pinctrl: armada-37xx: Convert to immutable irq_chip

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

Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230403-immutable-irqchips-v1-3-503788a7f6e6@linaro.org

Author: Linus Walleij

drivers/pinctrl/mvebu/pinctrl-armada-37xx.c

@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/string_helpers.h>
 
@@ -101,7 +102,6 @@ struct armada_37xx_pinctrl {
 	const struct armada_37xx_pin_data	*data;
 	struct device			*dev;
 	struct gpio_chip		gpio_chip;
-	struct irq_chip			irq_chip;
 	raw_spinlock_t			irq_lock;
 	struct pinctrl_desc		pctl;
 	struct pinctrl_dev		*pctl_dev;
@@ -548,6 +548,7 @@ static void armada_37xx_irq_mask(struct irq_data *d)
 	val = readl(info->base + reg);
 	writel(val & ~d->mask, info->base + reg);
 	raw_spin_unlock_irqrestore(&info->irq_lock, flags);
+	gpiochip_disable_irq(chip, irqd_to_hwirq(d));
 }
 
 static void armada_37xx_irq_unmask(struct irq_data *d)
@@ -557,6 +558,7 @@ static void armada_37xx_irq_unmask(struct irq_data *d)
 	u32 val, reg = IRQ_EN;
 	unsigned long flags;
 
+	gpiochip_enable_irq(chip, irqd_to_hwirq(d));
 	armada_37xx_irq_update_reg(&reg, d);
 	raw_spin_lock_irqsave(&info->irq_lock, flags);
 	val = readl(info->base + reg);
@@ -729,11 +731,30 @@ static unsigned int armada_37xx_irq_startup(struct irq_data *d)
 	return 0;
 }
 
+static void armada_37xx_irq_print_chip(struct irq_data *d, struct seq_file *p)
+{
+	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+	struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
+
+	seq_printf(p, info->data->name);
+}
+
+static const struct irq_chip armada_37xx_irqchip = {
+	.irq_ack = armada_37xx_irq_ack,
+	.irq_mask = armada_37xx_irq_mask,
+	.irq_unmask = armada_37xx_irq_unmask,
+	.irq_set_wake = armada_37xx_irq_set_wake,
+	.irq_set_type = armada_37xx_irq_set_type,
+	.irq_startup = armada_37xx_irq_startup,
+	.irq_print_chip = armada_37xx_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int armada_37xx_irqchip_register(struct platform_device *pdev,
 					struct armada_37xx_pinctrl *info)
 {
 	struct gpio_chip *gc = &info->gpio_chip;
-	struct irq_chip *irqchip = &info->irq_chip;
 	struct gpio_irq_chip *girq = &gc->irq;
 	struct device_node *np = to_of_node(gc->fwnode);
 	struct device *dev = &pdev->dev;
@@ -751,14 +772,7 @@ static int armada_37xx_irqchip_register(struct platform_device *pdev,
 	if (IS_ERR(info->base))
 		return PTR_ERR(info->base);
 
-	irqchip->irq_ack = armada_37xx_irq_ack;
-	irqchip->irq_mask = armada_37xx_irq_mask;
-	irqchip->irq_unmask = armada_37xx_irq_unmask;
-	irqchip->irq_set_wake = armada_37xx_irq_set_wake;
-	irqchip->irq_set_type = armada_37xx_irq_set_type;
-	irqchip->irq_startup = armada_37xx_irq_startup;
-	irqchip->name = info->data->name;
-	girq->chip = irqchip;
+	gpio_irq_chip_set_chip(girq, &armada_37xx_irqchip);
 	girq->parent_handler = armada_37xx_irq_handler;
 	/*
 	 * Many interrupts are connected to the parent interrupt