gpio: stmpe: 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 <linus.walleij@linaro.org>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Alexandre TORGUE <alexandre.torgue@st.com>
Link: https://lore.kernel.org/r/20200716100638.112451-1-linus.walleij@linaro.org

drivers/gpio/gpio-stmpe.c

@@ -507,6 +507,8 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 	}
 
 	if (irq > 0) {
+		struct gpio_irq_chip *girq;
+
 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 				stmpe_gpio_irq, IRQF_ONESHOT,
 				"stmpe-gpio", stmpe_gpio);
@@ -514,20 +516,16 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
 			goto out_disable;
 		}
-		ret =  gpiochip_irqchip_add_nested(&stmpe_gpio->chip,
-						   &stmpe_gpio_irq_chip,
-						   0,
-						   handle_simple_irq,
-						   IRQ_TYPE_NONE);
-		if (ret) {
-			dev_err(&pdev->dev,
-				"could not connect irqchip to gpiochip\n");
-			goto out_disable;
-		}
 
-		gpiochip_set_nested_irqchip(&stmpe_gpio->chip,
-					    &stmpe_gpio_irq_chip,
-					    irq);
+		girq = &stmpe_gpio->chip.irq;
+		girq->chip = &stmpe_gpio_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;
 	}
 
 	platform_set_drvdata(pdev, stmpe_gpio);