Thread (39 messages) 39 messages, 5 authors, 2025-09-21

Re: [PATCH v2 04/25] platform: Add firmware-agnostic irq and affinity retrieval interface

From: Jonathan Cameron <jonathan.cameron@huawei.com>
Date: 2025-09-16 15:23:50
Also in: linux-acpi, lkml

On Mon, 15 Sep 2025 09:56:41 +0100
Marc Zyngier [off-list ref] wrote:
quoted hunk ↗ jump to hunk
Expand platform_get_irq_optional() to also return an affinity if
available, renaming it to platform_get_irq_affinity() in the
process.

platform_get_irq_optional() is preserved with its current semantics
by calling into the new helper with a NULL affinity pointer.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/base/platform.c         | 60 +++++++++++++++++++++++++++------
 include/linux/platform_device.h |  2 ++
 2 files changed, 52 insertions(+), 10 deletions(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 09450349cf323..fad33d6b2349a 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
 /**
- * platform_get_irq_optional - get an optional IRQ for a device
+ * platform_get_irq_affinity - get an optional IRQ and its affnity for a device
affinity
  * @dev: platform device
  * @num: IRQ number index
+ * @affinity: optional cpumask pointer to get the affinity of a per-cpu IRQ
  *
quoted hunk ↗ jump to hunk
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 074754c23d330..ad66333ce85ce 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -102,6 +102,8 @@ devm_platform_ioremap_resource_byname(struct platform_device *pdev,
 
 extern int platform_get_irq(struct platform_device *, unsigned int);
 extern int platform_get_irq_optional(struct platform_device *, unsigned int);
+extern int platform_get_irq_affinity(struct platform_device *, unsigned int,
+				     const struct cpumask **);
 extern int platform_irq_count(struct platform_device *);
 extern int devm_platform_get_irqs_affinity(struct platform_device *dev,
 					   struct irq_affinity *affd,
  
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