Rama Aparna Mallavarapu
7df4a9c57f
Target can support different DDR HW versions supporting different frequencies, add support in DT to update the devfreq nodes with corresponding frequency mapping based on DDR type supported. Change-Id: If998c5181c7f8569259f528f07c5975ccd5b2f29
76 lines
2.3 KiB
Plaintext
76 lines
2.3 KiB
Plaintext
MSM device bandwidth device
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devbw is a device that represents a MSM device's BW requirements from its
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master port(s) to a different device's slave port(s) in a MSM SoC. This
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device is typically used to vote for BW requirements from a device's (Eg:
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CPU, GPU) master port(s) to the slave (Eg: DDR) port(s).
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Required properties:
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- compatible: Must be "qcom,devbw" or "qcom,devbw-ddr" or "qcom,devbw-llcc"
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- qcom,src-dst-ports: A list of tuples where each tuple consists of a bus
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master port number and a bus slave port number.
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- operating-points-v2: A phandle to the OPP v2 table that holds meaningful
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instantaneous bandwidth values (in MB/s) that can be
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requested from the device master port to the slave port.
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The list of values depend on the supported bus/slave
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frequencies and the bus width.
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Optional properties:
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- qcom,active-only: Indicates that the bandwidth votes need to be
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enforced only when the CPU subsystem is active.
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- governor: Initial governor to use for the device.
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Default: "performance"
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- opp-supported-hw: For the devices that are compatible with "qcom, devbw-ddr",
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the OPP node can have opp-supported-hw property. This is a
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single 32 bit bitmap value, representing compatible DDR-Type in HW.
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Example:
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Value:
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0x80: Frequency Compatible for LPDDR4X only
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0x100: Frequency Compatible for LPDDR5 only
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0x180: Frequency Compatible for both LPDDR4X and LPDDR5
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Example:
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bw_opp_table: bw-opp-table {
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compatible = "operating-points-v2";
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opp-75 {
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opp-hz = /bits/ 64 < 572 >; /* 75 MHz */
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opp-supported-hw = <0x80>;
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};
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opp-150 {
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opp-hz = /bits/ 64 < 1144 >; /* 150 MHz */
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opp-supported-hw = <0x80>;
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};
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opp-200 {
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opp-hz = /bits/ 64 < 1525 >; /* 200 MHz */
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opp-supported-hw = <0x180>;
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};
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opp-307 {
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opp-hz = /bits/ 64 < 2342 >; /* 307 MHz */
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opp-supported-hw = <0x80>;
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};
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opp-460 {
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opp-hz = /bits/ 64 < 3509 >; /* 460 MHz */
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opp-supported-hw = <0x80>;
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};
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opp-614 {
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opp-hz = /bits/ 64 < 4684 >; /* 614 MHz */
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opp-supported-hw = <0x80>;
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};
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opp-800 {
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opp-hz = /bits/ 64 < 6103 >; /* 800 MHz */
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opp-supported-hw = <0x80>;
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};
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opp-931 {
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opp-hz = /bits/ 64 < 7102 >; /* 931 MHz */
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opp-supported-hw = <0x80>;
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};
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};
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qcom,cpubw {
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compatible = "qcom,devbw-ddr";
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qcom,src-dst-ports = <1 512>, <2 512>;
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qcom,active-only;
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operating-points-v2 = <&bw_opp_table>;
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};
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