gpio: mxs: use enable/disable regs to (un)mask irqs

The mxs gpio controller does not only have a mask register to mask
interrupts, but also enable/disable registers. Use the enable/disable
registers rather than the mask register. This does not have any
advantage for now, but makes the next patch simpler.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mxs.c

@@ -211,12 +211,13 @@ static int __init mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
 
 	ct = gc->chip_types;
 	ct->chip.irq_ack = irq_gc_ack_set_bit;
-	ct->chip.irq_mask = irq_gc_mask_clr_bit;
-	ct->chip.irq_unmask = irq_gc_mask_set_bit;
+	ct->chip.irq_mask = irq_gc_mask_disable_reg;
+	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 	ct->chip.irq_set_type = mxs_gpio_set_irq_type;
 	ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
 	ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
-	ct->regs.mask = PINCTRL_IRQEN(port);
+	ct->regs.enable = PINCTRL_IRQEN(port) + MXS_SET;
+	ct->regs.disable = PINCTRL_IRQEN(port) + MXS_CLR;
 
 	irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK,
 			       IRQ_NOREQUEST, 0);