pinctrl: samsung: Add GPIO to IRQ translation
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@samsung.com> Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Thomas Abraham <thomas.abraham@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -26,6 +26,7 @@
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/irqdomain.h>
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#include "core.h"
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#include "pinctrl-samsung.h"
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@ -527,6 +528,23 @@ static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
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return pinctrl_gpio_direction_output(gc->base + offset);
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}
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/*
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* gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
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* and a virtual IRQ, if not already present.
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*/
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static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
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unsigned int virq;
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if (!bank->irq_domain)
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return -ENXIO;
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virq = irq_create_mapping(bank->irq_domain, offset);
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return (virq) ? : -ENXIO;
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}
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/*
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* Parse the pin names listed in the 'samsung,pins' property and convert it
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* into a list of gpio numbers are create a pin group from it.
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@ -755,6 +773,7 @@ static const struct gpio_chip samsung_gpiolib_chip = {
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.get = samsung_gpio_get,
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.direction_input = samsung_gpio_direction_input,
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.direction_output = samsung_gpio_direction_output,
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.to_irq = samsung_gpio_to_irq,
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.owner = THIS_MODULE,
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};
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