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authorSakari Ailus <sakari.ailus@linux.intel.com>2017-07-21 15:11:49 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-07-22 01:04:51 +0300
commit3e3119d3088f41106f3581d39e7694a50ca3fc02 (patch)
treeb7215757dd95eda454860929de50319ca5f5d432 /include/linux/fwnode.h
parent37ba983cfb47cc7b353146422c437468fcb29c61 (diff)
downloadlinux-3e3119d3088f41106f3581d39e7694a50ca3fc02.tar.xz
device property: Introduce fwnode_property_get_reference_args
The new fwnode_property_get_reference_args() interface amends the fwnode property API with the functionality of both of_parse_phandle_with_args() and __acpi_node_get_property_reference(). The semantics is slightly different: the cells property is ignored on ACPI as the number of arguments can be explicitly obtained from the firmware interface. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/fwnode.h')
-rw-r--r--include/linux/fwnode.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 7b50ee4edcfc..0c35b6caf0f6 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -33,6 +33,20 @@ struct fwnode_endpoint {
const struct fwnode_handle *local_fwnode;
};
+#define NR_FWNODE_REFERENCE_ARGS 8
+
+/**
+ * struct fwnode_reference_args - Fwnode reference with additional arguments
+ * @fwnode:- A reference to the base fwnode
+ * @nargs: Number of elements in @args array
+ * @args: Integer arguments on the fwnode
+ */
+struct fwnode_reference_args {
+ struct fwnode_handle *fwnode;
+ unsigned int nargs;
+ unsigned int args[NR_FWNODE_REFERENCE_ARGS];
+};
+
/**
* struct fwnode_operations - Operations for fwnode interface
* @get: Get a reference to an fwnode.
@@ -46,6 +60,7 @@ struct fwnode_endpoint {
* @get_parent: Return the parent of an fwnode.
* @get_next_child_node: Return the next child node in an iteration.
* @get_named_child_node: Return a child node with a given name.
+ * @get_reference_args: Return a reference pointed to by a property, with args
* @graph_get_next_endpoint: Return an endpoint node in an iteration.
* @graph_get_remote_endpoint: Return the remote endpoint node of a local
* endpoint node.
@@ -73,6 +88,10 @@ struct fwnode_operations {
struct fwnode_handle *
(*get_named_child_node)(const struct fwnode_handle *fwnode,
const char *name);
+ int (*get_reference_args)(const struct fwnode_handle *fwnode,
+ const char *prop, const char *nargs_prop,
+ unsigned int nargs, unsigned int index,
+ struct fwnode_reference_args *args);
struct fwnode_handle *
(*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
struct fwnode_handle *prev);