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Commit 8302cf58 authored by Thierry Reding's avatar Thierry Reding Committed by Linus Walleij
Browse files

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: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Acked-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 60ed54ca

drivers/gpio/gpiolib.c

+2 −1
Original line number Diff line number Diff line
@@ -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;

include/linux/gpio/driver.h

+8 −0
Original line number Diff line number Diff line
@@ -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)