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platform: Add firmware-agnostic irq and affinity retrieval interface 

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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Will Deacon <will@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20251020122944.3074811-5-maz@kernel.org
This commit is contained in:
Marc Zyngier 2025-10-20 13:29:21 +01:00 committed by Thomas Gleixner
parent 5404f5c06d
commit 0d5daa938c
2 changed files with 58 additions and 15 deletions
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69
drivers/base/platform.c
View File

@ -150,25 +150,37 @@ devm_platform_ioremap_resource_byname(struct platform_device *pdev,
EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
#endif /* CONFIG_HAS_IOMEM */
static const struct cpumask *get_irq_affinity(struct platform_device *dev,
unsigned int num)
{
const struct cpumask *mask = NULL;
#ifndef CONFIG_SPARC
struct fwnode_handle *fwnode = dev_fwnode(&dev->dev);
if (is_of_node(fwnode))
mask = of_irq_get_affinity(to_of_node(fwnode), num);
else if (is_acpi_device_node(fwnode))
mask = acpi_irq_get_affinity(ACPI_HANDLE_FWNODE(fwnode), num);
#endif
return mask ?: cpu_possible_mask;
}
/**
* platform_get_irq_optional - get an optional IRQ for a device
* platform_get_irq_affinity - get an optional IRQ and its affinity for a device
* @dev: platform device
* @num: IRQ number index
* @num: interrupt number index
* @affinity: optional cpumask pointer to get the affinity of a per-cpu interrupt
*
* Gets an IRQ for a platform device. Device drivers should check the return
* value for errors so as to not pass a negative integer value to the
* request_irq() APIs. This is the same as platform_get_irq(), except that it
* does not print an error message if an IRQ can not be obtained.
* Gets an interupt for a platform device. Device drivers should check the
* return value for errors so as to not pass a negative integer value to
* the request_irq() APIs. Optional affinity information is provided in the
* affinity pointer if available, and NULL otherwise.
*
* For example::
*
* int irq = platform_get_irq_optional(pdev, 0);
* if (irq < 0)
* return irq;
*
* Return: non-zero IRQ number on success, negative error number on failure.
* Return: non-zero interrupt number on success, negative error number on failure.
*/
int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
int platform_get_irq_affinity(struct platform_device *dev, unsigned int num,
const struct cpumask **affinity)
{
int ret;
#ifdef CONFIG_SPARC
@ -236,8 +248,37 @@ int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
out:
if (WARN(!ret, "0 is an invalid IRQ number\n"))
return -EINVAL;
if (ret > 0 && affinity)
*affinity = get_irq_affinity(dev, num);
return ret;
}
EXPORT_SYMBOL_GPL(platform_get_irq_affinity);
/**
* platform_get_irq_optional - get an optional interrupt for a device
* @dev: platform device
* @num: interrupt number index
*
* Gets an interrupt for a platform device. Device drivers should check the
* return value for errors so as to not pass a negative integer value to
* the request_irq() APIs. This is the same as platform_get_irq(), except
* that it does not print an error message if an interrupt can not be
* obtained.
*
* For example::
*
* int irq = platform_get_irq_optional(pdev, 0);
* if (irq < 0)
* return irq;
*
* Return: non-zero interrupt number on success, negative error number on failure.
*/
int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
{
return platform_get_irq_affinity(dev, num, NULL);
}
EXPORT_SYMBOL_GPL(platform_get_irq_optional);
/**

2
include/linux/platform_device.h
View File

@ -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,