gpio: zynq: 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: Michal Simek <michal.simek@xilinx.com>
Cc: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20190809132649.25176-1-linus.walleij@linaro.org

drivers/gpio/gpio-zynq.c

@@ -830,6 +830,7 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 	int ret, bank_num;
 	struct zynq_gpio *gpio;
 	struct gpio_chip *chip;
+	struct gpio_irq_chip *girq;
 	const struct of_device_id *match;
 
 	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
@@ -885,34 +886,38 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err_pm_dis;
 
-	/* report a bug if gpio chip registration fails */
-	ret = gpiochip_add_data(chip, gpio);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to add gpio chip\n");
-		goto err_pm_put;
-	}
-
 	/* disable interrupts for all banks */
 	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
 		writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
 			       ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
 
-	ret = gpiochip_irqchip_add(chip, &zynq_gpio_edge_irqchip, 0,
-				   handle_level_irq, IRQ_TYPE_NONE);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to add irq chip\n");
-		goto err_rm_gpiochip;
+	/* Set up the GPIO irqchip */
+	girq = &chip->irq;
+	girq->chip = &zynq_gpio_edge_irqchip;
+	girq->parent_handler = zynq_gpio_irqhandler;
+	girq->num_parents = 1;
+	girq->parents = devm_kcalloc(&pdev->dev, 1,
+				     sizeof(*girq->parents),
+				     GFP_KERNEL);
+	if (!girq->parents) {
+		ret = -ENOMEM;
+		goto err_pm_put;
 	}
+	girq->parents[0] = gpio->irq;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_level_irq;
 
-	gpiochip_set_chained_irqchip(chip, &zynq_gpio_edge_irqchip, gpio->irq,
-				     zynq_gpio_irqhandler);
+	/* report a bug if gpio chip registration fails */
+	ret = gpiochip_add_data(chip, gpio);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to add gpio chip\n");
+		goto err_pm_put;
+	}
 
 	pm_runtime_put(&pdev->dev);
 
 	return 0;
 
-err_rm_gpiochip:
-	gpiochip_remove(chip);
 err_pm_put:
 	pm_runtime_put(&pdev->dev);
 err_pm_dis: