gpio: bcm-kona: lock IRQs when starting them

This uses the new API for tagging GPIO lines as in use by
IRQs. This enforces a few semantic checks on how the underlying
GPIO line is used.

Cc: Christian Daudt <csd@broadcom.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Tested-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-bcm-kona.c

@@ -449,12 +449,34 @@ static void bcm_kona_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
+static unsigned int bcm_kona_gpio_irq_startup(struct irq_data *d)
+{
+	struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
+
+	if (gpio_lock_as_irq(&kona_gpio->gpio_chip, d->hwirq))
+		dev_err(kona_gpio->gpio_chip.dev,
+			"unable to lock HW IRQ %lu for IRQ\n",
+			d->hwirq);
+	bcm_kona_gpio_irq_unmask(d);
+	return 0;
+}
+
+static void bcm_kona_gpio_irq_shutdown(struct irq_data *d)
+{
+	struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
+
+	bcm_kona_gpio_irq_mask(d);
+	gpio_unlock_as_irq(&kona_gpio->gpio_chip, d->hwirq);
+}
+
 static struct irq_chip bcm_gpio_irq_chip = {
 	.name = "bcm-kona-gpio",
 	.irq_ack = bcm_kona_gpio_irq_ack,
 	.irq_mask = bcm_kona_gpio_irq_mask,
 	.irq_unmask = bcm_kona_gpio_irq_unmask,
 	.irq_set_type = bcm_kona_gpio_irq_set_type,
+	.irq_startup = bcm_kona_gpio_irq_startup,
+	.irq_shutdown = bcm_kona_gpio_irq_shutdown,
 };
 
 static struct __initconst of_device_id bcm_kona_gpio_of_match[] = {