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driver core: platform: Add devm_platform_get_irqs_affinity()

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Drivers for multi-queue platform devices may also want managed interrupts
for handling HW queue completion interrupts, so add support.

The function accepts an affinity descriptor pointer, which covers all IRQs
expected for the device.

The function is devm class as the only current in-tree user will also use
devm method for requesting the interrupts; as such, the function is made
as devm as it can ensure ordering of freeing the irq and disposing of the
mapping.

Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1606905417-183214-5-git-send-email-john.garry@huawei.com
This commit is contained in:
John Garry 2020-12-02 18:36:56 +08:00 • committed by Marc Zyngier
parent 1c3f69b454
commit e15f2fa959
2 changed files with 127 additions and 0 deletions
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6
include/linux/platform_device.h
View file

@ -15,6 +15,7 @@
#define PLATFORM_DEVID_NONE (-1)
#define PLATFORM_DEVID_AUTO (-2)
struct irq_affinity;
struct mfd_cell;
struct property_entry;
struct platform_device_id;
@ -70,6 +71,11 @@ 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_irq_count(struct platform_device *);
extern int devm_platform_get_irqs_affinity(struct platform_device *dev,
struct irq_affinity *affd,
unsigned int minvec,
unsigned int maxvec,
int **irqs);
extern struct resource *platform_get_resource_byname(struct platform_device *,
unsigned int,
const char *);