Some drivers require a way to translate GPIO pins to their IRQ numbers.
This patch adds the .to_irq() gpiolib callback to pinctrl-samsung
driver, which creates (if not present yet) and returns an IRQ mapping
for given GPIO pin.
Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
---
drivers/pinctrl/pinctrl-samsung.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c
index 495b226..8172c1e 100644
--- a/drivers/pinctrl/pinctrl-samsung.c
+++ b/drivers/pinctrl/pinctrl-samsung.c
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/gpio.h>
+#include <linux/irqdomain.h>
#include "core.h"
#include "pinctrl-samsung.h"
@@ -528,6 +529,23 @@ static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
}
/*
+ * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
+ * and a virtual IRQ, if not already present.
+ */
+static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
+ unsigned int virq;
+
+ if (!bank->irq_domain)
+ return -ENXIO;
+
+ virq = irq_create_mapping(bank->irq_domain, offset);
+
+ return (virq) ? : -ENXIO;
+}
+
+/*
* Parse the pin names listed in the 'samsung,pins' property and convert it
* into a list of gpio numbers are create a pin group from it.
*/
@@ -757,6 +775,7 @@ static const struct gpio_chip samsung_gpiolib_chip = {
.get = samsung_gpio_get,
.direction_input = samsung_gpio_direction_input,
.direction_output = samsung_gpio_direction_output,
+ .to_irq = samsung_gpio_to_irq,
.owner = THIS_MODULE,
};
--
1.7.12
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