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

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Date: Fri, 24 May 2024 16:31:49 +0200
From: Alexandre Bailon <abailon@...libre.com>
To: rafael@...nel.org,
	daniel.lezcano@...aro.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: rui.zhang@...el.com,
	lukasz.luba@....com,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexandre Bailon <abailon@...libre.com>
Subject: [PATCH v3 5/6] thermal: of: Parse aggregation property to select the aggegration type

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@...libre.com>
---
 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