qcom,cpr.txt

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    1 QCOM CPR (Core Power Reduction)
    2 
    3 CPR (Core Power Reduction) is a technology to reduce core power on a CPU
    4 or other device. Each OPP of a device corresponds to a "corner" that has
    5 a range of valid voltages for a particular frequency. While the device is
    6 running at a particular frequency, CPR monitors dynamic factors such as
    7 temperature, etc. and suggests adjustments to the voltage to save power
    8 and meet silicon characteristic requirements.
    9 
   10 - compatible:
   11         Usage: required
   12         Value type: <string>
   13         Definition: should be "qcom,qcs404-cpr", "qcom,cpr" for qcs404
   14 
   15 - reg:
   16         Usage: required
   17         Value type: <prop-encoded-array>
   18         Definition: base address and size of the rbcpr register region
   19 
   20 - interrupts:
   21         Usage: required
   22         Value type: <prop-encoded-array>
   23         Definition: should specify the CPR interrupt
   24 
   25 - clocks:
   26         Usage: required
   27         Value type: <prop-encoded-array>
   28         Definition: phandle to the reference clock
   29 
   30 - clock-names:
   31         Usage: required
   32         Value type: <stringlist>
   33         Definition: must be "ref"
   34 
   35 - vdd-apc-supply:
   36         Usage: required
   37         Value type: <phandle>
   38         Definition: phandle to the vdd-apc-supply regulator
   39 
   40 - #power-domain-cells:
   41         Usage: required
   42         Value type: <u32>
   43         Definition: should be 0
   44 
   45 - operating-points-v2:
   46         Usage: required
   47         Value type: <phandle>
   48         Definition: A phandle to the OPP table containing the
   49                     performance states supported by the CPR
   50                     power domain
   51 
   52 - acc-syscon:
   53         Usage: optional
   54         Value type: <phandle>
   55         Definition: phandle to syscon for writing ACC settings
   56 
   57 - nvmem-cells:
   58         Usage: required
   59         Value type: <phandle>
   60         Definition: phandle to nvmem cells containing the data
   61                     that makes up a fuse corner, for each fuse corner.
   62                     As well as the CPR fuse revision.
   63 
   64 - nvmem-cell-names:
   65         Usage: required
   66         Value type: <stringlist>
   67         Definition: should be "cpr_quotient_offset1", "cpr_quotient_offset2",
   68                     "cpr_quotient_offset3", "cpr_init_voltage1",
   69                     "cpr_init_voltage2", "cpr_init_voltage3", "cpr_quotient1",
   70                     "cpr_quotient2", "cpr_quotient3", "cpr_ring_osc1",
   71                     "cpr_ring_osc2", "cpr_ring_osc3", "cpr_fuse_revision"
   72                     for qcs404.
   73 
   74 Example:
   75 
   76         cpr_opp_table: cpr-opp-table {
   77                 compatible = "operating-points-v2-qcom-level";
   78 
   79                 cpr_opp1: opp1 {
   80                         opp-level = <1>;
   81                         qcom,opp-fuse-level = <1>;
   82                 };
   83                 cpr_opp2: opp2 {
   84                         opp-level = <2>;
   85                         qcom,opp-fuse-level = <2>;
   86                 };
   87                 cpr_opp3: opp3 {
   88                         opp-level = <3>;
   89                         qcom,opp-fuse-level = <3>;
   90                 };
   91         };
   92 
   93         power-controller@b018000 {
   94                 compatible = "qcom,qcs404-cpr", "qcom,cpr";
   95                 reg = <0x0b018000 0x1000>;
   96                 interrupts = <0 15 IRQ_TYPE_EDGE_RISING>;
   97                 clocks = <&xo_board>;
   98                 clock-names = "ref";
   99                 vdd-apc-supply = <&pms405_s3>;
  100                 #power-domain-cells = <0>;
  101                 operating-points-v2 = <&cpr_opp_table>;
  102                 acc-syscon = <&tcsr>;
  103 
  104                 nvmem-cells = <&cpr_efuse_quot_offset1>,
  105                         <&cpr_efuse_quot_offset2>,
  106                         <&cpr_efuse_quot_offset3>,
  107                         <&cpr_efuse_init_voltage1>,
  108                         <&cpr_efuse_init_voltage2>,
  109                         <&cpr_efuse_init_voltage3>,
  110                         <&cpr_efuse_quot1>,
  111                         <&cpr_efuse_quot2>,
  112                         <&cpr_efuse_quot3>,
  113                         <&cpr_efuse_ring1>,
  114                         <&cpr_efuse_ring2>,
  115                         <&cpr_efuse_ring3>,
  116                         <&cpr_efuse_revision>;
  117                 nvmem-cell-names = "cpr_quotient_offset1",
  118                         "cpr_quotient_offset2",
  119                         "cpr_quotient_offset3",
  120                         "cpr_init_voltage1",
  121                         "cpr_init_voltage2",
  122                         "cpr_init_voltage3",
  123                         "cpr_quotient1",
  124                         "cpr_quotient2",
  125                         "cpr_quotient3",
  126                         "cpr_ring_osc1",
  127                         "cpr_ring_osc2",
  128                         "cpr_ring_osc3",
  129                         "cpr_fuse_revision";
  130         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/power/avs/qcom,cpr.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/power/avs/qcom,cpr.txt