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driver core: Add fwnode_to_dev() to look up device from fwnode

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It's often useful to look up a device that corresponds to a fwnode. So
add an API to do that irrespective of the bus on which the device has
been added to.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20190904211126.47518-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan 2019-09-04 14:11:20 -07:00 committed by Greg Kroah-Hartman
parent 54ecb8f702
commit 372a67c0c5
2 changed files with 9 additions and 0 deletions
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7
drivers/base/core.c
View File

@ -2198,6 +2198,10 @@ int device_add(struct device *dev)
BUS_NOTIFY_ADD_DEVICE, dev);
kobject_uevent(&dev->kobj, KOBJ_ADD);
if (dev->fwnode && !dev->fwnode->dev)
dev->fwnode->dev = dev;
bus_probe_device(dev);
if (parent)
klist_add_tail(&dev->p->knode_parent,
@ -2342,6 +2346,9 @@ void device_del(struct device *dev)
kill_device(dev);
device_unlock(dev);
if (dev->fwnode && dev->fwnode->dev == dev)
dev->fwnode->dev = NULL;
/* Notify clients of device removal. This call must come
* before dpm_sysfs_remove().
*/

2
include/linux/fwnode.h
View File

@ -17,6 +17,7 @@ struct device;
struct fwnode_handle {
struct fwnode_handle *secondary;
const struct fwnode_operations *ops;
struct device *dev;
};
/**
@ -123,5 +124,6 @@ struct fwnode_operations {
if (fwnode_has_op(fwnode, op)) \
(fwnode)->ops->op(fwnode, ## __VA_ARGS__); \
} while (false)
#define get_dev_from_fwnode(fwnode) get_device((fwnode)->dev)
#endif