
···
 				client->irq);
 			return ret;
 		}
-		ret =  gpiochip_irqchip_add_nested(&chip->gpio_chip,
-						   &max732x_irq_chip,
-						   irq_base,
-						   handle_simple_irq,
-						   IRQ_TYPE_NONE);
-		if (ret) {
-			dev_err(&client->dev,
-				"could not connect irqchip to gpiochip\n");
-			return ret;
-		}
-		gpiochip_set_nested_irqchip(&chip->gpio_chip,
-					    &max732x_irq_chip,
-					    client->irq);
+
+		girq = &chip->gpio_chip.irq;
+		girq->chip = &max732x_irq_chip;
+		/* 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_simple_irq;
+		girq->threaded = true;
+		girq->first = irq_base; /* FIXME: get rid of this */
 	}
 
 	return 0;
···
 			return ret;
 	}
 
-	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
+	ret = max732x_irq_setup(chip, id);
 	if (ret)
 		return ret;
 
-	ret = max732x_irq_setup(chip, id);
+	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
 	if (ret)
 		return ret;