From: Thierry Reding <treding@xxxxxxxxxx>
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@xxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/gpio/gpiolib.c | 3 ++-
include/linux/gpio/driver.h | 8 ++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 17f4b843f058..35fb13e98d84 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1778,7 +1778,8 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip)
ops = &gpiochip_domain_ops;
gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio,
- 0, ops, gpiochip);
+ gpiochip->irq.first,
+ ops, gpiochip);
if (!gpiochip->irq.domain)
return -EINVAL;
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 3fd7438f3596..241af05498f9 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -129,6 +129,14 @@ 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)
--
2.14.1
--
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