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Diffstat (limited to 'Documentation/thermal/exynos_thermal')
| -rw-r--r-- | Documentation/thermal/exynos_thermal | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/Documentation/thermal/exynos_thermal b/Documentation/thermal/exynos_thermal deleted file mode 100644 index 2b46f67b1ccb..000000000000 --- a/Documentation/thermal/exynos_thermal +++ /dev/null @@ -1,52 +0,0 @@ -Kernel driver exynos4_tmu -================= - -Supported chips: -* ARM SAMSUNG EXYNOS4 series of SoC - Prefix: 'exynos4-tmu' - Datasheet: Not publicly available - -Authors: Donggeun Kim <dg77.kim@samsung.com> - -Description ------------ - -This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC. - -The chip only exposes the measured 8-bit temperature code value -through a register. -Temperature can be taken from the temperature code. -There are three equations converting from temperature to temperature code. - -The three equations are: - 1. Two point trimming - Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1 - - 2. One point trimming - Tc = T + TI1 - 25 - - 3. No trimming - Tc = T + 50 - - Tc: Temperature code, T: Temperature, - TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO register) - Temperature code measured at 25 degree Celsius which is unchanged - TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register) - Temperature code measured at 85 degree Celsius which is unchanged - -TMU(Thermal Management Unit) in EXYNOS4 generates interrupt -when temperature exceeds pre-defined levels. -The maximum number of configurable threshold is four. -The threshold levels are defined as follows: - Level_0: current temperature > trigger_level_0 + threshold - Level_1: current temperature > trigger_level_1 + threshold - Level_2: current temperature > trigger_level_2 + threshold - Level_3: current temperature > trigger_level_3 + threshold - - The threshold and each trigger_level are set - through the corresponding registers. - -When an interrupt occurs, this driver notify kernel thermal framework -with the function exynos4_report_trigger. -Although an interrupt condition for level_0 can be set, -it can be used to synchronize the cooling action. |