[PATCH 2/2] thermal: dove: Fix thermal sensor formula

[Ezequiel Garcia]

The currently formula has been taken from the 88AP510 SoC datasheet,
which is not exactly correct. The correct value for the temperature
in Celcius of the sensor present in this SoC is:

  Celsius = (322-reg)/1.3625

Signed-off-by: Lior Amsalem <alior at marvell.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia at free-electrons.com>
---
Tested by compilation only.

 drivers/thermal/dove_thermal.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/dove_thermal.c b/drivers/thermal/dove_thermal.c
index 7b0bfa0..ddd73a5 100644
--- a/drivers/thermal/dove_thermal.c
+++ b/drivers/thermal/dove_thermal.c
@@ -107,12 +107,13 @@ static int dove_get_temp(struct thermal_zone_device *thermal,
 	}
 
 	/*
-	 * Calculate temperature. See Section 8.10.1 of 88AP510,
-	 * Documentation/arm/Marvell/README
+	 * Calculate temperature. According to Marvell internal
+	 * documentation the formula for this is:
+	 * Celsius = (322-reg)/1.3625
 	 */
 	reg = readl_relaxed(priv->sensor);
 	reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
-	*temp = ((2281638UL - (7298*reg)) / 10);
+	*temp = ((3220000000UL - (10000000UL * reg)) / 13625);
 
 	return 0;
 }
-- 
1.7.8.6