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gpio: Introduce struct gpio_irq_chip.first

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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>
This commit is contained in:
Thierry Reding 2017-11-07 19:15:58 +01:00 committed by Linus Walleij
parent 60ed54cae8
commit 8302cf5852
2 changed files with 10 additions and 1 deletions
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3
drivers/gpio/gpiolib.c
View File

@ -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;

8
include/linux/gpio/driver.h
View File

@ -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)