[PATCH] serial: 8250: add IRQ trigger support

[Vikram Pandita]

There is currently no provision for passing IRQ trigger flags for
serial IRQs with triggering requirements (such as GPIO IRQs.)

This patch adds UPF_IRQ_TRIG_* flags which map on to IRQF_TRIGGER_*
flags.

Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
Acked-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
---
 drivers/serial/8250.c       |   10 ++++++++++
 include/linux/serial_core.h |    4 ++++
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index bab115e..8235ef5 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1641,6 +1641,16 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
 	struct irq_info *i;
 	int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
 
+	/* Get IRQ Trigger Flag */
+	if (up->port.flags & UPF_IRQ_TRIG_RISING)
+		irq_flags |= IRQF_TRIGGER_RISING;
+	else if (up->port.flags & UPF_IRQ_TRIG_FALLING)
+		irq_flags |= IRQF_TRIGGER_FALLING;
+	else if (up->port.flags & UPF_IRQ_TRIG_HIGH)
+		irq_flags |= IRQF_TRIGGER_HIGH;
+	else if (up->port.flags & UPF_IRQ_TRIG_LOW)
+		irq_flags |= IRQF_TRIGGER_LOW;
+
 	mutex_lock(&hash_mutex);
 
 	h = &irq_lists[up->port.irq % NR_IRQ_HASH];
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 57a97e5..07591d5 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -296,7 +296,11 @@ struct uart_port {
 #define UPF_SPD_WARP		((__force upf_t) (0x1010))
 #define UPF_SKIP_TEST		((__force upf_t) (1 << 6))
 #define UPF_AUTO_IRQ		((__force upf_t) (1 << 7))
+#define UPF_IRQ_TRIG_RISING	((__force upf_t) (1 << 8))
+#define UPF_IRQ_TRIG_FALLING	((__force upf_t) (1 << 9))
+#define UPF_IRQ_TRIG_HIGH	((__force upf_t) (1 << 10))
 #define UPF_HARDPPS_CD		((__force upf_t) (1 << 11))
+#define UPF_IRQ_TRIG_LOW	((__force upf_t) (1 << 12))
 #define UPF_LOW_LATENCY		((__force upf_t) (1 << 13))
 #define UPF_BUGGY_UART		((__force upf_t) (1 << 14))
 #define UPF_NO_TXEN_TEST	((__force upf_t) (1 << 15))
-- 
1.6.0.3.613.g9f8f13

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