[PATCH v4 03/26] of/irq: Add IRQ affinity reporting interface

Marc Zyngier
2025-10-20T12:30:10Z

Plug the irq_populate_fwspec_info() helper into the OF layer
to offer an IRQ affinity reporting function.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/of/irq.c | 20 ++++++++++++++++++++
include/linux/of_irq.h | 7 +++++++
2 files changed, 27 insertions(+)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 65c3c23255b74..168fde921bd27 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -479,6 +479,26 @@ int of_irq_get(struct device_node *dev, int index)
}
EXPORT_SYMBOL_GPL(of_irq_get);

+const struct cpumask *of_irq_get_affinity(struct device_node *dev, int index)
+{
+ struct of_phandle_args oirq;
+ struct irq_fwspec_info info;
+ struct irq_fwspec fwspec;
+ int rc;
+
+ rc = of_irq_parse_one(dev, index, &oirq);
+ if (rc)
+ return NULL;
+
+ of_phandle_args_to_fwspec(oirq.np, oirq.args, oirq.args_count,
+ &fwspec);
+
+ if (irq_populate_fwspec_info(&fwspec, &info))
+ return NULL;
+
+ return info.affinity;
+}
+
/**
* of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number
* @dev: pointer to device tree node
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index 1db8543dfc8a6..1c2bc02818071 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -43,6 +43,8 @@ extern int of_irq_parse_one(struct device_node *device, int index,
struct of_phandle_args *out_irq);
extern int of_irq_count(struct device_node *dev);
extern int of_irq_get(struct device_node *dev, int index);
+extern const struct cpumask *of_irq_get_affinity(struct device_node *dev,
+ int index);
extern int of_irq_get_byname(struct device_node *dev, const char *name);
extern int of_irq_to_resource_table(struct device_node *dev,
struct resource *res, int nr_irqs);
@@ -76,6 +78,11 @@ static inline int of_irq_get_byname(struct device_node *dev, const char *name)
{
return 0;
}
+static inline const struct cpumask *of_irq_get_affinity(struct device_node *dev,
+ int index)
+{
+ return NULL;
+}
static inline int of_irq_to_resource_table(struct device_node *dev,
struct resource *res, int nr_irqs)
{
--
2.47.3