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Binding for MediaTek's CPUFreq driver
=====================================
Required properties:
- clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock names.
- clock-names: Should contain the following:
"cpu" - The multiplexer for clock input of CPU cluster.
"intermediate" - A parent of "cpu" clock which is used as "intermediate" clock
source (usually MAINPLL) when the original CPU PLL is under
transition and not stable yet.
Please refer to Documentation/devicetree/bindings/clock/clock-bindings.txt for
generic clock consumer properties.
- operating-points-v2: Please refer to Documentation/devicetree/bindings/opp/opp-v2.yaml
for detail.
- proc-supply: Regulator for Vproc of CPU cluster.
Optional properties:
- sram-supply: Regulator for Vsram of CPU cluster. When present, the cpufreq driver
needs to do "voltage tracking" to step by step scale up/down Vproc and
Vsram to fit SoC specific needs. When absent, the voltage scaling
flow is handled by hardware, hence no software "voltage tracking" is
needed.
- #cooling-cells:
For details, please refer to
Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml
Example 1 (MT7623 SoC):
cpu_opp_table: opp_table {
compatible = "operating-points-v2";
opp-shared;
opp-598000000 {
opp-hz = /bits/ 64 <598000000>;
opp-microvolt = <1050000>;
};
opp-747500000 {
opp-hz = /bits/ 64 <747500000>;
opp-microvolt = <1050000>;
};
opp-1040000000 {
opp-hz = /bits/ 64 <1040000000>;
opp-microvolt = <1150000>;
};
opp-1196000000 {
opp-hz = /bits/ 64 <1196000000>;
opp-microvolt = <1200000>;
};
opp-1300000000 {
opp-hz = /bits/ 64 <1300000000>;
opp-microvolt = <1300000>;
};
};
cpu0: cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a7";
reg = <0x0>;
clocks = <&infracfg CLK_INFRA_CPUSEL>,
<&apmixedsys CLK_APMIXED_MAINPLL>;
clock-names = "cpu", "intermediate";
operating-points-v2 = <&cpu_opp_table>;
#cooling-cells = <2>;
};
cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a7";
reg = <0x1>;
operating-points-v2 = <&cpu_opp_table>;
};
cpu@2 {
device_type = "cpu";
compatible = "arm,cortex-a7";
reg = <0x2>;
operating-points-v2 = <&cpu_opp_table>;
};
cpu@3 {
device_type = "cpu";
compatible = "arm,cortex-a7";
reg = <0x3>;
operating-points-v2 = <&cpu_opp_table>;
};
Example 2 (MT8173 SoC):
cpu_opp_table_a: opp_table_a {
compatible = "operating-points-v2";
opp-shared;
opp-507000000 {
opp-hz = /bits/ 64 <507000000>;
opp-microvolt = <859000>;
};
opp-702000000 {
opp-hz = /bits/ 64 <702000000>;
opp-microvolt = <908000>;
};
opp-1001000000 {
opp-hz = /bits/ 64 <1001000000>;
opp-microvolt = <983000>;
};
opp-1105000000 {
opp-hz = /bits/ 64 <1105000000>;
opp-microvolt = <1009000>;
};
opp-1183000000 {
opp-hz = /bits/ 64 <1183000000>;
opp-microvolt = <1028000>;
};
opp-1404000000 {
opp-hz = /bits/ 64 <1404000000>;
opp-microvolt = <1083000>;
};
opp-1508000000 {
opp-hz = /bits/ 64 <1508000000>;
opp-microvolt = <1109000>;
};
opp-1573000000 {
opp-hz = /bits/ 64 <1573000000>;
opp-microvolt = <1125000>;
};
};
cpu_opp_table_b: opp_table_b {
compatible = "operating-points-v2";
opp-shared;
opp-507000000 {
opp-hz = /bits/ 64 <507000000>;
opp-microvolt = <828000>;
};
opp-702000000 {
opp-hz = /bits/ 64 <702000000>;
opp-microvolt = <867000>;
};
opp-1001000000 {
opp-hz = /bits/ 64 <1001000000>;
opp-microvolt = <927000>;
};
opp-1209000000 {
opp-hz = /bits/ 64 <1209000000>;
opp-microvolt = <968000>;
};
opp-1404000000 {
opp-hz = /bits/ 64 <1007000000>;
opp-microvolt = <1028000>;
};
opp-1612000000 {
opp-hz = /bits/ 64 <1612000000>;
opp-microvolt = <1049000>;
};
opp-1807000000 {
opp-hz = /bits/ 64 <1807000000>;
opp-microvolt = <1089000>;
};
opp-1989000000 {
opp-hz = /bits/ 64 <1989000000>;
opp-microvolt = <1125000>;
};
};
cpu0: cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a53";
reg = <0x000>;
enable-method = "psci";
cpu-idle-states = <&CPU_SLEEP_0>;
clocks = <&infracfg CLK_INFRA_CA53SEL>,
<&apmixedsys CLK_APMIXED_MAINPLL>;
clock-names = "cpu", "intermediate";
operating-points-v2 = <&cpu_opp_table_a>;
};
cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a53";
reg = <0x001>;
enable-method = "psci";
cpu-idle-states = <&CPU_SLEEP_0>;
clocks = <&infracfg CLK_INFRA_CA53SEL>,
<&apmixedsys CLK_APMIXED_MAINPLL>;
clock-names = "cpu", "intermediate";
operating-points-v2 = <&cpu_opp_table_a>;
};
cpu2: cpu@100 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0x100>;
enable-method = "psci";
cpu-idle-states = <&CPU_SLEEP_0>;
clocks = <&infracfg CLK_INFRA_CA72SEL>,
<&apmixedsys CLK_APMIXED_MAINPLL>;
clock-names = "cpu", "intermediate";
operating-points-v2 = <&cpu_opp_table_b>;
};
cpu3: cpu@101 {
device_type = "cpu";
compatible = "arm,cortex-a72";
reg = <0x101>;
enable-method = "psci";
cpu-idle-states = <&CPU_SLEEP_0>;
clocks = <&infracfg CLK_INFRA_CA72SEL>,
<&apmixedsys CLK_APMIXED_MAINPLL>;
clock-names = "cpu", "intermediate";
operating-points-v2 = <&cpu_opp_table_b>;
};
&cpu0 {
proc-supply = <&mt6397_vpca15_reg>;
};
&cpu1 {
proc-supply = <&mt6397_vpca15_reg>;
};
&cpu2 {
proc-supply = <&da9211_vcpu_reg>;
sram-supply = <&mt6397_vsramca7_reg>;
};
&cpu3 {
proc-supply = <&da9211_vcpu_reg>;
sram-supply = <&mt6397_vsramca7_reg>;
};
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