@@ -367,6 +367,10 @@ int subsys_virtual_register(struct bus_type *subsys,
* @dev_release: Called to release the device.
* @suspend: Used to put the device to sleep mode, usually to a low power
* state.
+ * @get_dependencies: Returns a list of struct fwnode_dependency containing
+ * the dependencies of the passed firmware node. The class is
+ * expected to inspect the firmware node and extract dependencies
+ * from its properties, based on bindings documentation.
* @resume: Used to bring the device from the sleep mode.
* @ns_type: Callbacks so sysfs can detemine namespaces.
* @namespace: Namespace of the device belongs to this class.
@@ -397,6 +401,8 @@ struct class {
int (*suspend)(struct device *dev, pm_message_t state);
int (*resume)(struct device *dev);
+ struct list_head *(*get_dependencies)(struct fwnode_handle *fwnode);
+
const struct kobj_ns_type_operations *ns_type;
const void *(*namespace)(struct device *dev);
@@ -24,4 +24,9 @@ struct fwnode_handle {
struct fwnode_handle *secondary;
};
+struct fwnode_dependency {
+ struct fwnode_handle *fwnode;
+ struct list_head dependency;
+};
+
#endif
Classes can implement this callback to provide a list of dependencies for a firmware node. These dependencies can be used to probe devices in order and to give proper warnings when dependencies cannot be fulfilled. This functionality is implemented in a class callback because subsystems implement the bindings that define how dependencies are expressed in the firmware. Adds struct fwnode_dependency, to be used to represent lists of dependencies of fwnodes. Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> --- include/linux/device.h | 6 ++++++ include/linux/fwnode.h | 5 +++++ 2 files changed, 11 insertions(+)