gpio: Move irqdomain into struct gpio_irq_chip

In order to consolidate the multiple ways to associate an IRQ chip with
a GPIO chip, move more fields into the new struct gpio_irq_chip.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/intel/pinctrl-baytrail.c

@@ -1627,7 +1627,7 @@ static void byt_gpio_irq_handler(struct irq_desc *desc)
 		pending = readl(reg);
 		raw_spin_unlock(&vg->lock);
 		for_each_set_bit(pin, &pending, 32) {
-			virq = irq_find_mapping(vg->chip.irqdomain, base + pin);
+			virq = irq_find_mapping(vg->chip.irq.domain, base + pin);
 			generic_handle_irq(virq);
 		}
 	}

drivers/pinctrl/intel/pinctrl-cherryview.c

@@ -1523,7 +1523,7 @@ static void chv_gpio_irq_handler(struct irq_desc *desc)
 		unsigned irq, offset;
 
 		offset = pctrl->intr_lines[intr_line];
-		irq = irq_find_mapping(gc->irqdomain, offset);
+		irq = irq_find_mapping(gc->irq.domain, offset);
 		generic_handle_irq(irq);
 	}
 

drivers/pinctrl/intel/pinctrl-intel.c

@@ -1005,7 +1005,7 @@ static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
 			if (padno >= community->npins)
 				break;
 
-			irq = irq_find_mapping(gc->irqdomain,
+			irq = irq_find_mapping(gc->irq.domain,
 					       community->pin_base + padno);
 			generic_handle_irq(irq);