Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt

   1 Binding for MediaTek's CPUFreq driver
   2 =====================================
   3
   4 Required properties:
   5 - clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock names.
   6 - clock-names: Should contain the following:
   7         "cpu"           - The multiplexer for clock input of CPU cluster.
   8         "intermediate"  - A parent of "cpu" clock which is used as "intermediate" clock
   9                           source (usually MAINPLL) when the original CPU PLL is under
  10                           transition and not stable yet.
  11         Please refer to Documentation/devicetree/bindings/clk/clock-bindings.txt for
  12         generic clock consumer properties.
  13 - operating-points-v2: Please refer to Documentation/devicetree/bindings/opp/opp.txt
  14         for detail.
  15 - proc-supply: Regulator for Vproc of CPU cluster.
  16
  17 Optional properties:
  18 - sram-supply: Regulator for Vsram of CPU cluster. When present, the cpufreq driver
  19                needs to do "voltage tracking" to step by step scale up/down Vproc and
  20                Vsram to fit SoC specific needs. When absent, the voltage scaling
  21                flow is handled by hardware, hence no software "voltage tracking" is
  22                needed.
  23 - #cooling-cells:
  24         Please refer to Documentation/devicetree/bindings/thermal/thermal.txt
  25         for detail.
  26
  27 Example 1 (MT7623 SoC):
  28
  29         cpu_opp_table: opp_table {
  30                 compatible = "operating-points-v2";
  31                 opp-shared;
  32
  33                 opp-598000000 {
  34                         opp-hz = /bits/ 64 <598000000>;
  35                         opp-microvolt = <1050000>;
  36                 };
  37
  38                 opp-747500000 {
  39                         opp-hz = /bits/ 64 <747500000>;
  40                         opp-microvolt = <1050000>;
  41                 };
  42
  43                 opp-1040000000 {
  44                         opp-hz = /bits/ 64 <1040000000>;
  45                         opp-microvolt = <1150000>;
  46                 };
  47
  48                 opp-1196000000 {
  49                         opp-hz = /bits/ 64 <1196000000>;
  50                         opp-microvolt = <1200000>;
  51                 };
  52
  53                 opp-1300000000 {
  54                         opp-hz = /bits/ 64 <1300000000>;
  55                         opp-microvolt = <1300000>;
  56                 };
  57         };
  58
  59         cpu0: cpu@0 {
  60                 device_type = "cpu";
  61                 compatible = "arm,cortex-a7";
  62                 reg = <0x0>;
  63                 clocks = <&infracfg CLK_INFRA_CPUSEL>,
  64                          <&apmixedsys CLK_APMIXED_MAINPLL>;
  65                 clock-names = "cpu", "intermediate";
  66                 operating-points-v2 = <&cpu_opp_table>;
  67                 #cooling-cells = <2>;
  68         };
  69         cpu@1 {
  70                 device_type = "cpu";
  71                 compatible = "arm,cortex-a7";
  72                 reg = <0x1>;
  73                 operating-points-v2 = <&cpu_opp_table>;
  74         };
  75         cpu@2 {
  76                 device_type = "cpu";
  77                 compatible = "arm,cortex-a7";
  78                 reg = <0x2>;
  79                 operating-points-v2 = <&cpu_opp_table>;
  80         };
  81         cpu@3 {
  82                 device_type = "cpu";
  83                 compatible = "arm,cortex-a7";
  84                 reg = <0x3>;
  85                 operating-points-v2 = <&cpu_opp_table>;
  86         };
  87
  88 Example 2 (MT8173 SoC):
  89         cpu_opp_table_a: opp_table_a {
  90                 compatible = "operating-points-v2";
  91                 opp-shared;
  92
  93                 opp-507000000 {
  94                         opp-hz = /bits/ 64 <507000000>;
  95                         opp-microvolt = <859000>;
  96                 };
  97
  98                 opp-702000000 {
  99                         opp-hz = /bits/ 64 <702000000>;
 100                         opp-microvolt = <908000>;
 101                 };
 102
 103                 opp-1001000000 {
 104                         opp-hz = /bits/ 64 <1001000000>;
 105                         opp-microvolt = <983000>;
 106                 };
 107
 108                 opp-1105000000 {
 109                         opp-hz = /bits/ 64 <1105000000>;
 110                         opp-microvolt = <1009000>;
 111                 };
 112
 113                 opp-1183000000 {
 114                         opp-hz = /bits/ 64 <1183000000>;
 115                         opp-microvolt = <1028000>;
 116                 };
 117
