qdev: allow multiple qdev_init_gpio_in() calls

Allow multiple qdev_init_gpio_in() calls for the one device. The first call will
define GPIOs 0-N-1, the next GPIOs N- ... . Allows different GPIOs to be handled
with different handlers. Needed when two levels of the QOM class heirachy both
define GPIO functionality, as a single GPIO handler with an index selecter is
not possible.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/hw/irq.h b/hw/irq.h
index 56c55f0c46..e640c105e7 100644
--- a/hw/irq.h
+++ b/hw/irq.h
@@ -23,8 +23,17 @@ static inline void qemu_irq_pulse(qemu_irq irq)
     qemu_set_irq(irq, 0);
 }
 
-/* Returns an array of N IRQs.  */
+/* Returns an array of N IRQs. Each IRQ is assigned the argument handler and
+ * opaque data.
+ */
 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n);
+
+/* Extends an Array of IRQs. Old IRQs have their handlers and opaque data
+ * preserved. New IRQs are assigned the argument handler and opaque data.
+ */
+qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
+                                void *opaque, int n);
+
 void qemu_free_irqs(qemu_irq *s);
 
 /* Returns a new IRQ with opposite polarity.  */