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device connection: Add fwnode_connection_find_match()

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The fwnode_connection_find_match() function is exactly the
same as device_connection_find_match(), except it takes
struct fwnode_handle as parameter instead of struct device.
That allows locating device connections before the device
entries have been created.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1567070558-29417-7-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-08-29 17:22:33 +08:00 committed by Greg Kroah-Hartman
parent 977607653c
commit 44493062ab
2 changed files with 38 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
drivers/base/devcon.c
View file

@ -12,9 +12,6 @@
static DEFINE_MUTEX(devcon_lock);
static LIST_HEAD(devcon_list);
typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
void *data);
static void *
fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
void *data, devcon_match_fn_t match)
@ -60,6 +57,34 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
return NULL;
}
/**
* fwnode_connection_find_match - Find connection from a device node
* @fwnode: Device node with the connection
* @con_id: Identifier for the connection
* @data: Data for the match function
* @match: Function to check and convert the connection description
*
* Find a connection with unique identifier @con_id between @fwnode and another
* device node. @match will be used to convert the connection description to
* data the caller is expecting to be returned.
*/
void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match)
{
void *ret;
if (!fwnode || !match)
return NULL;
ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
if (ret)
return ret;
return fwnode_devcon_match(fwnode, con_id, data, match);
}
EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
/**
* device_connection_find_match - Find physical connection to a device
* @dev: Device with the connection
@ -83,15 +108,9 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
if (!match)
return NULL;
if (fwnode) {
ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
if (ret)
return ret;
ret = fwnode_devcon_match(fwnode, con_id, data, match);
if (ret)
return ret;
}
ret = fwnode_connection_find_match(fwnode, con_id, data, match);
if (ret)
return ret;
mutex_lock(&devcon_lock);

10
include/linux/device.h
View file

@ -781,10 +781,14 @@ struct device_connection {
struct list_head list;
};
typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
void *data);
void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match);
void *device_connection_find_match(struct device *dev, const char *con_id,
void *data,
void *(*match)(struct device_connection *con,
int ep, void *data));
void *data, devcon_match_fn_t match);
struct device *device_connection_find(struct device *dev, const char *con_id);