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Commit 789fe8a3 authored by Thierry Reding's avatar Thierry Reding Committed by Lina Iyer
Browse files

gpio: Add support for hierarchical IRQ domains 

Hierarchical IRQ domains can be used to stack different IRQ controllers
on top of each other. One specific use-case where this can be useful is
if a power management controller has top-level controls for wakeup
interrupts. In such cases, the power management controller can be a
parent to other interrupt controllers and program additional registers
when an IRQ has its wake capability enabled or disabled.

Change-Id: I3f63cb13c0cd1b602d3205c40648d5e7d3c62d4d
Patch-mainline: https://lore.kernel.org/patchwork/patch/989528/


Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent b058dd78

drivers/gpio/gpiolib.c

+11 −4
Original line number Diff line number Diff line
@@ -1883,7 +1883,9 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, 
		type = IRQ_TYPE_NONE;

	}



	if (!gpiochip->to_irq)

		gpiochip->to_irq = gpiochip_to_irq;



	gpiochip->irq.default_type = type;

	gpiochip->irq.lock_key = lock_key;

	gpiochip->irq.request_key = request_key;
@@ -1893,6 +1895,11 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, 
	else

		ops = &gpiochip_domain_ops;



	if (gpiochip->irq.parent_domain)

		gpiochip->irq.domain = irq_domain_add_hierarchy(gpiochip->irq.parent_domain,

								0, gpiochip->ngpio,

								np, ops, gpiochip);

	else

		gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio,

							     gpiochip->irq.first,

							     ops, gpiochip);

include/linux/gpio/driver.h

+6 −0
Original line number Diff line number Diff line
@@ -47,6 +47,12 @@ struct gpio_irq_chip { 
	 */

	const struct irq_domain_ops *domain_ops;



	/**

	 * @parent_domain:

	 *

	 */

	struct irq_domain *parent_domain;



	/**

	 * @handler:

	 *