1 Exynos Thermal management Unit 2 3 Required properties: 4 5 - compatible : Should be "samsung,exynos-tmu" for TMU 6 - samsung,min-temp : Minimum temperature value (25 degree celsius) 7 - Current temperature of SoC should be more than this value. 8 - samsung,max-temp : Maximum temperature value (125 degree celsius) 9 - Current temperature of SoC should be less than this value. 10 - samsung,start-warning : Temperature at which TMU starts giving warning (degree celsius) 11 - samsung,start-tripping : Temperature at which TMU shuts down the system (degree celsius) 12 - samsung,hw-tripping : Temperature at which hardware tripping should happen 13 in case TMU fails to power off (degree celsius) 14 - samsung,efuse-min-value : SOC efuse min value (Constant 40) 15 - efuse-value should be more than this value. 16 - samsung,efuse-value : SOC actual efuse value (Literal value) 17 - This is the data trimming info. 18 - This value is used to calculate measuring error. 19 - samsung,efuse-max-value : SoC max efuse value (Constant 100) 20 - efuse-value should be less than this value. 21 - samsung,slope : Default value 274761730 (Constant 0x1060_8802). 22 - This is the default value for TMU_CONTROL register. 23 - It sets the gain of amplifier to the positive-tc generator block. 24 - It selects thermal tripping mode and enables thermal tripping. 25 - samsung,dc-value : Measured data calibration value (Constant 25) 26 - Used for tempearture calculation. 27 - This is 25 because temperature measured is always above 25 degrees. 28 29 30 Example: 31 32 tmu@10060000 { 33 compatible = "samsung,exynos-tmu" 34 samsung,min-temp = <25>; 35 samsung,max-temp = <125>; 36 samsung,start-warning = <95>; 37 samsung,start-tripping = <105>; 38 samsung,hw-tripping = <110>; 39 samsung,efuse-min-value = <40>; 40 samsung,efuse-value = <55>; 41 samsung,efuse-max-value = <100>; 42 samsung,slope = <274761730>; 43 samsung,dc-value = <25>; 44 }; 45
