exynos-thermal.txt

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    1 * Exynos Thermal Management Unit (TMU)
    2 
    3 ** Required properties:
    4 
    5 - compatible : One of the following:
    6                "samsung,exynos3250-tmu"
    7                "samsung,exynos4412-tmu"
    8                "samsung,exynos4210-tmu"
    9                "samsung,exynos5250-tmu"
   10                "samsung,exynos5260-tmu"
   11                "samsung,exynos5420-tmu" for TMU channel 0, 1 on Exynos5420
   12                "samsung,exynos5420-tmu-ext-triminfo" for TMU channels 2, 3 and 4
   13                         Exynos5420 (Must pass triminfo base and triminfo clock)
   14                "samsung,exynos5433-tmu"
   15                "samsung,exynos7-tmu"
   16 - reg : Address range of the thermal registers. For soc's which has multiple
   17         instances of TMU and some registers are shared across all TMU's like
   18         interrupt related then 2 set of register has to supplied. First set
   19         belongs to register set of TMU instance and second set belongs to
   20         registers shared with the TMU instance.
   21 
   22   NOTE: On Exynos5420, the TRIMINFO register is misplaced for TMU
   23         channels 2, 3 and 4
   24         Use "samsung,exynos5420-tmu-ext-triminfo" in cases, there is a misplaced
   25         register, also provide clock to access that base.
   26 
   27         TRIMINFO at 0x1006c000 contains data for TMU channel 3
   28         TRIMINFO at 0x100a0000 contains data for TMU channel 4
   29         TRIMINFO at 0x10068000 contains data for TMU channel 2
   30 
   31 - interrupts : Should contain interrupt for thermal system
   32 - clocks : The main clocks for TMU device
   33         -- 1. operational clock for TMU channel
   34         -- 2. optional clock to access the shared registers of TMU channel
   35         -- 3. optional special clock for functional operation
   36 - clock-names : Thermal system clock name
   37         -- "tmu_apbif" operational clock for current TMU channel
   38         -- "tmu_triminfo_apbif" clock to access the shared triminfo register
   39                 for current TMU channel
   40         -- "tmu_sclk" clock for functional operation of the current TMU
   41                 channel
   42 
   43 The Exynos TMU supports generating interrupts when reaching given
   44 temperature thresholds. Number of supported thermal trip points depends
   45 on the SoC (only first trip points defined in DT will be configured):
   46  - most of SoC: 4
   47  - samsung,exynos5433-tmu: 8
   48  - samsung,exynos7-tmu: 8
   49 
   50 ** Optional properties:
   51 
   52 - vtmu-supply: This entry is optional and provides the regulator node supplying
   53                 voltage to TMU. If needed this entry can be placed inside
   54                 board/platform specific dts file.
   55 
   56 Example 1):
   57 
   58         tmu@100c0000 {
   59                 compatible = "samsung,exynos4412-tmu";
   60                 interrupt-parent = <&combiner>;
   61                 reg = <0x100C0000 0x100>;
   62                 interrupts = <2 4>;
   63                 clocks = <&clock 383>;
   64                 clock-names = "tmu_apbif";
   65                 vtmu-supply = <&tmu_regulator_node>;
   66                 #thermal-sensor-cells = <0>;
   67         };
   68 
   69 Example 2): (In case of Exynos5420 "with misplaced TRIMINFO register")
   70         tmu_cpu2: tmu@10068000 {
   71                 compatible = "samsung,exynos5420-tmu-ext-triminfo";
   72                 reg = <0x10068000 0x100>, <0x1006c000 0x4>;
   73                 interrupts = <0 184 0>;
   74                 clocks = <&clock 318>, <&clock 318>;
   75                 clock-names = "tmu_apbif", "tmu_triminfo_apbif";
   76                 #thermal-sensor-cells = <0>;
   77         };
   78 
   79         tmu_cpu3: tmu@1006c000 {
   80                 compatible = "samsung,exynos5420-tmu-ext-triminfo";
   81                 reg = <0x1006c000 0x100>, <0x100a0000 0x4>;
   82                 interrupts = <0 185 0>;
   83                 clocks = <&clock 318>, <&clock 319>;
   84                 clock-names = "tmu_apbif", "tmu_triminfo_apbif";
   85                 #thermal-sensor-cells = <0>;
   86         };
   87 
   88         tmu_gpu: tmu@100a0000 {
   89                 compatible = "samsung,exynos5420-tmu-ext-triminfo";
   90                 reg = <0x100a0000 0x100>, <0x10068000 0x4>;
   91                 interrupts = <0 215 0>;
   92                 clocks = <&clock 319>, <&clock 318>;
   93                 clock-names = "tmu_apbif", "tmu_triminfo_apbif";
   94                 #thermal-sensor-cells = <0>;
   95         };
   96 
   97 Note: For multi-instance tmu each instance should have an alias correctly
   98 numbered in "aliases" node.
   99 
  100 Example:
  101 
  102 aliases {
  103         tmuctrl0 = &tmuctrl_0;
  104         tmuctrl1 = &tmuctrl_1;
  105         tmuctrl2 = &tmuctrl_2;
  106 };

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