Commit a00128df authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Bartosz Golaszewski
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gpio: aggregator: Add interrupt support 



Currently the GPIO Aggregator does not support interrupts.  This means
that kernel drivers going from a GPIO to an IRQ using gpiod_to_irq(),
and userspace applications using line events do not work.

Add interrupt support by providing a gpio_chip.to_irq() callback, which
just calls into the parent GPIO controller.

Note that this does not implement full interrupt controller (irq_chip)
support, so using e.g. gpio-keys with "interrupts" instead of "gpios"
still does not work.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarBartosz Golaszewski <brgl@bgdev.pl>
parent 49fdfe66

drivers/gpio/gpio-aggregator.c

+10 −1
Original line number Diff line number Diff line
@@ -371,6 +371,13 @@ static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset, 
	return gpiod_set_config(fwd->descs[offset], config);

}



static int gpio_fwd_to_irq(struct gpio_chip *chip, unsigned int offset)

{

	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);



	return gpiod_to_irq(fwd->descs[offset]);

}



/**

 * gpiochip_fwd_create() - Create a new GPIO forwarder

 * @dev: Parent device pointer
@@ -411,7 +418,8 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev, 
	for (i = 0; i < ngpios; i++) {

		struct gpio_chip *parent = gpiod_to_chip(descs[i]);



		dev_dbg(dev, "%u => gpio-%d\n", i, desc_to_gpio(descs[i]));

		dev_dbg(dev, "%u => gpio %d irq %d\n", i,

			desc_to_gpio(descs[i]), gpiod_to_irq(descs[i]));



		if (gpiod_cansleep(descs[i]))

			chip->can_sleep = true;
@@ -429,6 +437,7 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev, 
	chip->get_multiple = gpio_fwd_get_multiple_locked;

	chip->set = gpio_fwd_set;

	chip->set_multiple = gpio_fwd_set_multiple_locked;

	chip->to_irq = gpio_fwd_to_irq;

	chip->base = -1;

	chip->ngpio = ngpios;

	fwd->descs = descs;