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

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.txt
	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:
	Please refer to Documentation/devicetree/bindings/thermal/thermal.txt
	for detail.

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-a57";
		reg = <0x100>;
		enable-method = "psci";
		cpu-idle-states = <&CPU_SLEEP_0>;
		clocks = <&infracfg CLK_INFRA_CA57SEL>,
			 <&apmixedsys CLK_APMIXED_MAINPLL>;
		clock-names = "cpu", "intermediate";
		operating-points-v2 = <&cpu_opp_table_b>;
	};

	cpu3: cpu@101 {
		device_type = "cpu";
		compatible = "arm,cortex-a57";
		reg = <0x101>;
		enable-method = "psci";
		cpu-idle-states = <&CPU_SLEEP_0>;
		clocks = <&infracfg CLK_INFRA_CA57SEL>,
			 <&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>;
	};