[PATCH v5 07/13] gpio: Move irq_chained_parent to struct gpio_irq_chip

[Thierry Reding]

From: Thierry Reding <tred...@nvidia.com>

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 <tred...@nvidia.com>
---
 drivers/gpio/gpiolib.c      | 18 +++++++++++++-----
 include/linux/gpio/driver.h | 19 +++++++++++++++----
 2 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 70b33cfebf4f..1ee52070d19d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1564,7 +1564,8 @@ static void gpiochip_set_cascaded_irqchip(struct 
gpio_chip *gpiochip,
                irq_set_chained_handler_and_data(parent_irq, parent_handler,
                                                 gpiochip);
 
-               gpiochip->irq_chained_parent = parent_irq;
+               gpiochip->irq.parents = &parent_irq;
+               gpiochip->irq.num_parents = 1;
        }
 
        /* Set the parent IRQ for all affected IRQs */
@@ -1713,17 +1714,24 @@ static int gpiochip_to_irq(struct gpio_chip *chip, 
unsigned offset)
  */
 static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
 {
-       unsigned int offset, irq;
+       unsigned int offset;
 
        acpi_gpiochip_free_interrupts(gpiochip);
 
-       if (gpiochip->irq_chained_parent) {
-               irq_set_chained_handler(gpiochip->irq_chained_parent, NULL);
-               irq_set_handler_data(gpiochip->irq_chained_parent, NULL);
+       if (gpiochip->irq.num_parents > 0) {
+               struct gpio_irq_chip *irq = &gpiochip->irq;
+               unsigned int i;
+
+               for (i = 0; i < irq->num_parents; i++) {
+                       irq_set_chained_handler(irq->parents[i], NULL);
+                       irq_set_handler_data(irq->parents[i], NULL);
+               }
        }
 
        /* Remove all IRQ mappings and delete the domain */
        if (gpiochip->irq.domain) {
+               unsigned int irq;
+
                for (offset = 0; offset < gpiochip->ngpio; offset++) {
                        if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
                                continue;
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index be856f003895..31785734462a 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -85,6 +85,21 @@ struct gpio_irq_chip {
         * interrupt.
         */
        void *parent_handler_data;
+
+       /**
+        * @num_parents:
+        *
+        * The number of interrupt parents of a GPIO chip.
+        */
+       unsigned int num_parents;
+
+       /**
+        * @parents:
+        *
+        * A list of interrupt parents of a GPIO chip. This is owned by the
+        * driver, so the core will only reference this list, not modify it.
+        */
+       unsigned int *parents;
 };
 
 static inline struct gpio_irq_chip *to_gpio_irq_chip(struct irq_chip *chip)
@@ -154,9 +169,6 @@ static inline struct gpio_irq_chip *to_gpio_irq_chip(struct 
irq_chip *chip)
  *     safely.
  * @bgpio_dir: shadowed direction register for generic GPIO to clear/set
  *     direction safely.
- * @irq_chained_parent: GPIO IRQ chip parent/bank linux irq number,
- *     provided by GPIO driver for chained interrupt (not for nested
- *     interrupts).
  * @irq_nested: True if set the interrupt handling is nested.
  * @irq_need_valid_mask: If set core allocates @irq_valid_mask with all
  *     bits set to one
@@ -229,7 +241,6 @@ struct gpio_chip {
         * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
         * to handle IRQs for most practical cases.
         */
-       unsigned int            irq_chained_parent;
        bool                    irq_nested;
        bool                    irq_need_valid_mask;
        unsigned long           *irq_valid_mask;
-- 
2.14.1