[PATCH v8 10/10] OPP: Add support for setting interconnect-tags

[Georgi Djakov]

From: Sibi Sankar <sibis@xxxxxxxxxxxxxx>

Add support for setting tags on icc paths associated with
the opp_table.

Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
---
v8:
* New patch, picked from here:
  https://lore.kernel.org/r/20200504202243.5476-11-sibis@xxxxxxxxxxxxxx

 drivers/opp/of.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 3a64f2aa0f86..fd148d54022f 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -336,6 +336,7 @@ int _of_find_icc_paths(struct opp_table *opp_table, struct device *dev)
 {
 	struct device_node *np;
 	int ret, i, count, num_paths;
+	u32 tag;
 
 	np = of_node_get(dev->of_node);
 	if (!np)
@@ -344,20 +345,25 @@ int _of_find_icc_paths(struct opp_table *opp_table, struct device *dev)
 	count = of_count_phandle_with_args(np, "interconnects",
 					   "#interconnect-cells");
 	of_node_put(np);
-	if (count < 0)
-		return 0;
+	if (count < 0) {
+		ret = 0;
+		goto put_np;
+	}
 
 	/* two phandles when #interconnect-cells = <1> */
 	if (count % 2) {
 		dev_err(dev, "%s: Invalid interconnects values\n", __func__);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_np;
 	}
 
 	num_paths = count / 2;
 	opp_table->paths = kcalloc(num_paths, sizeof(*opp_table->paths),
 				   GFP_KERNEL);
-	if (!opp_table->paths)
-		return -ENOMEM;
+	if (!opp_table->paths) {
+		ret = -ENOMEM;
+		goto put_np;
+	}
 
 	for (i = 0; i < num_paths; i++) {
 		opp_table->paths[i] = of_icc_get_by_index(dev, i);
@@ -369,8 +375,14 @@ int _of_find_icc_paths(struct opp_table *opp_table, struct device *dev)
 			}
 			goto err;
 		}
+
+		/* Set tag if present */
+		if (!of_property_read_u32_index(np, "interconnect-tags",
+						i, &tag))
+			icc_set_tag(opp_table->paths[i], tag);
 	}
 	opp_table->path_count = num_paths;
+	of_node_put(np);
 
 	return 0;
 
@@ -380,6 +392,8 @@ int _of_find_icc_paths(struct opp_table *opp_table, struct device *dev)
 
 	kfree(opp_table->paths);
 	opp_table->paths = NULL;
+put_np:
+	of_node_put(np);
 
 	return ret;
 }