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gpio: aggregator: Add interrupt support

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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: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Geert Uytterhoeven 2021-12-03 15:06:44 +01:00 • committed by Bartosz Golaszewski
parent 49fdfe6640
commit a00128dfc8
1 changed files with 10 additions and 1 deletions
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11
drivers/gpio/gpio-aggregator.c
View file

@ -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); 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 * gpiochip_fwd_create() - Create a new GPIO forwarder
* @dev: Parent device pointer * @dev: Parent device pointer
@ -411,7 +418,8 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
for (i = 0; i < ngpios; i++) { for (i = 0; i < ngpios; i++) {
struct gpio_chip *parent = gpiod_to_chip(descs[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])) if (gpiod_cansleep(descs[i]))
chip->can_sleep = true; 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->get_multiple = gpio_fwd_get_multiple_locked;
chip->set = gpio_fwd_set; chip->set = gpio_fwd_set;
chip->set_multiple = gpio_fwd_set_multiple_locked; chip->set_multiple = gpio_fwd_set_multiple_locked;
chip->to_irq = gpio_fwd_to_irq;
chip->base = -1; chip->base = -1;
chip->ngpio = ngpios; chip->ngpio = ngpios;
fwd->descs = descs; fwd->descs = descs;