net: mscc: ocelot: debugging print for statistics regions

To make it easier to debug future issues with statistics counters not
getting aggregated properly into regions, like what happened in commit
6acc72a4 ("net: mscc: ocelot: fix stats region batching"), add some
dev_dbg() prints which show the regions that were dynamically
determined.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mscc/ocelot_stats.c

@@ -925,6 +925,15 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 	}
 
 	list_for_each_entry(region, &ocelot->stats_regions, node) {
+		enum ocelot_target target;
+		u32 addr;
+
+		ocelot_reg_to_target_addr(ocelot, region->base, &target,
+					  &addr);
+
+		dev_dbg(ocelot->dev,
+			"region of %d contiguous counters starting with SYS:STAT:CNT[0x%03x]\n",
+			region->count, addr / 4);
 		region->buf = devm_kcalloc(ocelot->dev, region->count,
 					   sizeof(*region->buf), GFP_KERNEL);
 		if (!region->buf)