[PATCH 1/2] irqdomain: support three-cell scheme interrupts

[Yixun Lan <dlan@xxxxxxxxxx>]

The is a prerequisite patch to support parsing three-cell
interrupts which encoded as <instance hwirq irqflag>,
the translate function will always retrieve irq number and
flag from last two cells.

Signed-off-by: Yixun Lan <dlan@xxxxxxxxxx>
---
 kernel/irq/irqdomain.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index ec6d8e72d980f604ded2bfa2143420e0e0095920..cb874ab5e54a4763d601122becd63b6d759e55d2 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1208,10 +1208,17 @@ int irq_domain_translate_twocell(struct irq_domain *d,
 				 unsigned long *out_hwirq,
 				 unsigned int *out_type)
 {
+	u32 irq, type;
+
 	if (WARN_ON(fwspec->param_count < 2))
 		return -EINVAL;
-	*out_hwirq = fwspec->param[0];
-	*out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+	irq = fwspec->param_count - 2;
+	type = fwspec->param_count - 1;
+
+	*out_hwirq = fwspec->param[irq];
+	*out_type = fwspec->param[type] & IRQ_TYPE_SENSE_MASK;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);

-- 
2.48.1