[RFT][PATCH 2/2] irqchip: vt8500: Support 'rising and falling edge' trigger mode

[Axel Lin <axel.lin@ingics.com>]

This chip supports below interrupt request trigger mode:

Destination Control Register:
BIT[5:4] Interrupt Request Trigger Mode.
        00: High level trigger
        01: Posedge trigger
        10: Negedge trigger
        11: Both posedge and negedge trigger

This patch adds support for setting 'posedge and negedge trigger' mode.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
---
Current code does not correctly handle the case if a driver request irq with
"IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING" flag.
I'm not sure if we have such use case in current code.

 drivers/irqchip/irq-vt8500.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/irqchip/irq-vt8500.c b/drivers/irqchip/irq-vt8500.c
index eb6d05a..e040994 100644
--- a/drivers/irqchip/irq-vt8500.c
+++ b/drivers/irqchip/irq-vt8500.c
@@ -136,6 +136,10 @@ static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
 		dctr |= VT8500_TRIGGER_RISING;
 		__irq_set_handler_locked(d->irq, handle_edge_irq);
 		break;
+	case IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING:
+		dctr |= VT8500_EDGE;
+		__irq_set_handler_locked(d->irq, handle_edge_irq);
+		break;
 	}
 	writeb(dctr, base + VT8500_ICDC + d->hwirq);
 
-- 
1.8.1.2