[PATCH v3 5/6] thermal: of: Parse aggregation property to select the aggegration type

[Alexandre Bailon <abailon@xxxxxxxxxxxx>]

This updates the driver to parse the aggegration property in DT.
This allows selecting the aggregation function to apply for multi
sensors thermal zone.

Signed-off-by: Alexandre Bailon <abailon@xxxxxxxxxxxx>
---
 drivers/thermal/thermal_of.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 75e3cfb8488a..21c81dc91a41 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -533,6 +533,33 @@ static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 	thermal_zone_device_unregister(tz);
 }
 
+static const char * const aggr_types[] = {
+	[THERMAL_AGGR_AVG]	= "avg",
+	[THERMAL_AGGR_MAX]	= "max",
+};
+
+static int thermal_of_multi_sensor_get_type(struct device_node *np,
+					    enum thermal_aggregation_type *type)
+{
+	const char *t;
+	int err, i;
+
+	err = of_property_read_string(np, "aggregation", &t);
+	if (err < 0) {
+		*type = THERMAL_AGGR_AVG;
+		return 0;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(aggr_types); i++) {
+		if (!strcasecmp(t, aggr_types[i])) {
+			*type = i;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
 static int thermal_of_multi_sensor_validate_coeff(struct device_node *sensor, int id,
 						  struct device_node *tz_np)
 {
@@ -606,6 +633,7 @@ thermal_of_register_multi_tz(struct device_node *sensor, int id, struct device_n
 			     int polling_delay)
 {
 	struct thermal_zone_device *multi_tz, *tz;
+	enum thermal_aggregation_type aggr_type;
 	char name[THERMAL_NAME_LENGTH];
 	u32 coeff;
 	int ret;
@@ -614,6 +642,10 @@ thermal_of_register_multi_tz(struct device_node *sensor, int id, struct device_n
 	if (!multi_tz) {
 		struct thermal_zone_device_ops *multi_ops;
 
+		ret = thermal_of_multi_sensor_get_type(np, &aggr_type);
+		if (ret)
+			return ERR_PTR(ret);
+
 		ret = thermal_of_multi_sensor_validate_coeff(sensor, id, np);
 		if (ret)
 			return ERR_PTR(ret);
-- 
2.44.1