serial: 8250: add IRQ trigger support

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

This patch adds irqflags to plat_serial8250_port that can be passed
from board file to reqest_irq() of 8250 driver

Changes are backward compatible with boards passing UPF_SHARE_IRQ flag

Tested on Zoom2 board that has IRQF_TRIGGER_RISING requirement for 8250 irq

[Moved new flag to end to fix bugs in the original with the old_serial array
	-- Alan]

Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index d4d2a78ad43e..fb46aba11fb5 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -22,6 +22,7 @@ struct plat_serial8250_port {
         void __iomem    *membase;       /* ioremap cookie or NULL */
         resource_size_t mapbase;        /* resource base */
         unsigned int    irq;            /* interrupt number */
+        unsigned long   irqflags;       /* request_irq flags */
         unsigned int    uartclk;        /* UART clock rate */
         void            *private_data;
         unsigned char   regshift;       /* register shift */
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 23d2fb051f97..3cd255f0b211 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -265,6 +265,7 @@ struct uart_port {
         unsigned int            (*serial_in)(struct uart_port *, int);
         void                    (*serial_out)(struct uart_port *, int, int);
         unsigned int            irq;                    /* irq number */
+        unsigned long           irqflags;               /* irq flags  */
         unsigned int            uartclk;                /* base uart clock */
         unsigned int            fifosize;               /* tx fifo size */
         unsigned char           x_char;                 /* xon/xoff char */