device connection: Prepare support for firmware described connections

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. The endpoint member for the device names 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>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index d427e806cd73..858b8d2f6ef8 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -75,12 +75,36 @@ static struct bus_type *generic_match_buses[] = {
         NULL,
 };
 
+static int device_fwnode_match(struct device *dev, void *fwnode)
+{
+        return dev_fwnode(dev) == fwnode;
+}
+
+static void *device_connection_fwnode_match(struct device_connection *con)
+{
+        struct bus_type *bus;
+        struct device *dev;
+
+        for (bus = generic_match_buses[0]; bus; bus++) {
+                dev = bus_find_device(bus, NULL, (void *)con->fwnode,
+                                      device_fwnode_match);
+                if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
+                        return dev;
+
+                put_device(dev);
+        }
+        return NULL;
+}
+
 /* This tries to find the device from the most common bus types by name. */
 static void *generic_match(struct device_connection *con, int ep, void *data)
 {
         struct bus_type *bus;
         struct device *dev;
 
+        if (con->fwnode)
+                return device_connection_fwnode_match(con);
+
         for (bus = generic_match_buses[0]; bus; bus++) {
                 dev = bus_find_device_by_name(bus, NULL, con->endpoint[ep]);
                 if (dev)