[PATCH 07/13] driver-core: Add class.get_dependencies() callback
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STALE4104d
From: Tomeu Vizoso <hidden>
Date: 2015-06-17 13:43:45
Also in:
lkml
Subsystem:
acpi, driver core, kobjects, debugfs and sysfs, software nodes and device properties, the rest · Maintainers:
"Rafael J. Wysocki", Greg Kroah-Hartman, Danilo Krummrich, Linus Torvalds
Revision v1 of 2 in this series.
Revisions (2)
- v1 current
- v2 [diff vs current]
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 <redacted> --- include/linux/device.h | 6 ++++++ include/linux/fwnode.h | 5 +++++ 2 files changed, 11 insertions(+)
diff --git a/include/linux/device.h b/include/linux/device.h
index 5a31bf3..c52f290 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h@@ -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);
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 0408545..68ab558 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h@@ -24,4 +24,9 @@ struct fwnode_handle { struct fwnode_handle *secondary; }; +struct fwnode_dependency { + struct fwnode_handle *fwnode; + struct list_head dependency; +}; + #endif
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2.4.1