pinctrl: lynxpoint: make irq_chip immutable

Since recently, the kernel is nagging about mutable irq_chips:

   "not an immutable chip, please consider fixing it!"

Drop the unneeded copy, flag it as IRQCHIP_IMMUTABLE, add the new
helper functions and call the appropriate gpiolib functions.

While at it, switch hwirq variable to use the correct type for
the sake of consistency.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: andy-shev

drivers/pinctrl/intel/pinctrl-lynxpoint.c

@@ -663,7 +663,7 @@ static void lp_irq_ack(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct intel_pinctrl *lg = gpiochip_get_data(gc);
-	u32 hwirq = irqd_to_hwirq(d);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	void __iomem *reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_STAT);
 	unsigned long flags;
 
@@ -684,10 +684,12 @@ static void lp_irq_enable(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct intel_pinctrl *lg = gpiochip_get_data(gc);
-	u32 hwirq = irqd_to_hwirq(d);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	void __iomem *reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
 	unsigned long flags;
 
+	gpiochip_enable_irq(gc, hwirq);
+
 	raw_spin_lock_irqsave(&lg->lock, flags);
 	iowrite32(ioread32(reg) | BIT(hwirq % 32), reg);
 	raw_spin_unlock_irqrestore(&lg->lock, flags);
@@ -697,30 +699,33 @@ static void lp_irq_disable(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct intel_pinctrl *lg = gpiochip_get_data(gc);
-	u32 hwirq = irqd_to_hwirq(d);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	void __iomem *reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
 	unsigned long flags;
 
 	raw_spin_lock_irqsave(&lg->lock, flags);
 	iowrite32(ioread32(reg) & ~BIT(hwirq % 32), reg);
 	raw_spin_unlock_irqrestore(&lg->lock, flags);
+
+	gpiochip_disable_irq(gc, hwirq);
 }
 
 static int lp_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct intel_pinctrl *lg = gpiochip_get_data(gc);
-	u32 hwirq = irqd_to_hwirq(d);
-	void __iomem *reg = lp_gpio_reg(&lg->chip, hwirq, LP_CONFIG1);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 	unsigned long flags;
+	void __iomem *reg;
 	u32 value;
 
-	if (hwirq >= lg->chip.ngpio)
+	reg = lp_gpio_reg(&lg->chip, hwirq, LP_CONFIG1);
+	if (!reg)
 		return -EINVAL;
 
 	/* Fail if BIOS reserved pin for ACPI use */
 	if (lp_gpio_acpi_use(lg, hwirq)) {
-		dev_err(lg->dev, "pin %u can't be used as IRQ\n", hwirq);
+		dev_err(lg->dev, "pin %lu can't be used as IRQ\n", hwirq);
 		return -EBUSY;
 	}
 
@@ -755,15 +760,16 @@ static int lp_irq_set_type(struct irq_data *d, unsigned int type)
 	return 0;
 }
 
-static struct irq_chip lp_irqchip = {
+static const struct irq_chip lp_irqchip = {
 	.name = "LP-GPIO",
 	.irq_ack = lp_irq_ack,
 	.irq_mask = lp_irq_mask,
 	.irq_unmask = lp_irq_unmask,
 	.irq_enable = lp_irq_enable,
 	.irq_disable = lp_irq_disable,
 	.irq_set_type = lp_irq_set_type,
-	.flags = IRQCHIP_SKIP_SET_WAKE,
+	.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int lp_gpio_irq_init_hw(struct gpio_chip *chip)
@@ -884,7 +890,7 @@ static int lp_gpio_probe(struct platform_device *pdev)
 		struct gpio_irq_chip *girq;
 
 		girq = &gc->irq;
-		girq->chip = &lp_irqchip;
+		gpio_irq_chip_set_chip(girq, &lp_irqchip);
 		girq->init_hw = lp_gpio_irq_init_hw;
 		girq->parent_handler = lp_gpio_irq_handler;
 		girq->num_parents = 1;