hw/irq: Add qemu_irq_split() so one GPIO output can feed two inputs

Add a qemu_irq_split() function which allows a board to wire a single
GPIO output up to two GPIO inputs. This is needed for realview boards,
where the MMC card status is visible both in a system register and
via a PL061 GPIO module.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/hw/irq.h b/hw/irq.h
index f7849ed..389ed7a 100644
--- a/hw/irq.h
+++ b/hw/irq.h
@@ -30,4 +30,7 @@ void qemu_free_irqs(qemu_irq *s);
 /* Returns a new IRQ with opposite polarity.  */
 qemu_irq qemu_irq_invert(qemu_irq irq);
 
+/* Returns a new IRQ which feeds into both the passed IRQs */
+qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2);
+
 #endif