Documentation: gpio: Advertise irqd_to_hwirq() helper in the examples

Instead of direct dereferencing the IRQ data in order to get HW IRQ number
use the irqd_to_hwirq() helper.

Fixes: 5644b66 ("Documentation: Update the recommended pattern for GPIO irqchips")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Author: andy-shev

Documentation/driver-api/gpio/driver.rst

@@ -430,21 +430,23 @@ call into the core gpiolib code:
   static void my_gpio_mask_irq(struct irq_data *d)
   {
       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+      irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
       /*
        * Perform any necessary action to mask the interrupt,
        * and then call into the core code to synchronise the
        * state.
        */
 
-      gpiochip_disable_irq(gc, d->hwirq);
+      gpiochip_disable_irq(gc, hwirq);
   }
 
   static void my_gpio_unmask_irq(struct irq_data *d)
   {
       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+      irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
-      gpiochip_enable_irq(gc, d->hwirq);
+      gpiochip_enable_irq(gc, hwirq);
 
       /*
        * Perform any necessary action to unmask the interrupt,
@@ -502,21 +504,23 @@ the interrupt separately and go with it:
   static void my_gpio_mask_irq(struct irq_data *d)
   {
       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+      irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
       /*
        * Perform any necessary action to mask the interrupt,
        * and then call into the core code to synchronise the
        * state.
        */
 
-      gpiochip_disable_irq(gc, d->hwirq);
+      gpiochip_disable_irq(gc, hwirq);
   }
 
   static void my_gpio_unmask_irq(struct irq_data *d)
   {
       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+      irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
-      gpiochip_enable_irq(gc, d->hwirq);
+      gpiochip_enable_irq(gc, hwirq);
 
       /*
        * Perform any necessary action to unmask the interrupt,
@@ -577,22 +581,24 @@ In this case the typical set-up will look like this:
   static void my_gpio_mask_irq(struct irq_data *d)
   {
       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+      irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
       /*
        * Perform any necessary action to mask the interrupt,
        * and then call into the core code to synchronise the
        * state.
        */
 
-      gpiochip_disable_irq(gc, d->hwirq);
+      gpiochip_disable_irq(gc, hwirq);
       irq_mask_mask_parent(d);
   }
 
   static void my_gpio_unmask_irq(struct irq_data *d)
   {
       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+      irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
-      gpiochip_enable_irq(gc, d->hwirq);
+      gpiochip_enable_irq(gc, hwirq);
 
       /*
        * Perform any necessary action to unmask the interrupt,