 118                 opp-1404000000 {
 119                         opp-hz = /bits/ 64 <1404000000>;
 120                         opp-microvolt = <1083000>;
 121                 };
 122
 123                 opp-1508000000 {
 124                         opp-hz = /bits/ 64 <1508000000>;
 125                         opp-microvolt = <1109000>;
 126                 };
 127
 128                 opp-1573000000 {
 129                         opp-hz = /bits/ 64 <1573000000>;
 130                         opp-microvolt = <1125000>;
 131                 };
 132         };
 133
 134         cpu_opp_table_b: opp_table_b {
 135                 compatible = "operating-points-v2";
 136                 opp-shared;
 137
 138                 opp-507000000 {
 139                         opp-hz = /bits/ 64 <507000000>;
 140                         opp-microvolt = <828000>;
 141                 };
 142
 143                 opp-702000000 {
 144                         opp-hz = /bits/ 64 <702000000>;
 145                         opp-microvolt = <867000>;
 146                 };
 147
 148                 opp-1001000000 {
 149                         opp-hz = /bits/ 64 <1001000000>;
 150                         opp-microvolt = <927000>;
 151                 };
 152
 153                 opp-1209000000 {
 154                         opp-hz = /bits/ 64 <1209000000>;
 155                         opp-microvolt = <968000>;
 156                 };
 157
 158                 opp-1404000000 {
 159                         opp-hz = /bits/ 64 <1007000000>;
 160                         opp-microvolt = <1028000>;
 161                 };
 162
 163                 opp-1612000000 {
 164                         opp-hz = /bits/ 64 <1612000000>;
 165                         opp-microvolt = <1049000>;
 166                 };
 167
 168                 opp-1807000000 {
 169                         opp-hz = /bits/ 64 <1807000000>;
 170                         opp-microvolt = <1089000>;
 171                 };
 172
 173                 opp-1989000000 {
 174                         opp-hz = /bits/ 64 <1989000000>;
 175                         opp-microvolt = <1125000>;
 176                 };
 177         };
 178
 179         cpu0: cpu@0 {
 180                 device_type = "cpu";
 181                 compatible = "arm,cortex-a53";
 182                 reg = <0x000>;
 183                 enable-method = "psci";
 184                 cpu-idle-states = <&CPU_SLEEP_0>;
 185                 clocks = <&infracfg CLK_INFRA_CA53SEL>,
 186                          <&apmixedsys CLK_APMIXED_MAINPLL>;
 187                 clock-names = "cpu", "intermediate";
 188                 operating-points-v2 = <&cpu_opp_table_a>;
 189         };
 190
 191         cpu1: cpu@1 {
 192                 device_type = "cpu";
 193                 compatible = "arm,cortex-a53";
 194                 reg = <0x001>;
 195                 enable-method = "psci";
 196                 cpu-idle-states = <&CPU_SLEEP_0>;
 197                 clocks = <&infracfg CLK_INFRA_CA53SEL>,
 198                          <&apmixedsys CLK_APMIXED_MAINPLL>;
 199                 clock-names = "cpu", "intermediate";
 200                 operating-points-v2 = <&cpu_opp_table_a>;
 201         };
 202
 203         cpu2: cpu@100 {
 204                 device_type = "cpu";
 205                 compatible = "arm,cortex-a57";
 206                 reg = <0x100>;
 207                 enable-method = "psci";
 208                 cpu-idle-states = <&CPU_SLEEP_0>;
 209                 clocks = <&infracfg CLK_INFRA_CA57SEL>,
 210                          <&apmixedsys CLK_APMIXED_MAINPLL>;
 211                 clock-names = "cpu", "intermediate";
 212                 operating-points-v2 = <&cpu_opp_table_b>;
 213         };
 214
 215         cpu3: cpu@101 {
 216                 device_type = "cpu";
 217                 compatible = "arm,cortex-a57";
 218                 reg = <0x101>;
 219                 enable-method = "psci";
 220                 cpu-idle-states = <&CPU_SLEEP_0>;
 221                 clocks = <&infracfg CLK_INFRA_CA57SEL>,
 222                          <&apmixedsys CLK_APMIXED_MAINPLL>;
 223                 clock-names = "cpu", "intermediate";
 224                 operating-points-v2 = <&cpu_opp_table_b>;
 225         };
 226
 227         &cpu0 {
 228                 proc-supply = <&mt6397_vpca15_reg>;
 229         };
 230
 231         &cpu1 {
 232                 proc-supply = <&mt6397_vpca15_reg>;
 233         };
 234
 235         &cpu2 {
 236                 proc-supply = <&da9211_vcpu_reg>;
 237                 sram-supply = <&mt6397_vsramca7_reg>;
 238         };
 239
 240         &cpu3 {
 241                 proc-supply = <&da9211_vcpu_reg>;
 242                 sram-supply = <&mt6397_vsramca7_reg>;
 243         };