Revert "Revert "pinctrl: lantiq: Implement gpio_chip.to_irq""

This reverts commit 446f59acb70b70a425ea4105277a71eb615327cd.

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-xway.c b/drivers/pinctrl/pinctrl-xway.c
index 412c6b78140a..a13f2b6f6fc0 100644
--- a/drivers/pinctrl/pinctrl-xway.c
+++ b/drivers/pinctrl/pinctrl-xway.c
@@ -1573,6 +1573,22 @@ static int xway_gpio_dir_out(struct gpio_chip *chip, unsigned int pin, int val)
         return 0;
 }
 
+/*
+ * gpiolib gpiod_to_irq callback function.
+ * Returns the mapped IRQ (external interrupt) number for a given GPIO pin.
+ */
+static int xway_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+        struct ltq_pinmux_info *info = dev_get_drvdata(chip->parent);
+        int i;
+
+        for (i = 0; i < info->num_exin; i++)
+                if (info->exin[i] == offset)
+                        return ltq_eiu_get_irq(i);
+
+        return -1;
+}
+
 static struct gpio_chip xway_chip = {
         .label = "gpio-xway",
         .direction_input = xway_gpio_dir_in,
@@ -1581,6 +1597,7 @@ static struct gpio_chip xway_chip = {
         .set = xway_gpio_set,
         .request = gpiochip_generic_request,
         .free = gpiochip_generic_free,
+        .to_irq = xway_gpio_to_irq,
         .base = -1,
 };