usb: roles: Find the muxes by also matching against the device node

When the connections are defined in firmware, struct
device_connection will have the fwnode member pointing to
the device node (struct fwnode_handle) of the requested
device, and the endpoint will not be used at all in that
case.

Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Tested-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 99116af..f45d8df 100644 (file)
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/usb/role.h>
+#include <linux/property.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -84,7 +85,12 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
 
-static int __switch_match(struct device *dev, const void *name)
+static int switch_fwnode_match(struct device *dev, const void *fwnode)
+{
+       return dev_fwnode(dev) == fwnode;
+}
+
+static int switch_name_match(struct device *dev, const void *name)
 {
        return !strcmp((const char *)name, dev_name(dev));
 }
@@ -94,8 +100,16 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
 {
        struct device *dev;
 
-       dev = class_find_device(role_class, NULL, con->endpoint[ep],
-                               __switch_match);
+       if (con->fwnode) {
+               if (!fwnode_property_present(con->fwnode, con->id))
+                       return NULL;
+
+               dev = class_find_device(role_class, NULL, con->fwnode,
+                                       switch_fwnode_match);
+       } else {
+               dev = class_find_device(role_class, NULL, con->endpoint[ep],
+                                       switch_name_match);
+       }
 
        return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
 }
@@ -266,6 +280,7 @@ usb_role_switch_register(struct device *parent,
        sw->get = desc->get;
 
        sw->dev.parent = parent;
+       sw->dev.fwnode = desc->fwnode;
        sw->dev.class = role_class;
        sw->dev.type = &usb_role_dev_type;
        dev_set_name(&sw->dev, "%s-role-switch", dev_name(parent));

diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index edc51be..c05ffa6 100644 (file)
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -18,6 +18,7 @@ typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev);
 
 /**
  * struct usb_role_switch_desc - USB Role Switch Descriptor
+ * @fwnode: The device node to be associated with the role switch
  * @usb2_port: Optional reference to the host controller port device (USB2)
  * @usb3_port: Optional reference to the host controller port device (USB3)
  * @udc: Optional reference to the peripheral controller device
@@ -32,6 +33,7 @@ typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev);
  * usb_role_switch_register() before registering the switch.
  */
 struct usb_role_switch_desc {
+       struct fwnode_handle *fwnode;
        struct device *usb2_port;
        struct device *usb3_port;
        struct device *udc;