of/irq: Use the msi-map property to provide device-specific MSI domain
While msi-parent is used to point to the MSI controller that
works for all the devices behind a root complex, it doesn't
allow configurations where each individual device can be routed
to a separate MSI controller.
The msi-map property provides this flexibility (and much more),
so let's add a utility function that parses it, and return the
corresponding MSI domain.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index 62ae6ed..65d9692 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -49,6 +49,8 @@
extern struct irq_domain *of_msi_get_domain(struct device *dev,
struct device_node *np,
enum irq_domain_bus_token token);
+extern struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
+ u32 rid);
#else
static inline int of_irq_count(struct device_node *dev)
{
@@ -73,6 +75,11 @@
{
return NULL;
}
+static inline struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
+ u32 rid)
+{
+ return NULL;
+}
#endif
#if defined(CONFIG_OF)