ddr: altera: Clean up rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase() part 7

Add kerneldoc, no functional change.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/ddr/altera/sequencer.c b/drivers/ddr/altera/sequencer.c
index 5f23777..6999504 100644
--- a/drivers/ddr/altera/sequencer.c
+++ b/drivers/ddr/altera/sequencer.c
@@ -1593,6 +1593,12 @@
 	return -EINVAL;
 }
 
+/**
+ * rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase() - Find a good DQS enable to use
+ * @grp:	Read/Write Group
+ *
+ * Find a good DQS enable to use.
+ */
 static int rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(const u32 grp)
 {
 	u32 d, p, i;