thermal/drivers/u8500: Remove the get_trend function

The get_trend function relies on the interrupt to set the raising or
dropping trend. However the interpolated temperature is already giving
the temperature information to the thermal framework which is able to
deduce the trend.

Remove the trend code.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220616202537.303655-3-daniel.lezcano@linaro.orgSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/thermal/db8500_thermal.c

@@ -53,7 +53,6 @@ static const unsigned long db8500_thermal_points[] = {
 
 struct db8500_thermal_zone {
 	struct thermal_zone_device *tz;
-	enum thermal_trend trend;
 	unsigned long interpolated_temp;
 	unsigned int cur_index;
 };
@@ -73,24 +72,12 @@ static int db8500_thermal_get_temp(void *data, int *temp)
 	return 0;
 }
 
-/* Callback to get temperature changing trend */
-static int db8500_thermal_get_trend(void *data, int trip, enum thermal_trend *trend)
-{
-	struct db8500_thermal_zone *th = data;
-
-	*trend = th->trend;
-
-	return 0;
-}
-
 static struct thermal_zone_of_device_ops thdev_ops = {
 	.get_temp = db8500_thermal_get_temp,
-	.get_trend = db8500_thermal_get_trend,
 };
 
 static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
 					 unsigned int idx,
-					 enum thermal_trend trend,
 					 unsigned long next_low,
 					 unsigned long next_high)
 {
@@ -98,7 +85,6 @@ static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
 
 	th->cur_index = idx;
 	th->interpolated_temp = (next_low + next_high)/2;
-	th->trend = trend;
 
 	/*
 	 * The PRCMU accept absolute temperatures in celsius so divide
@@ -127,8 +113,7 @@ static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
 	}
 	idx -= 1;
 
-	db8500_thermal_update_config(th, idx, THERMAL_TREND_DROPPING,
-				     next_low, next_high);
+	db8500_thermal_update_config(th, idx, next_low, next_high);
 	dev_dbg(&th->tz->device,
 		"PRCMU set max %ld, min %ld\n", next_high, next_low);
 
@@ -149,8 +134,7 @@ static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
 		next_low = db8500_thermal_points[idx];
 		idx += 1;
 
-		db8500_thermal_update_config(th, idx, THERMAL_TREND_RAISING,
-					     next_low, next_high);
+		db8500_thermal_update_config(th, idx, next_low, next_high);
 
 		dev_dbg(&th->tz->device,
 			"PRCMU set max %ld, min %ld\n", next_high, next_low);
@@ -210,8 +194,7 @@ static int db8500_thermal_probe(struct platform_device *pdev)
 	dev_info(dev, "thermal zone sensor registered\n");
 
 	/* Start measuring at the lowest point */
-	db8500_thermal_update_config(th, 0, THERMAL_TREND_STABLE,
-				     PRCMU_DEFAULT_LOW_TEMP,
+	db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
 				     db8500_thermal_points[0]);
 
 	platform_set_drvdata(pdev, th);
@@ -232,8 +215,7 @@ static int db8500_thermal_resume(struct platform_device *pdev)
 	struct db8500_thermal_zone *th = platform_get_drvdata(pdev);
 
 	/* Resume and start measuring at the lowest point */
-	db8500_thermal_update_config(th, 0, THERMAL_TREND_STABLE,
-				     PRCMU_DEFAULT_LOW_TEMP,
+	db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
 				     db8500_thermal_points[0]);
 
 	return 0;