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     1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/cpufreq/cpufreq-mediatek-hw.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: MediaTek's CPUFREQ Bindings
    8 
    9 maintainers:
   10   - Hector Yuan <hector.yuan@mediatek.com>
   11 
   12 description:
   13   CPUFREQ HW is a hardware engine used by MediaTek SoCs to
   14   manage frequency in hardware. It is capable of controlling
   15   frequency for multiple clusters.
   16 
   17 properties:
   18   compatible:
   19     const: mediatek,cpufreq-hw
   20 
   21   reg:
   22     minItems: 1
   23     maxItems: 2
   24     description:
   25       Addresses and sizes for the memory of the HW bases in
   26       each frequency domain. Each entry corresponds to
   27       a register bank for each frequency domain present.
   28 
   29   "#performance-domain-cells":
   30     description:
   31       Number of cells in a performance domain specifier.
   32       Set const to 1 here for nodes providing multiple
   33       performance domains.
   34     const: 1
   35 
   36 required:
   37   - compatible
   38   - reg
   39   - "#performance-domain-cells"
   40 
   41 additionalProperties: false
   42 
   43 examples:
   44   - |
   45     cpus {
   46             #address-cells = <1>;
   47             #size-cells = <0>;
   48 
   49             cpu0: cpu@0 {
   50                 device_type = "cpu";
   51                 compatible = "arm,cortex-a55";
   52                 enable-method = "psci";
   53                 performance-domains = <&performance 0>;
   54                 reg = <0x000>;
   55             };
   56     };
   57 
   58     /* ... */
   59 
   60     soc {
   61         #address-cells = <2>;
   62         #size-cells = <2>;
   63 
   64         performance: performance-controller@11bc00 {
   65             compatible = "mediatek,cpufreq-hw";
   66             reg = <0 0x0011bc10 0 0x120>, <0 0x0011bd30 0 0x120>;
   67 
   68             #performance-domain-cells = <1>;
   69         };
   70     };
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