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driver core: platform: Introduce platform_get_irq_optional() 

In some cases the interrupt line of a device is optional. Introduce a
new platform_get_irq_optional() that works much like platform_get_irq()
but does not output an error on failure to find the interrupt.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20190828083411.2496-1-thierry.reding@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Thierry Reding 2019-08-28 10:34:10 +02:00 committed by Greg Kroah-Hartman
parent bfb3943bed
commit 8973ea4790
2 changed files with 23 additions and 0 deletions
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22
drivers/base/platform.c
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@ -192,6 +192,28 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
}
EXPORT_SYMBOL_GPL(platform_get_irq);
/**
* platform_get_irq_optional - get an optional IRQ for a device
* @dev: platform device
* @num: IRQ number index
*
* 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.
*
* Example:
* int irq = platform_get_irq_optional(pdev, 0);
* if (irq < 0)
* return irq;
*
* Return: IRQ number on success, negative error number on failure.
*/
int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
{
return __platform_get_irq(dev, num);
}
/**
* platform_irq_count - Count the number of IRQs a platform device uses
* @dev: platform device

1
include/linux/platform_device.h
View File

@ -58,6 +58,7 @@ extern void __iomem *
devm_platform_ioremap_resource(struct platform_device *pdev,
unsigned int index);
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 struct resource *platform_get_resource_byname(struct platform_device *,
unsigned int,