pinctrl: bcm2835: 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. The BCM2835 has multiple parents so let's
exploit the new facility in the GPIO_IRQCHIP to actually
deal with multiple parents.

Cc: Eric Anholt <eric@anholt.net>
Cc: Thierry Reding <treding@nvidia.com>
[Rebased on changes in the pinctrl tree]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/20190812062729.1892-1-linus.walleij@linaro.org

drivers/pinctrl/bcm/pinctrl-bcm2835.c

@@ -78,7 +78,6 @@
 struct bcm2835_pinctrl {
 	struct device *dev;
 	void __iomem *base;
-	int irq[BCM2835_NUM_IRQS];
 
 	/* note: locking assumes each bank will have its own unsigned long */
 	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
@@ -382,14 +381,14 @@ static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
 	int group;
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(pc->irq); i++) {
-		if (pc->irq[i] == irq) {
+	for (i = 0; i < BCM2835_NUM_IRQS; i++) {
+		if (chip->irq.parents[i] == irq) {
 			group = i;
 			break;
 		}
 	}
 	/* This should not happen, every IRQ has a bank */
-	if (i == ARRAY_SIZE(pc->irq))
+	if (i == BCM2835_NUM_IRQS)
 		BUG();
 
 	chained_irq_enter(host_chip, desc);
@@ -1087,6 +1086,7 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct bcm2835_pinctrl *pc;
+	struct gpio_irq_chip *girq;
 	struct resource iomem;
 	int err, i;
 	const struct of_device_id *match;
@@ -1135,38 +1135,33 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
 		raw_spin_lock_init(&pc->irq_lock[i]);
 	}
 
+	girq = &pc->gpio_chip.irq;
+	girq->chip = &bcm2835_gpio_irq_chip;
+	girq->parent_handler = bcm2835_gpio_irq_handler;
+	girq->num_parents = BCM2835_NUM_IRQS;
+	girq->parents = devm_kcalloc(dev, BCM2835_NUM_IRQS,
+				     sizeof(*girq->parents),
+				     GFP_KERNEL);
+	if (!girq->parents)
+		return -ENOMEM;
+	/*
+	 * Use the same handler for all groups: this is necessary
+	 * since we use one gpiochip to cover all lines - the
+	 * irq handler then needs to figure out which group and
+	 * bank that was firing the IRQ and look up the per-group
+	 * and bank data.
+	 */
+	for (i = 0; i < BCM2835_NUM_IRQS; i++)
+		girq->parents[i] = irq_of_parse_and_map(np, i);
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_level_irq;
+
 	err = gpiochip_add_data(&pc->gpio_chip, pc);
 	if (err) {
 		dev_err(dev, "could not add GPIO chip\n");
 		return err;
 	}
 
-	err = gpiochip_irqchip_add(&pc->gpio_chip, &bcm2835_gpio_irq_chip,
-				   0, handle_level_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_info(dev, "could not add irqchip\n");
-		return err;
-	}
-
-	for (i = 0; i < BCM2835_NUM_IRQS; i++) {
-		pc->irq[i] = irq_of_parse_and_map(np, i);
-
-		if (pc->irq[i] == 0)
-			continue;
-
-		/*
-		 * Use the same handler for all groups: this is necessary
-		 * since we use one gpiochip to cover all lines - the
-		 * irq handler then needs to figure out which group and
-		 * bank that was firing the IRQ and look up the per-group
-		 * and bank data.
-		 */
-		gpiochip_set_chained_irqchip(&pc->gpio_chip,
-					     &bcm2835_gpio_irq_chip,
-					     pc->irq[i],
-					     bcm2835_gpio_irq_handler);
-	}
-
 	match = of_match_node(bcm2835_pinctrl_match, pdev->dev.of_node);
 	if (match) {
 		bcm2835_pinctrl_desc.confops =