thermal/of: Initialize trip points separately

Self contain the trip initialization from the device tree in a single
function for the sake of making the code flow more clear.

Cc: Alexandre Bailon <abailon@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linexp.org>
Link: https://lore.kernel.org/r/20220722200007.1839356-11-daniel.lezcano@linexp.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/thermal/thermal_of.c

@@ -693,7 +693,8 @@ static int of_find_trip_id(struct device_node *np, struct device_node *trip)
  *
  * Return: 0 on success, proper error code otherwise
  */
-static int thermal_of_populate_bind_params(struct device_node *np,
+static int thermal_of_populate_bind_params(struct device_node *tz_np,
+					   struct device_node *np,
 					   struct __thermal_bind_params *__tbp)
 {
 	struct of_phandle_args cooling_spec;
@@ -715,7 +716,7 @@ static int thermal_of_populate_bind_params(struct device_node *np,
 		return -ENODEV;
 	}
 
-	trip_id = of_find_trip_id(np, trip);
+	trip_id = of_find_trip_id(tz_np, trip);
 	if (trip_id < 0) {
 		ret = trip_id;
 		goto end;
@@ -849,6 +850,53 @@ static int thermal_of_populate_trip(struct device_node *np,
 	return 0;
 }
 
+static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *ntrips)
+{
+	struct thermal_trip *tt;
+	struct device_node *trips, *trip;
+	int ret, count;
+
+	trips = of_get_child_by_name(np, "trips");
+	if (!trips) {
+		pr_err("Failed to find 'trips' node\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	count = of_get_child_count(trips);
+	if (!count) {
+		pr_err("No trip point defined\n");
+		ret = -EINVAL;
+		goto out_of_node_put;
+	}
+
+	tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL);
+	if (!tt) {
+		ret = -ENOMEM;
+		goto out_of_node_put;
+	}
+
+	*ntrips = count;
+
+	count = 0;
+	for_each_child_of_node(trips, trip) {
+		ret = thermal_of_populate_trip(trip, &tt[count++]);
+		if (ret)
+			goto out_kfree;
+	}
+
+	of_node_put(trips);
+
+	return tt;
+
+out_kfree:
+	kfree(tt);
+	*ntrips = 0;
+out_of_node_put:
+	of_node_put(trips);
+
+	return ERR_PTR(ret);
+}
+
 /**
  * thermal_of_build_thermal_zone - parse and fill one thermal zone data
  * @np: DT node containing a thermal zone node
@@ -867,7 +915,6 @@ static struct __thermal_zone
 __init *thermal_of_build_thermal_zone(struct device_node *np)
 {
 	struct device_node *child = NULL, *gchild;
-	struct device_node *trips;
 	struct __thermal_zone *tz;
 	int ret, i;
 	u32 prop, coef[2];
@@ -909,28 +956,10 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
 		tz->offset = 0;
 	}
 
-	/* trips */
-	trips = of_get_child_by_name(np, "trips");
-
-	/* No trips provided */
-	if (!trips)
+	tz->trips = thermal_of_trips_init(np, &tz->ntrips);
+	if (IS_ERR(tz->trips)) {
+		ret = PTR_ERR(tz->trips);
 		goto finish;
-
-	tz->ntrips = of_get_child_count(trips);
-	if (tz->ntrips == 0) /* must have at least one child */
-		goto finish;
-
-	tz->trips = kcalloc(tz->ntrips, sizeof(*tz->trips), GFP_KERNEL);
-	if (!tz->trips) {
-		ret = -ENOMEM;
-		goto free_tz;
-	}
-
-	i = 0;
-	for_each_child_of_node(trips, gchild) {
-		ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
-		if (ret)
-			goto free_trips;
 	}
 
 	/* cooling-maps */
@@ -952,13 +981,14 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
 
 	i = 0;
 	for_each_child_of_node(child, gchild) {
-		ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++]);
-		if (ret)
+		ret = thermal_of_populate_bind_params(np, gchild, &tz->tbps[i++]);
+		if (ret) {
+			of_node_put(gchild);
 			goto free_tbps;
+		}
 	}
 
 finish:
-	of_node_put(trips);
 	of_node_put(child);
 
 	return tz;
@@ -977,8 +1007,6 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
 	kfree(tz->tbps);
 free_trips:
 	kfree(tz->trips);
-	of_node_put(trips);
-	of_node_put(gchild);
 free_tz:
 	kfree(tz);
 	of_node_put(child);