pinctrl: at91: use gpiolib API to mark a GPIO used as an IRQ

When an IRQ is started on a GPIO line, mark this GPIO as IRQ in
the gpiolib so we can keep track of the usage centrally.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index d990e33..71247f4 100644 (file)
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -1325,6 +1325,31 @@ static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
        return 0;
 }
 
+static unsigned int gpio_irq_startup(struct irq_data *d)
+{
+       struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
+       unsigned        pin = d->hwirq;
+       int ret;
+
+       ret = gpio_lock_as_irq(&at91_gpio->chip, pin);
+       if (ret) {
+               dev_err(at91_gpio->chip.dev, "unable to lock pind %lu IRQ\n",
+                       d->hwirq);
+               return ret;
+       }
+       gpio_irq_unmask(d);
+       return 0;
+}
+
+static void gpio_irq_shutdown(struct irq_data *d)
+{
+       struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
+       unsigned        pin = d->hwirq;
+
+       gpio_irq_mask(d);
+       gpio_unlock_as_irq(&at91_gpio->chip, pin);
+}
+
 #ifdef CONFIG_PM
 
 static u32 wakeups[MAX_GPIO_BANKS];
@@ -1399,6 +1424,8 @@ void at91_pinctrl_gpio_resume(void)
 
 static struct irq_chip gpio_irqchip = {
        .name           = "GPIO",
+       .irq_startup    = gpio_irq_startup,
+       .irq_shutdown   = gpio_irq_shutdown,
        .irq_disable    = gpio_irq_mask,
        .irq_mask       = gpio_irq_mask,
        .irq_unmask     = gpio_irq_unmask,