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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"
- qcom,ab-percent: Indicates a value in percent of instantaneous
bandwidth which will be used to calculate the
absolute/average bandwidth.
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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