diff mbox series

[v12,01/10] device property: Add remote endpoint to devcon matcher

Message ID 20230221095054.1868277-2-treapking@chromium.org (mailing list archive)
State New, archived
Headers show
Series Register Type-C mode-switch in DP bridge endpoints | expand

Commit Message

Pin-yen Lin Feb. 21, 2023, 9:50 a.m. UTC 
From: Prashant Malani <pmalani@chromium.org>

When searching the device graph for device matches, check the
remote-endpoint itself for a match.

Some drivers register devices for individual endpoints. This allows
the matcher code to evaluate those for a match too, instead
of only looking at the remote parent devices. This is required when a
device supports two mode switches in its endpoints, so we can't simply
register the mode switch with the parent node.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Pin-yen Lin <treapking@chromium.org>

---

Changes in v12:
- Check the availability of the device node in fwnode_graph_devcon_matches
- Ensured valid access to "matches" in fwnode_graph_devcon_matches
- Updated the documentation in fwnode_connection_find_match(es)
- Dropped collected tags due to the new changes

Changes in v11:
- Added missing fwnode_handle_put in drivers/base/property.c

Changes in v10:
- Collected Reviewed-by and Tested-by tags

Changes in v6:
- New in v6

 drivers/base/property.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

Comments

Andy Shevchenko Feb. 21, 2023, 11:26 a.m. UTC | #1 
On Tue, Feb 21, 2023 at 05:50:45PM +0800, Pin-yen Lin wrote:
> From: Prashant Malani <pmalani@chromium.org>
> 
> When searching the device graph for device matches, check the
> remote-endpoint itself for a match.
> 
> Some drivers register devices for individual endpoints. This allows
> the matcher code to evaluate those for a match too, instead
> of only looking at the remote parent devices. This is required when a
> device supports two mode switches in its endpoints, so we can't simply
> register the mode switch with the parent node.

...

>   * @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.
> + * device node. For fwnode graph connections, the graph endpoints are also
> + * checked. @match will be used to convert the connection description to data
> + * the caller is expecting to be returned.
>   */

Please add a Return: section at the end of the kernel doc.
Otherwise it complains that there is none.

...

>   * @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.
> + * @fwnode and other device nodes. For fwnode graph connections, the graph
> + * endpoints are also checked. @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.

Ditto.
diff mbox series

Patch

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 083a95791d3b..45f7f40eb5fa 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1243,6 +1243,23 @@  static unsigned int fwnode_graph_devcon_matches(const struct fwnode_handle *fwno
 			continue;
 		}
 
+		ret = match(node, con_id, data);
+		fwnode_handle_put(node);
+		if (ret) {
+			if (matches)
+				matches[count] = ret;
+			count++;
+
+			if (matches && count >= matches_len)
+				break;
+		}
+
+		/*
+		 * Some drivers may register devices for endpoints. Check
+		 * the remote-endpoints for matches in addition to the remote
+		 * port parent.
+		 */
+		node = fwnode_graph_get_remote_endpoint(ep);
 		ret = match(node, con_id, data);
 		fwnode_handle_put(node);
 		if (ret) {
@@ -1293,8 +1310,9 @@  static unsigned int fwnode_devcon_matches(const struct fwnode_handle *fwnode,
  * @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.
+ * device node. For fwnode graph connections, the graph endpoints are also
+ * checked. @match will be used to convert the connection description to data
+ * the caller is expecting to be returned.
  */
 void *fwnode_connection_find_match(const struct fwnode_handle *fwnode,
 				   const char *con_id, void *data,
@@ -1325,9 +1343,10 @@  EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
  * @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.
+ * @fwnode and other device nodes. For fwnode graph connections, the graph
+ * endpoints are also checked. @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.
  *