gpio: 104-idio-16: Disable IRQ on device probe

IRQ should be disabled on device probe so that the device IRQ is in a
known starting state. If IRQ is not disabled, interrupts may be reported
as handled by the IRQ handler, despite no irq_unmask calls made by the
user.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-104-idio-16.c

@@ -242,6 +242,9 @@ static int __init idio_16_probe(struct platform_device *pdev)
 		goto err_gpio_register;
 	}
 
+	/* Disable IRQ by default */
+	outb(0, base + 2);
+
 	err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
 		handle_edge_irq, IRQ_TYPE_NONE);
 	if (err) {