pinctrl: intel: 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.

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

drivers/pinctrl/intel/pinctrl-intel.c

@@ -1039,15 +1039,14 @@ static void intel_gpio_irq_ack(struct irq_data *d)
 	}
 }
 
-static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
+static void intel_gpio_irq_mask_unmask(struct gpio_chip *gc, irq_hw_number_t hwirq, bool mask)
 {
-	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 	const struct intel_community *community;
 	const struct intel_padgroup *padgrp;
 	int pin;
 
-	pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp);
+	pin = intel_gpio_to_pin(pctrl, hwirq, &community, &padgrp);
 	if (pin >= 0) {
 		unsigned int gpp, gpp_offset;
 		unsigned long flags;
@@ -1077,12 +1076,20 @@ static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
 
 static void intel_gpio_irq_mask(struct irq_data *d)
 {
-	intel_gpio_irq_mask_unmask(d, true);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+	intel_gpio_irq_mask_unmask(gc, hwirq, true);
+	gpiochip_disable_irq(gc, hwirq);
 }
 
 static void intel_gpio_irq_unmask(struct irq_data *d)
 {
-	intel_gpio_irq_mask_unmask(d, false);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+	gpiochip_enable_irq(gc, hwirq);
+	intel_gpio_irq_mask_unmask(gc, hwirq, false);
 }
 
 static int intel_gpio_irq_type(struct irq_data *d, unsigned int type)
@@ -1157,6 +1164,17 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
 	return 0;
 }
 
+static const struct irq_chip intel_gpio_irq_chip = {
+	.name = "intel-gpio",
+	.irq_ack = intel_gpio_irq_ack,
+	.irq_mask = intel_gpio_irq_mask,
+	.irq_unmask = intel_gpio_irq_unmask,
+	.irq_set_type = intel_gpio_irq_type,
+	.irq_set_wake = intel_gpio_irq_wake,
+	.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
 					    const struct intel_community *community)
 {
@@ -1319,15 +1337,6 @@ static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
 	pctrl->chip.add_pin_ranges = intel_gpio_add_pin_ranges;
 	pctrl->irq = irq;
 
-	/* Setup IRQ chip */
-	pctrl->irqchip.name = dev_name(pctrl->dev);
-	pctrl->irqchip.irq_ack = intel_gpio_irq_ack;
-	pctrl->irqchip.irq_mask = intel_gpio_irq_mask;
-	pctrl->irqchip.irq_unmask = intel_gpio_irq_unmask;
-	pctrl->irqchip.irq_set_type = intel_gpio_irq_type;
-	pctrl->irqchip.irq_set_wake = intel_gpio_irq_wake;
-	pctrl->irqchip.flags = IRQCHIP_MASK_ON_SUSPEND;
-
 	/*
 	 * On some platforms several GPIO controllers share the same interrupt
 	 * line.
@@ -1340,8 +1349,9 @@ static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
 		return ret;
 	}
 
+	/* Setup IRQ chip */
 	girq = &pctrl->chip.irq;
-	girq->chip = &pctrl->irqchip;
+	gpio_irq_chip_set_chip(girq, &intel_gpio_irq_chip);
 	/* This will let us handle the IRQ in the driver */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;