gpio: pcf857x: 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: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Anders Darander <anders@chargestorm.se>
Cc: Roger Quadros <rogerq@ti.com>
Link: https://lore.kernel.org/r/20200717144835.68150-1-linus.walleij@linaro.org

drivers/gpio/gpio-pcf857x.c

@@ -334,29 +334,19 @@ static int pcf857x_probe(struct i2c_client *client,
 	gpio->out = ~n_latch;
 	gpio->status = gpio->out;
 
-	status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
-	if (status < 0)
-		goto fail;
-
 	/* Enable irqchip if we have an interrupt */
 	if (client->irq) {
-		gpio->irqchip.name = "pcf857x",
-		gpio->irqchip.irq_enable = pcf857x_irq_enable,
-		gpio->irqchip.irq_disable = pcf857x_irq_disable,
-		gpio->irqchip.irq_ack = noop,
-		gpio->irqchip.irq_mask = noop,
-		gpio->irqchip.irq_unmask = noop,
-		gpio->irqchip.irq_set_wake = pcf857x_irq_set_wake,
-		gpio->irqchip.irq_bus_lock = pcf857x_irq_bus_lock,
-		gpio->irqchip.irq_bus_sync_unlock = pcf857x_irq_bus_sync_unlock,
-		status = gpiochip_irqchip_add_nested(&gpio->chip,
-						     &gpio->irqchip,
-						     0, handle_level_irq,
-						     IRQ_TYPE_NONE);
-		if (status) {
-			dev_err(&client->dev, "cannot add irqchip\n");
-			goto fail;
-		}
+		struct gpio_irq_chip *girq;
+
+		gpio->irqchip.name = "pcf857x";
+		gpio->irqchip.irq_enable = pcf857x_irq_enable;
+		gpio->irqchip.irq_disable = pcf857x_irq_disable;
+		gpio->irqchip.irq_ack = noop;
+		gpio->irqchip.irq_mask = noop;
+		gpio->irqchip.irq_unmask = noop;
+		gpio->irqchip.irq_set_wake = pcf857x_irq_set_wake;
+		gpio->irqchip.irq_bus_lock = pcf857x_irq_bus_lock;
+		gpio->irqchip.irq_bus_sync_unlock = pcf857x_irq_bus_sync_unlock;
 
 		status = devm_request_threaded_irq(&client->dev, client->irq,
 					NULL, pcf857x_irq, IRQF_ONESHOT |
@@ -365,10 +355,21 @@ static int pcf857x_probe(struct i2c_client *client,
 		if (status)
 			goto fail;
 
-		gpiochip_set_nested_irqchip(&gpio->chip, &gpio->irqchip,
-					    client->irq);
+		girq = &gpio->chip.irq;
+		girq->chip = &gpio->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_level_irq;
+		girq->threaded = true;
 	}
 
+	status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
+	if (status < 0)
+		goto fail;
+
 	/* Let platform code set up the GPIOs and their users.
 	 * Now is the first time anyone could use them.
 	 */