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1Binding for MediaTek's CPUFreq driver2=====================================3 4Required 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" clock9 source (usually MAINPLL) when the original CPU PLL is under10 transition and not stable yet.11 Please refer to Documentation/devicetree/bindings/clock/clock-bindings.txt for12 generic clock consumer properties.13- operating-points-v2: Please refer to Documentation/devicetree/bindings/opp/opp-v2.yaml14 for detail.15- proc-supply: Regulator for Vproc of CPU cluster.16 17Optional properties:18- sram-supply: Regulator for Vsram of CPU cluster. When present, the cpufreq driver19 needs to do "voltage tracking" to step by step scale up/down Vproc and20 Vsram to fit SoC specific needs. When absent, the voltage scaling21 flow is handled by hardware, hence no software "voltage tracking" is22 needed.23- mediatek,cci:24 Used to confirm the link status between cpufreq and mediatek cci. Because25 cpufreq and mediatek cci could share the same regulator in some MediaTek SoCs.26 To prevent the issue of high frequency and low voltage, we need to use this27 property to make sure mediatek cci is ready.28 For details of mediatek cci, please refer to29 Documentation/devicetree/bindings/interconnect/mediatek,cci.yaml30- #cooling-cells:31 For details, please refer to32 Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml33 34Example 1 (MT7623 SoC):35 36 cpu_opp_table: opp_table {37 compatible = "operating-points-v2";38 opp-shared;39 40 opp-598000000 {41 opp-hz = /bits/ 64 <598000000>;42 opp-microvolt = <1050000>;43 };44 45 opp-747500000 {46 opp-hz = /bits/ 64 <747500000>;47 opp-microvolt = <1050000>;48 };49 50 opp-1040000000 {51 opp-hz = /bits/ 64 <1040000000>;52 opp-microvolt = <1150000>;53 };54 55 opp-1196000000 {56 opp-hz = /bits/ 64 <1196000000>;57 opp-microvolt = <1200000>;58 };59 60 opp-1300000000 {61 opp-hz = /bits/ 64 <1300000000>;62 opp-microvolt = <1300000>;63 };64 };65 66 cpu0: cpu@0 {67 device_type = "cpu";68 compatible = "arm,cortex-a7";69 reg = <0x0>;70 clocks = <&infracfg CLK_INFRA_CPUSEL>,71 <&apmixedsys CLK_APMIXED_MAINPLL>;72 clock-names = "cpu", "intermediate";73 operating-points-v2 = <&cpu_opp_table>;74 #cooling-cells = <2>;75 };76 cpu@1 {77 device_type = "cpu";78 compatible = "arm,cortex-a7";79 reg = <0x1>;80 operating-points-v2 = <&cpu_opp_table>;81 };82 cpu@2 {83 device_type = "cpu";84 compatible = "arm,cortex-a7";85 reg = <0x2>;86 operating-points-v2 = <&cpu_opp_table>;87 };88 cpu@3 {89 device_type = "cpu";90 compatible = "arm,cortex-a7";91 reg = <0x3>;92 operating-points-v2 = <&cpu_opp_table>;93 };94 95Example 2 (MT8173 SoC):96 cpu_opp_table_a: opp_table_a {97 compatible = "operating-points-v2";98 opp-shared;99 100 opp-507000000 {101 opp-hz = /bits/ 64 <507000000>;102 opp-microvolt = <859000>;103 };104 105 opp-702000000 {106 opp-hz = /bits/ 64 <702000000>;107 opp-microvolt = <908000>;108 };109 110 opp-1001000000 {111 opp-hz = /bits/ 64 <1001000000>;112 opp-microvolt = <983000>;113 };114 115 opp-1105000000 {116 opp-hz = /bits/ 64 <1105000000>;117 opp-microvolt = <1009000>;118 };119 120 opp-1183000000 {121 opp-hz = /bits/ 64 <1183000000>;122 opp-microvolt = <1028000>;123 };124 125 opp-1404000000 {126 opp-hz = /bits/ 64 <1404000000>;127 opp-microvolt = <1083000>;128 };129 130 opp-1508000000 {131 opp-hz = /bits/ 64 <1508000000>;132 opp-microvolt = <1109000>;133 };134 135 opp-1573000000 {136 opp-hz = /bits/ 64 <1573000000>;137 opp-microvolt = <1125000>;138 };139 };140 141 cpu_opp_table_b: opp_table_b {142 compatible = "operating-points-v2";143 opp-shared;144 145 opp-507000000 {146 opp-hz = /bits/ 64 <507000000>;147 opp-microvolt = <828000>;148 };149 150 opp-702000000 {151 opp-hz = /bits/ 64 <702000000>;152 opp-microvolt = <867000>;153 };154 155 opp-1001000000 {156 opp-hz = /bits/ 64 <1001000000>;157 opp-microvolt = <927000>;158 };159 160 opp-1209000000 {161 opp-hz = /bits/ 64 <1209000000>;162 opp-microvolt = <968000>;163 };164 165 opp-1404000000 {166 opp-hz = /bits/ 64 <1007000000>;167 opp-microvolt = <1028000>;168 };169 170 opp-1612000000 {171 opp-hz = /bits/ 64 <1612000000>;172 opp-microvolt = <1049000>;173 };174 175 opp-1807000000 {176 opp-hz = /bits/ 64 <1807000000>;177 opp-microvolt = <1089000>;178 };179 180 opp-1989000000 {181 opp-hz = /bits/ 64 <1989000000>;182 opp-microvolt = <1125000>;183 };184 };185 186 cpu0: cpu@0 {187 device_type = "cpu";188 compatible = "arm,cortex-a53";189 reg = <0x000>;190 enable-method = "psci";191 cpu-idle-states = <&CPU_SLEEP_0>;192 clocks = <&infracfg CLK_INFRA_CA53SEL>,193 <&apmixedsys CLK_APMIXED_MAINPLL>;194 clock-names = "cpu", "intermediate";195 operating-points-v2 = <&cpu_opp_table_a>;196 };197 198 cpu1: cpu@1 {199 device_type = "cpu";200 compatible = "arm,cortex-a53";201 reg = <0x001>;202 enable-method = "psci";203 cpu-idle-states = <&CPU_SLEEP_0>;204 clocks = <&infracfg CLK_INFRA_CA53SEL>,205 <&apmixedsys CLK_APMIXED_MAINPLL>;206 clock-names = "cpu", "intermediate";207 operating-points-v2 = <&cpu_opp_table_a>;208 };209 210 cpu2: cpu@100 {211 device_type = "cpu";212 compatible = "arm,cortex-a72";213 reg = <0x100>;214 enable-method = "psci";215 cpu-idle-states = <&CPU_SLEEP_0>;216 clocks = <&infracfg CLK_INFRA_CA72SEL>,217 <&apmixedsys CLK_APMIXED_MAINPLL>;218 clock-names = "cpu", "intermediate";219 operating-points-v2 = <&cpu_opp_table_b>;220 };221 222 cpu3: cpu@101 {223 device_type = "cpu";224 compatible = "arm,cortex-a72";225 reg = <0x101>;226 enable-method = "psci";227 cpu-idle-states = <&CPU_SLEEP_0>;228 clocks = <&infracfg CLK_INFRA_CA72SEL>,229 <&apmixedsys CLK_APMIXED_MAINPLL>;230 clock-names = "cpu", "intermediate";231 operating-points-v2 = <&cpu_opp_table_b>;232 };233 234 &cpu0 {235 proc-supply = <&mt6397_vpca15_reg>;236 };237 238 &cpu1 {239 proc-supply = <&mt6397_vpca15_reg>;240 };241 242 &cpu2 {243 proc-supply = <&da9211_vcpu_reg>;244 sram-supply = <&mt6397_vsramca7_reg>;245 };246 247 &cpu3 {248 proc-supply = <&da9211_vcpu_reg>;249 sram-supply = <&mt6397_vsramca7_reg>;250 };251