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device property: Add helper to match multiple connections 

In some cases multiple connections with the same connection id
needs to be resolved from a fwnode graph.

One such example is when separate hardware is used for performing muxing
and/or orientation switching of the SuperSpeed and SBU lines in a USB
Type-C connector. In this case the connector needs to belong to a graph
with multiple matching remote endpoints, and the Type-C controller needs
to be able to resolve them both.

Add a new API that allows this kind of lookup.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220422222351.1297276-2-bjorn.andersson@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjorn Andersson 2022-04-22 15:23:45 -07:00 committed by Greg Kroah-Hartman
parent 3c16251153
commit 7a20917d30
2 changed files with 114 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

109
drivers/base/property.c
View File

@ -1218,6 +1218,40 @@ fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
return NULL;
}
static unsigned int fwnode_graph_devcon_matches(struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match,
void **matches,
unsigned int matches_len)
{
struct fwnode_handle *node;
struct fwnode_handle *ep;
unsigned int count = 0;
void *ret;
fwnode_graph_for_each_endpoint(fwnode, ep) {
if (matches && count >= matches_len) {
fwnode_handle_put(ep);
break;
}
node = fwnode_graph_get_remote_port_parent(ep);
if (!fwnode_device_is_available(node)) {
fwnode_handle_put(node);
continue;
}
ret = match(node, con_id, data);
fwnode_handle_put(node);
if (ret) {
if (matches)
matches[count] = ret;
count++;
}
}
return count;
}
static void *
fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
void *data, devcon_match_fn_t match)
@ -1240,6 +1274,37 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
return NULL;
}
static unsigned int fwnode_devcon_matches(struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match,
void **matches,
unsigned int matches_len)
{
struct fwnode_handle *node;
unsigned int count = 0;
unsigned int i;
void *ret;
for (i = 0; ; i++) {
if (matches && count >= matches_len)
break;
node = fwnode_find_reference(fwnode, con_id, i);
if (IS_ERR(node))
break;
ret = match(node, NULL, data);
fwnode_handle_put(node);
if (ret) {
if (matches)
matches[count] = ret;
count++;
}
}
return count;
}
/**
* fwnode_connection_find_match - Find connection from a device node
* @fwnode: Device node with the connection
@ -1267,3 +1332,47 @@ void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
return fwnode_devcon_match(fwnode, con_id, data, match);
}
EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
/**
* fwnode_connection_find_matches - Find connections 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
* @matches: (Optional) array of pointers to fill with matches
* @matches_len: Length of @matches
*
* Find up to @matches_len connections with unique identifier @con_id between
* @fwnode and other device nodes. @match will be used to convert the
* connection description to data the caller is expecting to be returned
* through the @matches array.
* If @matches is NULL @matches_len is ignored and the total number of resolved
* matches is returned.
*
* Return: Number of matches resolved, or negative errno.
*/
int fwnode_connection_find_matches(struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match,
void **matches, unsigned int matches_len)
{
unsigned int count_graph;
unsigned int count_ref;
if (!fwnode || !match)
return -EINVAL;
count_graph = fwnode_graph_devcon_matches(fwnode, con_id, data, match,
matches, matches_len);
if (matches) {
matches += count_graph;
matches_len -= count_graph;
}
count_ref = fwnode_devcon_matches(fwnode, con_id, data, match,
matches, matches_len);
return count_graph + count_ref;
}
EXPORT_SYMBOL_GPL(fwnode_connection_find_matches);

5
include/linux/property.h
View File

@ -447,6 +447,11 @@ static inline void *device_connection_find_match(struct device *dev,
return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
}
int fwnode_connection_find_matches(struct fwnode_handle *fwnode,
const char *con_id, void *data,
devcon_match_fn_t match,
void **matches, unsigned int matches_len);
/* -------------------------------------------------------------------------- */
/* Software fwnode support - when HW description is incomplete or missing */