gpio: Introduce struct gpio_irq_chip.first
Some GPIO chips cannot support sparse IRQ numbering and therefore need
to manually allocate their interrupt descriptors statically. For these
cases, a driver can pass the first allocated IRQ via the struct
gpio_irq_chip's "first" field and thereby cause the IRQ domain to map
all IRQs during initialization.
Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com>
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>
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 0a3fdd4..a77d4ad 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -128,6 +128,14 @@ struct gpio_irq_chip {
* in IRQ domain of the chip.
*/
unsigned long *valid_mask;
+
+ /**
+ * @first:
+ *
+ * Required for static IRQ allocation. If set, irq_domain_add_simple()
+ * will allocate and map all IRQs during initialization.
+ */
+ unsigned int first;
};
static inline struct gpio_irq_chip *to_gpio_irq_chip(struct irq_chip *chip)