[RFC PATCH v3 5/7] gpio: gpiolib: Add ngirq member to struct gpio_irq_chip
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: 2021-11-10 22:58:44
Also in:
linux-gpio, linux-renesas-soc, lkml
Subsystem:
gpio subsystem, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Linus Torvalds
Number of GPIO IRQ's supported by the chip is not always equal to the number of GPIO pins. For example on Renesas RZ/G2L SoC where it has GPIO0-122 pins but at a give point a maximum of only 32 GPIO pins can be used as IRQ lines in the IRQC domain. This patch adds ngirq member to struct gpio_irq_chip and passes this as a size to irq_domain_create_hierarchy()/irq_domain_create_simple() if it is being set in the driver otherwise fallbacks to using ngpio. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> --- drivers/gpio/gpiolib.c | 4 ++-- include/linux/gpio/driver.h | 8 ++++++++ 2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 30aabef37468..36a8eefe91b9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c@@ -1185,7 +1185,7 @@ static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc) gc->irq.domain = irq_domain_create_hierarchy( gc->irq.parent_domain, 0, - gc->ngpio, + gc->irq.ngirq ? gc->irq.ngirq : gc->ngpio, gc->irq.fwnode, &gc->irq.child_irq_domain_ops, gc);
@@ -1528,7 +1528,7 @@ static int gpiochip_add_irqchip(struct gpio_chip *gc, } else { /* Some drivers provide custom irqdomain ops */ gc->irq.domain = irq_domain_create_simple(fwnode, - gc->ngpio, + gc->irq.ngirq ? gc->irq.ngirq : gc->ngpio, gc->irq.first, gc->irq.domain_ops ?: &gpiochip_domain_ops, gc);
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index a0f9901dcae6..129945bfe3e7 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h@@ -51,6 +51,14 @@ struct gpio_irq_chip { */ const struct irq_domain_ops *domain_ops; + /** + * @ngirq: + * + * The number of GPIO IRQ's handled by this IRQ domain; usually is + * equal to ngpio + */ + u16 ngirq; + #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY /** * @fwnode:
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2.17.1