[net-next: PATCH v4 5/8] device property: introduce fwnode_find_parent_dev_match
From: Marcin Wojtas <hidden>
Date: 2023-01-16 17:53:45
Also in:
linux-acpi, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, software nodes and device properties, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
Add a new generic routine fwnode_find_parent_dev_match that can be used e.g. as a callback for class_find_device(). It searches for the struct device corresponding to a struct fwnode_handle by iterating over device and its parents. Signed-off-by: Marcin Wojtas <redacted> --- include/linux/property.h | 1 + drivers/base/property.c | 23 ++++++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/include/linux/property.h b/include/linux/property.h
index 37179e3abad5..4ae20d7c5103 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h@@ -109,6 +109,7 @@ struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode); unsigned int fwnode_count_parents(const struct fwnode_handle *fwn); struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn, unsigned int depth); +int fwnode_find_parent_dev_match(struct device *dev, const void *data); bool fwnode_is_ancestor_of(struct fwnode_handle *ancestor, struct fwnode_handle *child); struct fwnode_handle *fwnode_get_next_child_node( const struct fwnode_handle *fwnode, struct fwnode_handle *child);
diff --git a/drivers/base/property.c b/drivers/base/property.c
index bbb3e499ff4a..84849d4934cc 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c@@ -693,6 +693,29 @@ struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode, } EXPORT_SYMBOL_GPL(fwnode_get_nth_parent); +/** + * fwnode_find_parent_dev_match - look for a device matching the struct fwnode_handle + * @dev: the struct device to initiate the search + * @data: pointer passed for comparison + * + * Looks up the device structure corresponding with the fwnode by iterating + * over @dev and its parents. + * The routine can be used e.g. as a callback for class_find_device(). + * + * Returns: %1 - match is found + * %0 - match not found + */ +int fwnode_find_parent_dev_match(struct device *dev, const void *data) +{ + for (; dev; dev = dev->parent) { + if (device_match_fwnode(dev, data)) + return 1; + } + + return 0; +} +EXPORT_SYMBOL_GPL(fwnode_find_parent_dev_match); + /** * fwnode_is_ancestor_of - Test if @ancestor is ancestor of @child * @ancestor: Firmware which is tested for being an ancestor
--
2.29.0