Commit 372a67c0 authored by Saravana Kannan's avatar Saravana Kannan Committed by Greg Kroah-Hartman
Browse files

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



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: default avatarSaravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20190904211126.47518-2-saravanak@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 54ecb8f7

drivers/base/core.c

+7 −0
Original line number Diff line number Diff line
@@ -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().

	 */

include/linux/fwnode.h

+2 −0
Original line number Diff line number Diff line
@@ -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

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