diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/typec/mux.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c index 603f3e698cc0..664fb3513f48 100644 --- a/drivers/usb/typec/mux.c +++ b/drivers/usb/typec/mux.c @@ -30,6 +30,22 @@ static void *typec_switch_match(struct fwnode_handle *fwnode, const char *id, { struct device *dev; + /* + * Device graph (OF graph) does not give any means to identify the + * device type or the device class of the remote port parent that @fwnode + * represents, so in order to identify the type or the class of @fwnode + * an additional device property is needed. With typec switches the + * property is named "orientation-switch" (@id). The value of the device + * property is ignored. + */ + if (id && !fwnode_property_present(fwnode, id)) + return NULL; + + /* + * At this point we are sure that @fwnode is a typec switch in all + * cases. If the switch hasn't yet been registered for some reason, the + * function "defers probe" for now. + */ dev = class_find_device(&typec_mux_class, NULL, fwnode, switch_fwnode_match); |