gpio: mlxbf2: Convert to immutable irq_chip

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

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

drivers/gpio/gpio-mlxbf2.c

···
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/resource.h>
+#include <linux/seq_file.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
···
 /* BlueField-2 gpio block context structure. */
 struct mlxbf2_gpio_context {
 	struct gpio_chip gc;
-	struct irq_chip irq_chip;
 
 	/* YU GPIO blocks address */
 	void __iomem *gpio_io;
+	struct device *dev;
 
 	struct mlxbf2_gpio_context_save_regs *csave_regs;
 };
···
 	unsigned long flags;
 	u32 val;
 
+	gpiochip_enable_irq(gc, irqd_to_hwirq(irqd));
 	raw_spin_lock_irqsave(&gs->gc.bgpio_lock, flags);
 	val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE);
 	val |= BIT(offset);
···
 	val &= ~BIT(offset);
 	writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0);
 	raw_spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags);
+	gpiochip_disable_irq(gc, irqd_to_hwirq(irqd));
 }
 
 static irqreturn_t mlxbf2_gpio_irq_handler(int irq, void *ptr)
···
 	return 0;
 }
 
+static void mlxbf2_gpio_irq_print_chip(struct irq_data *irqd,
+				       struct seq_file *p)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+	struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc);
+
+	seq_printf(p, dev_name(gs->dev));
+}
+
+static const struct irq_chip mlxbf2_gpio_irq_chip = {
+	.irq_set_type = mlxbf2_gpio_irq_set_type,
+	.irq_enable = mlxbf2_gpio_irq_enable,
+	.irq_disable = mlxbf2_gpio_irq_disable,
+	.irq_print_chip = mlxbf2_gpio_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 /* BlueField-2 GPIO driver initialization routine. */
 static int
 mlxbf2_gpio_probe(struct platform_device *pdev)
···
 	gs = devm_kzalloc(dev, sizeof(*gs), GFP_KERNEL);
 	if (!gs)
 		return -ENOMEM;
+
+	gs->dev = dev;
 
 	/* YU GPIO block address */
 	gs->gpio_io = devm_platform_ioremap_resource(pdev, 0);
···
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq >= 0) {
-		gs->irq_chip.name = name;
-		gs->irq_chip.irq_set_type = mlxbf2_gpio_irq_set_type;
-		gs->irq_chip.irq_enable = mlxbf2_gpio_irq_enable;
-		gs->irq_chip.irq_disable = mlxbf2_gpio_irq_disable;
-
 		girq = &gs->gc.irq;
-		girq->chip = &gs->irq_chip;
+		gpio_irq_chip_set_chip(girq, &mlxbf2_gpio_irq_chip);
 		girq->handler = handle_simple_irq;
 		girq->default_type = IRQ_TYPE_NONE;
 		/* This will let us handle the parent IRQ in the driver */