irqchip/mmp: Coexist with GIC root IRQ controller

On MMP3, the GIC can be set as a root IRQ interrupt controller. If the
device tree indicated that GIC is enabled, avoid hooking up
mmp2_handle_irq().

The interrupt muxes are still being used.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20190822092643.593488-10-lkundrak@v3.sk

diff --git a/drivers/irqchip/irq-mmp.c b/drivers/irqchip/irq-mmp.c
index da290d8..4a74ac7 100644 (file)
--- a/drivers/irqchip/irq-mmp.c
+++ b/drivers/irqchip/irq-mmp.c
@@ -468,7 +468,12 @@ static int __init mmp3_of_init(struct device_node *node,
        icu_data[0].conf_disable = mmp3_conf.conf_disable;
        icu_data[0].conf_mask = mmp3_conf.conf_mask;
        icu_data[0].conf2_mask = mmp3_conf.conf2_mask;
-       set_handle_irq(mmp2_handle_irq);
+
+       if (!parent) {
+               /* This is the main interrupt controller. */
+               set_handle_irq(mmp2_handle_irq);
+       }
+
        max_icu_nr = 1;
        return 0;
 }