ti-cpufreq.txt

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    1 TI CPUFreq and OPP bindings
    2 ================================
    3 
    4 Certain TI SoCs, like those in the am335x, am437x, am57xx, and dra7xx
    5 families support different OPPs depending on the silicon variant in use.
    6 The ti-cpufreq driver can use revision and an efuse value from the SoC to
    7 provide the OPP framework with supported hardware information. This is
    8 used to determine which OPPs from the operating-points-v2 table get enabled
    9 when it is parsed by the OPP framework.
   10 
   11 Required properties:
   12 --------------------
   13 In 'cpus' nodes:
   14 - operating-points-v2: Phandle to the operating-points-v2 table to use.
   15 
   16 In 'operating-points-v2' table:
   17 - compatible: Should be
   18         - 'operating-points-v2-ti-cpu' for am335x, am43xx, and dra7xx/am57xx,
   19           omap34xx, omap36xx and am3517 SoCs
   20 - syscon: A phandle pointing to a syscon node representing the control module
   21           register space of the SoC.
   22 
   23 Optional properties:
   24 --------------------
   25 - "vdd-supply", "vbb-supply": to define two regulators for dra7xx
   26 - "cpu0-supply", "vbb-supply": to define two regulators for omap36xx
   27 
   28 For each opp entry in 'operating-points-v2' table:
   29 - opp-supported-hw: Two bitfields indicating:
   30         1. Which revision of the SoC the OPP is supported by
   31         2. Which eFuse bits indicate this OPP is available
   32 
   33         A bitwise AND is performed against these values and if any bit
   34         matches, the OPP gets enabled.
   35 
   36 Example:
   37 --------
   38 
   39 /* From arch/arm/boot/dts/am33xx.dtsi */
   40 cpus {
   41         #address-cells = <1>;
   42         #size-cells = <0>;
   43         cpu@0 {
   44                 compatible = "arm,cortex-a8";
   45                 device_type = "cpu";
   46                 reg = <0>;
   47 
   48                 operating-points-v2 = <&cpu0_opp_table>;
   49 
   50                 clocks = <&dpll_mpu_ck>;
   51                 clock-names = "cpu";
   52 
   53                 clock-latency = <300000>; /* From omap-cpufreq driver */
   54         };
   55 };
   56 
   57 /*
   58  * cpu0 has different OPPs depending on SoC revision and some on revisions
   59  * 0x2 and 0x4 have eFuse bits that indicate if they are available or not
   60  */
   61 cpu0_opp_table: opp-table {
   62         compatible = "operating-points-v2-ti-cpu";
   63         syscon = <&scm_conf>;
   64 
   65         /*
   66          * The three following nodes are marked with opp-suspend
   67          * because they can not be enabled simultaneously on a
   68          * single SoC.
   69          */
   70         opp50-300000000 {
   71                 opp-hz = /bits/ 64 <300000000>;
   72                 opp-microvolt = <950000 931000 969000>;
   73                 opp-supported-hw = <0x06 0x0010>;
   74                 opp-suspend;
   75         };
   76 
   77         opp100-275000000 {
   78                 opp-hz = /bits/ 64 <275000000>;
   79                 opp-microvolt = <1100000 1078000 1122000>;
   80                 opp-supported-hw = <0x01 0x00FF>;
   81                 opp-suspend;
   82         };
   83 
   84         opp100-300000000 {
   85                 opp-hz = /bits/ 64 <300000000>;
   86                 opp-microvolt = <1100000 1078000 1122000>;
   87                 opp-supported-hw = <0x06 0x0020>;
   88                 opp-suspend;
   89         };
   90 
   91         opp100-500000000 {
   92                 opp-hz = /bits/ 64 <500000000>;
   93                 opp-microvolt = <1100000 1078000 1122000>;
   94                 opp-supported-hw = <0x01 0xFFFF>;
   95         };
   96 
   97         opp100-600000000 {
   98                 opp-hz = /bits/ 64 <600000000>;
   99                 opp-microvolt = <1100000 1078000 1122000>;
  100                 opp-supported-hw = <0x06 0x0040>;
  101         };
  102 
  103         opp120-600000000 {
  104                 opp-hz = /bits/ 64 <600000000>;
  105                 opp-microvolt = <1200000 1176000 1224000>;
  106                 opp-supported-hw = <0x01 0xFFFF>;
  107         };
  108 
  109         opp120-720000000 {
  110                 opp-hz = /bits/ 64 <720000000>;
  111                 opp-microvolt = <1200000 1176000 1224000>;
  112                 opp-supported-hw = <0x06 0x0080>;
  113         };
  114 
  115         oppturbo-720000000 {
  116                 opp-hz = /bits/ 64 <720000000>;
  117                 opp-microvolt = <1260000 1234800 1285200>;
  118                 opp-supported-hw = <0x01 0xFFFF>;
  119         };
  120 
  121         oppturbo-800000000 {
  122                 opp-hz = /bits/ 64 <800000000>;
  123                 opp-microvolt = <1260000 1234800 1285200>;
  124                 opp-supported-hw = <0x06 0x0100>;
  125         };
  126 
  127         oppnitro-1000000000 {
  128                 opp-hz = /bits/ 64 <1000000000>;
  129                 opp-microvolt = <1325000 1298500 1351500>;
  130                 opp-supported-hw = <0x04 0x0200>;
  131         };
  132 };

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sys/contrib/device-tree/Bindings/cpufreq/ti-cpufreq.txt