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device property: Add fwnode_irq_get_byname

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Add fwnode_irq_get_byname() to get an interrupt by name from either
ACPI table or Device Tree, whichever is used for enumeration.

In the ACPI case, this allow us to use 'interrupt-names' in
_DSD which can be mapped to Interrupt() resource by index.
The implementation is similar to 'interrupt-names' in the
Device Tree.

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Akhil R 2022-01-28 17:14:25 +05:30 committed by Wolfram Sang
parent e783362eb5
commit ca0acb511c
2 changed files with 30 additions and 0 deletions
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29
drivers/base/property.c
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@ -935,6 +935,35 @@ void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
}
EXPORT_SYMBOL(fwnode_iomap);
/**
* fwnode_irq_get_byname - Get IRQ from a fwnode using its name
* @fwnode: Pointer to the firmware node
* @name: IRQ name
*
* Description:
* Find a match to the string @name in the 'interrupt-names' string array
* in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
* number of the IRQ resource corresponding to the index of the matched
* string.
*
* Return:
* Linux IRQ number on success, or negative errno otherwise.
*/
int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
{
int index;
if (!name)
return -EINVAL;
index = fwnode_property_match_string(fwnode, "interrupt-names", name);
if (index < 0)
return index;
return fwnode_irq_get(fwnode, index);
}
EXPORT_SYMBOL(fwnode_irq_get_byname);
/**
* fwnode_graph_get_next_endpoint - Get next endpoint firmware node
* @fwnode: Pointer to the parent firmware node

1
include/linux/property.h
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@ -121,6 +121,7 @@ struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
void fwnode_handle_put(struct fwnode_handle *fwnode);
int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);