Commit ca0acb51 authored by Akhil R's avatar Akhil R Committed by Wolfram Sang
Browse files

device property: Add fwnode_irq_get_byname 



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: default avatarAkhil R <akhilrajeev@nvidia.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@kernel.org>
parent e783362e

drivers/base/property.c

+29 −0
Original line number Diff line number Diff line
@@ -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

include/linux/property.h

+1 −0
Original line number Diff line number Diff line
@@ -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);