gpio: cadence: Pass irqchip when adding gpiochip

We need to convert all old gpio irqchips to pass the irqchip
setup along when adding the gpio_chip. For more info see
drivers/gpio/TODO.

For chained irqchips this is a pretty straight-forward
conversion.

Cc: Jan Kotas <[e-mail]>
Cc: Thierry Reding <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Tested-by: Jan Kotas <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpio/gpio-cadence.c

···
 		goto err_revert_dir;
 	}
 
+	/*
+	 * Optional irq_chip support
+	 */
+	irq = platform_get_irq(pdev, 0);
+	if (irq >= 0) {
+		struct gpio_irq_chip *girq;
+
+		girq = &cgpio->gc.irq;
+		girq->chip = &cdns_gpio_irqchip;
+		girq->parent_handler = cdns_gpio_irq_handler;
+		girq->num_parents = 1;
+		girq->parents = devm_kcalloc(&pdev->dev, 1,
+					     sizeof(*girq->parents),
+					     GFP_KERNEL);
+		if (!girq->parents) {
+			ret = -ENOMEM;
+			goto err_disable_clk;
+		}
+		girq->parents[0] = irq;
+		girq->default_type = IRQ_TYPE_NONE;
+		girq->handler = handle_level_irq;
+	}
+
 	ret = devm_gpiochip_add_data(&pdev->dev, &cgpio->gc, cgpio);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 		goto err_disable_clk;
-	}
-
-	/*
-	 * irq_chip support
-	 */
-	irq = platform_get_irq(pdev, 0);
-	if (irq >= 0) {
-		ret = gpiochip_irqchip_add(&cgpio->gc, &cdns_gpio_irqchip,
-					   0, handle_level_irq,
-					   IRQ_TYPE_NONE);
-		if (ret) {
-			dev_err(&pdev->dev, "Could not add irqchip, %d\n",
-				ret);
-			goto err_disable_clk;
-		}
-		gpiochip_set_chained_irqchip(&cgpio->gc, &cdns_gpio_irqchip,
-					     irq, cdns_gpio_irq_handler);
 	}
 
 	cgpio->bypass_orig = ioread32(cgpio->regs + CDNS_GPIO_BYPASS_MODE);