[PATCH v4 3/9] genirq/irqdomain: Add a fwnode_handle allocator
From: Marc Zyngier <hidden>
Date: 2015-09-28 16:45:55
Also in:
linux-acpi, linux-devicetree, lkml
Subsystem:
irq domains (irq number mapping library), irq subsystem, the rest · Maintainers:
Thomas Gleixner, Linus Torvalds
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 <redacted> --- 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