arm/imx: fix irq_base for gpio

When gpio core dynamically allocate gpio number for a port, it starts
from the end of the total range, 0 ~ ARCH_NR_GPIOS.  That said, the
earlier a port gets probed, the bigger gpio number it gets assigned.
To match this, the irq_base for gpio should be assigned from
'MXC_GPIO_IRQ_START + ARCH_NR_GPIOS' decreasingly.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/arm/mach-mx5/imx53-dt.c b/arch/arm/mach-mx5/imx53-dt.c
index 022bc0364b5f..85bfd5ff21b0 100644
--- a/arch/arm/mach-mx5/imx53-dt.c
+++ b/arch/arm/mach-mx5/imx53-dt.c
@@ -58,11 +58,10 @@ static int __init imx53_tzic_add_irq_domain(struct device_node *np,
 static int __init imx53_gpio_add_irq_domain(struct device_node *np,
                                 struct device_node *interrupt_parent)
 {
-        static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS -
-                                   32 * 7; /* imx53 gets 7 gpio ports */
+        static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
 
+        gpio_irq_base -= 32;
         irq_domain_add_simple(np, gpio_irq_base);
-        gpio_irq_base += 32;
 
         return 0;
 }