pinctrl: ocelot: Fix GPIO interrupt decoding on Jaguar2

This fixes a problem with using the GPIO as an interrupt on Jaguar2
(and similar), as the register layout of the platforms with 64 GPIO's
are pairwise, such that the original offset must be multiplied with
the platform stride.

Fixes: da801ab5 pinctrl: ocelot: add MSCC Jaguar2 support.
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Link: https://lore.kernel.org/r/20200513125532.24585-4-lars.povlsen@microchip.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-ocelot.c

@@ -680,11 +680,12 @@ static void ocelot_irq_handler(struct irq_desc *desc)
 	struct irq_chip *parent_chip = irq_desc_get_chip(desc);
 	struct gpio_chip *chip = irq_desc_get_handler_data(desc);
 	struct ocelot_pinctrl *info = gpiochip_get_data(chip);
+	unsigned int id_reg = OCELOT_GPIO_INTR_IDENT * info->stride;
 	unsigned int reg = 0, irq, i;
 	unsigned long irqs;
 
 	for (i = 0; i < info->stride; i++) {
-		regmap_read(info->map, OCELOT_GPIO_INTR_IDENT + 4 * i, &reg);
+		regmap_read(info->map, id_reg + 4 * i, &reg);
 		if (!reg)
 			continue;