mediatek,cci.yaml

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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/interconnect/mediatek,cci.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: MediaTek Cache Coherent Interconnect (CCI) frequency and voltage scaling
    8 
    9 maintainers:
   10   - Jia-Wei Chang <jia-wei.chang@mediatek.com>
   11   - Johnson Wang <johnson.wang@mediatek.com>
   12 
   13 description: |
   14   MediaTek Cache Coherent Interconnect (CCI) is a hardware engine used by
   15   MT8183 and MT8186 SoCs to scale the frequency and adjust the voltage in
   16   hardware. It can also optimize the voltage to reduce the power consumption.
   17 
   18 properties:
   19   compatible:
   20     enum:
   21       - mediatek,mt8183-cci
   22       - mediatek,mt8186-cci
   23 
   24   clocks:
   25     items:
   26       - description:
   27           The multiplexer for clock input of the bus.
   28       - description:
   29           A parent of "bus" clock which is used as an intermediate clock source
   30           when the original clock source (PLL) is under transition and not
   31           stable yet.
   32 
   33   clock-names:
   34     items:
   35       - const: cci
   36       - const: intermediate
   37 
   38   operating-points-v2: true
   39   opp-table: true
   40 
   41   proc-supply:
   42     description:
   43       Phandle of the regulator for CCI that provides the supply voltage.
   44 
   45   sram-supply:
   46     description:
   47       Phandle of the regulator for sram of CCI that provides the supply
   48       voltage. When it is present, the implementation needs to do
   49       "voltage tracking" to step by step scale up/down Vproc and Vsram to fit
   50       SoC specific needs. When absent, the voltage scaling flow is handled by
   51       hardware, hence no software "voltage tracking" is needed.
   52 
   53 required:
   54   - compatible
   55   - clocks
   56   - clock-names
   57   - operating-points-v2
   58   - proc-supply
   59 
   60 additionalProperties: false
   61 
   62 examples:
   63   - |
   64     #include <dt-bindings/clock/mt8183-clk.h>
   65     cci: cci {
   66         compatible = "mediatek,mt8183-cci";
   67         clocks = <&mcucfg CLK_MCU_BUS_SEL>,
   68                  <&topckgen CLK_TOP_ARMPLL_DIV_PLL1>;
   69         clock-names = "cci", "intermediate";
   70         operating-points-v2 = <&cci_opp>;
   71         proc-supply = <&mt6358_vproc12_reg>;
   72     };
   73 
   74     cci_opp: opp-table-cci {
   75         compatible = "operating-points-v2";
   76         opp-shared;
   77         opp2_00: opp-273000000 {
   78             opp-hz = /bits/ 64 <273000000>;
   79             opp-microvolt = <650000>;
   80         };
   81         opp2_01: opp-338000000 {
   82             opp-hz = /bits/ 64 <338000000>;
   83             opp-microvolt = <687500>;
   84         };
   85         opp2_02: opp-403000000 {
   86             opp-hz = /bits/ 64 <403000000>;
   87             opp-microvolt = <718750>;
   88         };
   89         opp2_03: opp-463000000 {
   90             opp-hz = /bits/ 64 <463000000>;
   91             opp-microvolt = <756250>;
   92         };
   93         opp2_04: opp-546000000 {
   94             opp-hz = /bits/ 64 <546000000>;
   95             opp-microvolt = <800000>;
   96         };
   97         opp2_05: opp-624000000 {
   98             opp-hz = /bits/ 64 <624000000>;
   99             opp-microvolt = <818750>;
  100         };
  101         opp2_06: opp-689000000 {
  102             opp-hz = /bits/ 64 <689000000>;
  103             opp-microvolt = <850000>;
  104         };
  105         opp2_07: opp-767000000 {
  106             opp-hz = /bits/ 64 <767000000>;
  107             opp-microvolt = <868750>;
  108         };
  109         opp2_08: opp-845000000 {
  110             opp-hz = /bits/ 64 <845000000>;
  111             opp-microvolt = <893750>;
  112         };
  113         opp2_09: opp-871000000 {
  114             opp-hz = /bits/ 64 <871000000>;
  115             opp-microvolt = <906250>;
  116         };
  117         opp2_10: opp-923000000 {
  118             opp-hz = /bits/ 64 <923000000>;
  119             opp-microvolt = <931250>;
  120         };
  121         opp2_11: opp-962000000 {
  122             opp-hz = /bits/ 64 <962000000>;
  123             opp-microvolt = <943750>;
  124         };
  125         opp2_12: opp-1027000000 {
  126             opp-hz = /bits/ 64 <1027000000>;
  127             opp-microvolt = <975000>;
  128         };
  129         opp2_13: opp-1092000000 {
  130             opp-hz = /bits/ 64 <1092000000>;
  131             opp-microvolt = <1000000>;
  132         };
  133         opp2_14: opp-1144000000 {
  134             opp-hz = /bits/ 64 <1144000000>;
  135             opp-microvolt = <1025000>;
  136         };
  137         opp2_15: opp-1196000000 {
  138             opp-hz = /bits/ 64 <1196000000>;
  139             opp-microvolt = <1050000>;
  140         };
  141     };

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