In order to be able to reference an irqdomain from ACPI, we need
to be able to create an identifier, which is a struct device_node.
This device node does't really fit the ACPI infrastructure, so
we cunningly hide it by returning the contained fwnode_handle.
This will help a (still hypothetical) further migration of
irqdomain from device_node to fwnode_handle.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
include/linux/irqdomain.h | 2 ++
kernel/irq/irqdomain.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index d3ca792..3193c61 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -162,6 +162,8 @@ enum {
};
#ifdef CONFIG_IRQ_DOMAIN
+struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
+void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
irq_hw_number_t hwirq_max, int direct_max,
const struct irq_domain_ops *ops,
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index e5c1e4c..5e7214a 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -29,6 +29,36 @@ static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
static void irq_domain_check_hierarchy(struct irq_domain *domain);
/**
+ * irq_domain_alloc_fwnode - Allocate a OF-backed fwnode_handle suitable for
+ * identifying an irq domain
+ * @data: optional user-provided data
+ *
+ * Allocate a struct device_node, and return a poiner to the embedded
+ * fwnode_handle (or NULL on failure).
+ */
+struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
+{
+ struct device_node *of_node;
+
+ of_node = of_node_alloc("irqdomain@%p", data);
+ if (!of_node)
+ return NULL;
+
+ of_node->data = data;
+ return &of_node->fwnode;
+}
+
+/**
+ * irq_domain_free_fwnode - Free a OF-backed fwnode_handle
+ *
+ * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
+ */
+void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
+{
+ of_node_put(to_of_node(fwnode));
+}
+
+/**
* __irq_domain_add() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller
* @size: Size of linear map; 0 for radix mapping only
--
2.1.4
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