gpio: tqmx86: Convert to immutable irq_chip

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

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-tqmx86.c

···
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 
 #define TQMX86_NGPIO	8
···
 
 struct tqmx86_gpio_data {
 	struct gpio_chip	chip;
-	struct irq_chip		irq_chip;
 	void __iomem		*io_base;
 	int			irq;
 	raw_spinlock_t		spinlock;
···
 	gpiic &= ~mask;
 	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
 	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
+	gpiochip_disable_irq(&gpio->chip, irqd_to_hwirq(data));
 }
 
 static void tqmx86_gpio_irq_unmask(struct irq_data *data)
···
 
 	mask = TQMX86_GPII_MASK << (offset * TQMX86_GPII_BITS);
 
+	gpiochip_enable_irq(&gpio->chip, irqd_to_hwirq(data));
 	raw_spin_lock_irqsave(&gpio->spinlock, flags);
 	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
 	gpiic &= ~mask;
···
 	clear_bit(3, valid_mask);
 }
 
+static void tqmx86_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	seq_printf(p, gc->label);
+}
+
+static const struct irq_chip tqmx86_gpio_irq_chip = {
+	.irq_mask = tqmx86_gpio_irq_mask,
+	.irq_unmask = tqmx86_gpio_irq_unmask,
+	.irq_set_type = tqmx86_gpio_irq_set_type,
+	.irq_print_chip = tqmx86_gpio_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int tqmx86_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
···
 	pm_runtime_enable(&pdev->dev);
 
 	if (irq > 0) {
-		struct irq_chip *irq_chip = &gpio->irq_chip;
 		u8 irq_status;
-
-		irq_chip->name = chip->label;
-		irq_chip->irq_mask = tqmx86_gpio_irq_mask;
-		irq_chip->irq_unmask = tqmx86_gpio_irq_unmask;
-		irq_chip->irq_set_type = tqmx86_gpio_irq_set_type;
 
 		/* Mask all interrupts */
 		tqmx86_gpio_write(gpio, 0, TQMX86_GPIIC);
···
 		tqmx86_gpio_write(gpio, irq_status, TQMX86_GPIIS);
 
 		girq = &chip->irq;
-		girq->chip = irq_chip;
+		gpio_irq_chip_set_chip(girq, &tqmx86_gpio_irq_chip);
 		girq->parent_handler = tqmx86_gpio_irq_handler;
 		girq->num_parents = 1;
 		girq->parents = devm_kcalloc(&pdev->dev, 1,