From 2fd1db8819fbf73b5f74b4b4a205ab7be0957944 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Fri, 22 Mar 2013 09:23:03 -0300 Subject: thermal: dove: Fix thermal sensor formula 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 Signed-off-by: Ezequiel Garcia Acked-by: Andrew Lunn Signed-off-by: Zhang Rui --- drivers/thermal/dove_thermal.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/thermal/dove_thermal.c b/drivers/thermal/dove_thermal.c index 3078c403b42d..4b15a5f270dc 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; } -- cgit v1.2.1