media: imx-mipi-csis: Add num_data_lanes to mipi_csis_device

Add the num_data_lanes field to the mipi_csis_device struct, and set it
equal to csis->bus.num_data_lanes. This is in preparation to support
cases when the data lanes actively used differs from the maximum
supported data lanes.

No functional changes intended by this commit.

Reviewed-by: Frank Li <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Isaac Scott <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/platform/nxp/imx-mipi-csis.c

···
 	u32 hs_settle;
 	u32 clk_settle;
 
+	unsigned int num_data_lanes;
+
 	spinlock_t slock;	/* Protect events */
 	struct mipi_csis_event events[MIPI_CSIS_NUM_EVENTS];
 	struct dentry *debugfs_root;
···
 	val = mipi_csis_read(csis, MIPI_CSIS_DPHY_CMN_CTRL);
 	val &= ~MIPI_CSIS_DPHY_CMN_CTRL_ENABLE;
 	if (on) {
-		mask = (1 << (csis->bus.num_data_lanes + 1)) - 1;
+		mask = (1 << (csis->num_data_lanes + 1)) - 1;
 		val |= (mask & MIPI_CSIS_DPHY_CMN_CTRL_ENABLE);
 	}
 	mipi_csis_write(csis, MIPI_CSIS_DPHY_CMN_CTRL, val);
···
 
 	/* Calculate the line rate from the pixel rate. */
 	link_freq = v4l2_get_link_freq(csis->source.pad, csis_fmt->width,
-				       csis->bus.num_data_lanes * 2);
+				       csis->num_data_lanes * 2);
 	if (link_freq < 0) {
 		dev_err(csis->dev, "Unable to obtain link frequency: %d\n",
 			(int)link_freq);
···
 				 const struct v4l2_mbus_framefmt *format,
 				 const struct csis_pix_format *csis_fmt)
 {
-	int lanes = csis->bus.num_data_lanes;
+	int lanes = csis->num_data_lanes;
 	u32 val;
 
 	val = mipi_csis_read(csis, MIPI_CSIS_CMN_CTRL);
···
 	}
 
 	csis->bus = vep.bus.mipi_csi2;
+	csis->num_data_lanes = csis->bus.num_data_lanes;
 
-	dev_dbg(csis->dev, "data lanes: %d\n", csis->bus.num_data_lanes);
+	dev_dbg(csis->dev, "max data lanes: %d\n", csis->bus.num_data_lanes);
 	dev_dbg(csis->dev, "flags: 0x%08x\n", csis->bus.flags);
 
 	asd = v4l2_async_nf_add_fwnode_remote(&csis->notifier, ep,