gpio: thunderx: Convert to immutable irq_chip

Convert the driver to immutable irq-chip with a bit of
intuition.

Whereas in most cases we put the gpiochip_[enable|disable]_irq()
calls in the .irq_mask() and .irq_unmask() callbacks, here
we need to put them in the .irq_enable() and .irq_disable()
callbacks, as this driver uses both .irq_mask() and
.irq_mask_ack().

Cc: Marc Zyngier <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Reviewed-by: Marc Zyngier <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-thunderx.c

···
 	return IRQ_SET_MASK_OK;
 }
 
-static void thunderx_gpio_irq_enable(struct irq_data *data)
+static void thunderx_gpio_irq_enable(struct irq_data *d)
 {
-	irq_chip_enable_parent(data);
-	thunderx_gpio_irq_unmask(data);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
+	irq_chip_enable_parent(d);
+	thunderx_gpio_irq_unmask(d);
 }
 
-static void thunderx_gpio_irq_disable(struct irq_data *data)
+static void thunderx_gpio_irq_disable(struct irq_data *d)
 {
-	thunderx_gpio_irq_mask(data);
-	irq_chip_disable_parent(data);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	thunderx_gpio_irq_mask(d);
+	irq_chip_disable_parent(d);
+	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
 }
 
 /*
···
  * semantics and other acknowledgment tasks associated with the GPIO
  * mechanism.
  */
-static struct irq_chip thunderx_gpio_irq_chip = {
+static const struct irq_chip thunderx_gpio_irq_chip = {
 	.name			= "GPIO",
 	.irq_enable		= thunderx_gpio_irq_enable,
 	.irq_disable		= thunderx_gpio_irq_disable,
···
 	.irq_eoi		= irq_chip_eoi_parent,
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 	.irq_set_type		= thunderx_gpio_irq_set_type,
-
-	.flags			= IRQCHIP_SET_TYPE_MASKED
+	.flags			= IRQCHIP_SET_TYPE_MASKED | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int thunderx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
···
 	chip->set_multiple = thunderx_gpio_set_multiple;
 	chip->set_config = thunderx_gpio_set_config;
 	girq = &chip->irq;
-	girq->chip = &thunderx_gpio_irq_chip;
+	gpio_irq_chip_set_chip(girq, &thunderx_gpio_irq_chip);
 	girq->fwnode = of_node_to_fwnode(dev->of_node);
 	girq->parent_domain =
 		irq_get_irq_data(txgpio->msix_entries[0].vector)->domain;