xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt

Qualcomm Technologies, Inc. CPUFREQ Bindings

CPUFREQ HW is a hardware engine used by some Qualcomm Technologies, Inc. (QTI)
SoCs to manage frequency in hardware. It is capable of controlling frequency
for multiple clusters.

Properties:
- compatible
	Usage:		required
	Value type:	<string>
	Definition:	must be "qcom,cpufreq-hw" or "qcom,cpufreq-epss".

- clocks
	Usage:		required
	Value type:	<phandle> From common clock binding.
	Definition:	clock handle for XO clock and GPLL0 clock.

- clock-names
	Usage:		required
	Value type:	<string> From common clock binding.
	Definition:	must be "xo", "alternate".

- reg
	Usage:		required
	Value type:	<prop-encoded-array>
	Definition:	Addresses and sizes for the memory of the HW bases in
			each frequency domain.
- reg-names
	Usage:		Optional
	Value type:	<string>
	Definition:	Frequency domain name i.e.
			"freq-domain0", "freq-domain1".

- #freq-domain-cells:
	Usage:		required.
	Definition:	Number of cells in a freqency domain specifier.

* Property qcom,freq-domain
Devices supporting freq-domain must set their "qcom,freq-domain" property with
phandle to a cpufreq_hw followed by the Domain ID(0/1) in the CPU DT node.


Example:

Example 1: Dual-cluster, Quad-core per cluster. CPUs within a cluster switch
DCVS state together.

/ {
	cpus {
		#address-cells = <2>;
		#size-cells = <0>;

		CPU0: cpu@0 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x0>;
			enable-method = "psci";
			next-level-cache = <&L2_0>;
			qcom,freq-domain = <&cpufreq_hw 0>;
			L2_0: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
				L3_0: l3-cache {
				      compatible = "cache";
				};
			};
		};

		CPU1: cpu@100 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x100>;
			enable-method = "psci";
			next-level-cache = <&L2_100>;
			qcom,freq-domain = <&cpufreq_hw 0>;
			L2_100: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};

		CPU2: cpu@200 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x200>;
			enable-method = "psci";
			next-level-cache = <&L2_200>;
			qcom,freq-domain = <&cpufreq_hw 0>;
			L2_200: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};

		CPU3: cpu@300 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x300>;
			enable-method = "psci";
			next-level-cache = <&L2_300>;
			qcom,freq-domain = <&cpufreq_hw 0>;
			L2_300: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};

		CPU4: cpu@400 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x400>;
			enable-method = "psci";
			next-level-cache = <&L2_400>;
			qcom,freq-domain = <&cpufreq_hw 1>;
			L2_400: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};

		CPU5: cpu@500 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x500>;
			enable-method = "psci";
			next-level-cache = <&L2_500>;
			qcom,freq-domain = <&cpufreq_hw 1>;
			L2_500: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};

		CPU6: cpu@600 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x600>;
			enable-method = "psci";
			next-level-cache = <&L2_600>;
			qcom,freq-domain = <&cpufreq_hw 1>;
			L2_600: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};

		CPU7: cpu@700 {
			device_type = "cpu";
			compatible = "qcom,kryo385";
			reg = <0x0 0x700>;
			enable-method = "psci";
			next-level-cache = <&L2_700>;
			qcom,freq-domain = <&cpufreq_hw 1>;
			L2_700: l2-cache {
				compatible = "cache";
				next-level-cache = <&L3_0>;
			};
		};
	};

 soc {
	cpufreq_hw: cpufreq@17d43000 {
		compatible = "qcom,cpufreq-hw";
		reg = <0x17d43000 0x1400>, <0x17d45800 0x1400>;
		reg-names = "freq-domain0", "freq-domain1";

		clocks = <&rpmhcc RPMH_CXO_CLK>, <&gcc GPLL0>;
		clock-names = "xo", "alternate";

		#freq-domain-cells = <1>;
	};
}