linux-kernel - [PATCH RFC 3/8] thermal: thermal_of: Extend thermal dt driver to support bi-directional monitoring of a thermal trip point.

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Date:   Wed, 16 Sep 2020 23:22:21 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org, robh+dt@...nel.org,
        agross@...nel.org, bjorn.andersson@...aro.org
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        lukasz.luba@....com, amitk@...nel.org
Subject: [PATCH RFC 3/8] thermal: thermal_of: Extend thermal dt driver to support bi-directional monitoring of a thermal trip point.

Introduce of_thermal_get_trip_monitor_type to return the direction
of monitoring of a thermal trip point. Also translate the DT information
regarding trip point monitor direction into the thermal framework.

Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
---
 drivers/thermal/thermal_of.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 69ef12f852b7..5bc7f5bab772 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -328,6 +328,20 @@ static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
 	return 0;
 }
 
+static int of_thermal_get_trip_monitor_type
+				(struct thermal_zone_device *tz, int trip,
+				 enum thermal_trip_monitor_type *type)
+{
+	struct __thermal_zone *data = tz->devdata;
+
+	if (trip >= data->ntrips || trip < 0)
+		return -EDOM;
+
+	*type = data->trips[trip].monitor_type;
+
+	return 0;
+}
+
 static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
 				    int hyst)
 {
@@ -363,6 +377,7 @@ static struct thermal_zone_device_ops of_thermal_ops = {
 	.set_trip_temp = of_thermal_set_trip_temp,
 	.get_trip_hyst = of_thermal_get_trip_hyst,
 	.set_trip_hyst = of_thermal_set_trip_hyst,
+	.get_trip_mon_type = of_thermal_get_trip_monitor_type,
 	.get_crit_temp = of_thermal_get_crit_temp,
 
 	.bind = of_thermal_bind,
@@ -801,6 +816,7 @@ static int thermal_of_populate_trip(struct device_node *np,
 {
 	int prop;
 	int ret;
+	bool is_monitor_falling;
 
 	ret = of_property_read_u32(np, "temperature", &prop);
 	if (ret < 0) {
@@ -822,6 +838,12 @@ static int thermal_of_populate_trip(struct device_node *np,
 		return ret;
 	}
 
+	ret = of_property_read_bool(np, "monitor-falling");
+	if (is_monitor_falling)
+		trip->monitor_type = THERMAL_TRIP_MONITOR_FALLING;
+	else
+		trip->monitor_type = THERMAL_TRIP_MONITOR_RISING;
+
 	/* Required for cooling map matching */
 	trip->np = np;
 	of_node_get(np);
-- 
2.25.1