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driver core: Add fwnode link support

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Add support for creating supplier-consumer links between fwnodes.  It is
intended for internal use the driver core and generic firmware support
code (eg. Device Tree, ACPI), so it is simple by design and the API
provided is limited.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20201121020232.908850-9-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan
2020-11-20 18:02:23 -08:00
committed by Greg Kroah-Hartman
parent 01bb86b380
commit 7b337cb3eb
3 changed files with 113 additions and 0 deletions
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14
include/linux/fwnode.h
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@@ -10,6 +10,7 @@
#define _LINUX_FWNODE_H_
#include <linux/types.h>
#include <linux/list.h>
struct fwnode_operations;
struct device;
@@ -18,6 +19,15 @@ struct fwnode_handle {
struct fwnode_handle *secondary;
const struct fwnode_operations *ops;
struct device *dev;
struct list_head suppliers;
struct list_head consumers;
};
struct fwnode_link {
struct fwnode_handle *supplier;
struct list_head s_hook;
struct fwnode_handle *consumer;
struct list_head c_hook;
};
/**
@@ -174,8 +184,12 @@ static inline void fwnode_init(struct fwnode_handle *fwnode,
const struct fwnode_operations *ops)
{
fwnode->ops = ops;
INIT_LIST_HEAD(&fwnode->consumers);
INIT_LIST_HEAD(&fwnode->suppliers);
}
extern u32 fw_devlink_get_flags(void);
int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
void fwnode_links_purge(struct fwnode_handle *fwnode);
#endif