From: Thierry Reding <[email protected]> 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 <[email protected]> Signed-off-by: Thierry Reding <[email protected]> --- 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
