Merge "PM / devfreq: Make the CPUBW voting device driver to be more generic" (6543cc6d) · Commits · e / devices / android_kernel_sony_msm8994

Documentation/devicetree/bindings/arm/msm/cpubw.txt

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		MSM CPU bandwidth device

		cpubw is a device that represents the CPU subsystem master ports in a MSM SoC
		and the related info that is needed to make CPU to DDR bandwidth votes.

		Required properties:
		- compatible: Must be "qcom,cpubw"
		- qcom,cpu-mem-ports: A list of tuples where each tuple consists of a bus
		master (CPU subsystem) port number and a bus slave
		(memory) port number.
		- qcom,bw-tbl: A list of meaningful instantaneous bandwidth values
		(in MB/s) that can be requested from the CPU
		subsystem to DDR. The list of values depend on the
		supported DDR frequencies and the bus widths.

		Example:

		qcom,cpubw {
		compatible = "qcom,cpubw";
		qcom,cpu-mem-ports = <1 512>, <2 512>;
		qcom,bw-tbl =
		< 572 /* 75 MHz */ >,
		< 1144 /* 150 MHz */ >,
		< 1525 /* 200 MHz */ >,
		< 2342 /* 307 MHz */ >,
		< 3509 /* 460 MHz */ >,
		< 4684 /* 614 MHz */ >,
		< 6103 /* 800 MHz */ >,
		< 7102 /* 931 MHz */ >;
		};

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		MSM device bandwidth device

		devbw is a device that represents a MSM device's BW requirements from its
		master port(s) to a different device's slave port(s) in a MSM SoC. This
		device is typically used to vote for BW requirements from a device's (Eg:
		CPU, GPU) master port(s) to the slave (Eg: DDR) port(s).

		Required properties:
		- compatible: Must be "qcom,devbw"
		- qcom,src-dst-ports: A list of tuples where each tuple consists of a bus
		master port number and a bus slave port number.
		- qcom,bw-tbl: A list of meaningful instantaneous bandwidth values
		(in MB/s) that can be requested from the device
		master port to the slave port. The list of values
		depend on the supported bus/slave frequencies and the
		bus width.

		Optional properties:
		- qcom,active-only: Indicates that the bandwidth votes need to be
		enforced only when the CPU subsystem is active.
		- governor: Initial governor to use for the device.
		Default: "performance"

		Example:

		qcom,cpubw {
		compatible = "qcom,devbw";
		qcom,src-dst-ports = <1 512>, <2 512>;
		qcom,active-only;
		qcom,bw-tbl =
		< 572 /* 75 MHz */ >,
		< 1144 /* 150 MHz */ >,
		< 1525 /* 200 MHz */ >,
		< 2342 /* 307 MHz */ >,
		< 3509 /* 460 MHz */ >,
		< 4684 /* 614 MHz */ >,
		< 6103 /* 800 MHz */ >,
		< 7102 /* 931 MHz */ >;
		};

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