media: v4l2-fwnode: The first default data lane is 0 on C-PHY

C-PHY has no clock lanes. Therefore the first data lane is 0 by default.

Fixes: edc6d56c ("media: v4l: fwnode: Support parsing of CSI-2 C-PHY endpoints")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/v4l2-core/v4l2-fwnode.c

@@ -229,6 +229,10 @@ static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
 	if (bus_type == V4L2_MBUS_CSI2_DPHY ||
 	    bus_type == V4L2_MBUS_CSI2_CPHY || lanes_used ||
 	    have_clk_lane || (flags & ~V4L2_MBUS_CSI2_CONTINUOUS_CLOCK)) {
+		/* Only D-PHY has a clock lane. */
+		unsigned int dfl_data_lane_index =
+			bus_type == V4L2_MBUS_CSI2_DPHY;
+
 		bus->flags = flags;
 		if (bus_type == V4L2_MBUS_UNKNOWN)
 			vep->bus_type = V4L2_MBUS_CSI2_DPHY;
@@ -237,7 +241,7 @@ static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
 		if (use_default_lane_mapping) {
 			bus->clock_lane = 0;
 			for (i = 0; i < num_data_lanes; i++)
-				bus->data_lanes[i] = 1 + i;
+				bus->data_lanes[i] = dfl_data_lane_index + i;
 		} else {
 			bus->clock_lane = clock_lane;
 			for (i = 0; i < num_data_lanes; i++)