[PATCH v3 12/37] MIPS: JZ4740: parse SoC interrupt controller parent IRQ from DT

[Paul Burton <paul.burton@xxxxxxxxxx>]

Rather than hardcoding the IRQ number used to cascade interrupts from
the SoC interrupt controller to the CPU interrupt controller, read that
IRQ number from the DT describing the system.

Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
---
Changes in v3:
  - New patch.
---
 arch/mips/jz4740/irq.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/mips/jz4740/irq.c b/arch/mips/jz4740/irq.c
index 43e000a..ed51915 100644
--- a/arch/mips/jz4740/irq.c
+++ b/arch/mips/jz4740/irq.c
@@ -85,6 +85,11 @@ static int __init jz4740_intc_of_init(struct device_node *node,
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
+	int parent_irq;
+
+	parent_irq = irq_of_parse_and_map(node, 0);
+	if (!parent_irq)
+		return -EINVAL;
 
 	jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14);
 
@@ -108,7 +113,7 @@ static int __init jz4740_intc_of_init(struct device_node *node,
 
 	irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0, IRQ_NOPROBE | IRQ_LEVEL);
 
-	setup_irq(2, &jz4740_cascade_action);
+	setup_irq(parent_irq, &jz4740_cascade_action);
 	return 0;
 }
 IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", jz4740_intc_of_init);
-- 
2.3.5