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device property: Introduce fwnode_find_reference() 

In most cases the references that the drivers look for don't
have any arguments. This introduces a wrapper function for
fwnode_property_get_reference_args() that looks for
references by using only the name and index.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
alistair/sunxi64-5.4-dsi
Heikki Krogerus 2019-05-31 17:15:39 +03:00 committed by Rafael J. Wysocki
parent ee48cef6c3
commit 83b34afb6b
2 changed files with 28 additions and 0 deletions
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24
drivers/base/property.c
View File

@ -484,6 +484,30 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
/**
* fwnode_find_reference - Find named reference to a fwnode_handle
* @fwnode: Firmware node where to look for the reference
* @name: The name of the reference
* @index: Index of the reference
*
* @index can be used when the named reference holds a table of references.
*
* Returns pointer to the reference fwnode, or ERR_PTR. Caller is responsible to
* call fwnode_handle_put() on the returned fwnode pointer.
*/
struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
const char *name,
unsigned int index)
{
struct fwnode_reference_args args;
int ret;
ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index,
&args);
return ret ? ERR_PTR(ret) : args.fwnode;
}
EXPORT_SYMBOL_GPL(fwnode_find_reference);
/**
* device_remove_properties - Remove properties from a device object.
* @dev: Device whose properties to remove.

4
include/linux/property.h
View File

@ -79,6 +79,10 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
unsigned int nargs, unsigned int index,
struct fwnode_reference_args *args);
struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
const char *name,
unsigned int index);
struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_next_parent(
struct fwnode_handle *fwnode);