driver-api/thermal/exynos_thermal.rst

15 ---------------------------
17 This driver allows to read temperature inside Samsung Exynos4/5 series of SoC.
19 The chip only exposes the measured 8-bit temperature code value
21 Temperature can be taken from the temperature code.
22 There are three equations converting from temperature to temperature code.
27 	Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1
31 	Tc = T + TI1 - 25
38        Temperature code, T: Temperature,
40        Trimming info for 25 degree Celsius (stored at TRIMINFO register)
41        Temperature code measured at 25 degree Celsius which is unchanged
43        Trimming info for 85 degree Celsius (stored at TRIMINFO register)
44        Temperature code measured at 85 degree Celsius which is unchanged
47 when temperature exceeds pre-defined levels.
48 The maximum number of configurable threshold is five.
49 The threshold levels are defined as follows::
51   Level_0: current temperature > trigger_level_0 + threshold
52   Level_1: current temperature > trigger_level_1 + threshold
53   Level_2: current temperature > trigger_level_2 + threshold
54   Level_3: current temperature > trigger_level_3 + threshold
56 The threshold and each trigger_level are set
65 -----------------------
74   TMU configuration data -----> TMU Driver  <----> Exynos Core thermal wrapper