129 lines
3.3 KiB
Plaintext
Executable file
129 lines
3.3 KiB
Plaintext
Executable file
TI CPUFreq and OPP bindings
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================================
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Certain TI SoCs, like those in the am335x, am437x, am57xx, and dra7xx
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families support different OPPs depending on the silicon variant in use.
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The ti-cpufreq driver can use revision and an efuse value from the SoC to
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provide the OPP framework with supported hardware information. This is
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used to determine which OPPs from the operating-points-v2 table get enabled
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when it is parsed by the OPP framework.
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Required properties:
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--------------------
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In 'cpus' nodes:
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- operating-points-v2: Phandle to the operating-points-v2 table to use.
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In 'operating-points-v2' table:
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- compatible: Should be
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- 'operating-points-v2-ti-cpu' for am335x, am43xx, and dra7xx/am57xx SoCs
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- syscon: A phandle pointing to a syscon node representing the control module
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register space of the SoC.
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Optional properties:
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--------------------
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For each opp entry in 'operating-points-v2' table:
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- opp-supported-hw: Two bitfields indicating:
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1. Which revision of the SoC the OPP is supported by
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2. Which eFuse bits indicate this OPP is available
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A bitwise AND is performed against these values and if any bit
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matches, the OPP gets enabled.
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Example:
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--------
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/* From arch/arm/boot/dts/am33xx.dtsi */
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cpus {
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#address-cells = <1>;
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#size-cells = <0>;
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cpu@0 {
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compatible = "arm,cortex-a8";
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device_type = "cpu";
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reg = <0>;
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operating-points-v2 = <&cpu0_opp_table>;
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clocks = <&dpll_mpu_ck>;
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clock-names = "cpu";
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clock-latency = <300000>; /* From omap-cpufreq driver */
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};
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};
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/*
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* cpu0 has different OPPs depending on SoC revision and some on revisions
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* 0x2 and 0x4 have eFuse bits that indicate if they are available or not
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*/
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cpu0_opp_table: opp-table {
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compatible = "operating-points-v2-ti-cpu";
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syscon = <&scm_conf>;
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/*
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* The three following nodes are marked with opp-suspend
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* because they can not be enabled simultaneously on a
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* single SoC.
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*/
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opp50-300000000 {
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opp-hz = /bits/ 64 <300000000>;
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opp-microvolt = <950000 931000 969000>;
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opp-supported-hw = <0x06 0x0010>;
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opp-suspend;
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};
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opp100-275000000 {
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opp-hz = /bits/ 64 <275000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x01 0x00FF>;
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opp-suspend;
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};
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opp100-300000000 {
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opp-hz = /bits/ 64 <300000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x06 0x0020>;
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opp-suspend;
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};
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opp100-500000000 {
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opp-hz = /bits/ 64 <500000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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opp100-600000000 {
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opp-hz = /bits/ 64 <600000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x06 0x0040>;
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};
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opp120-600000000 {
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opp-hz = /bits/ 64 <600000000>;
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opp-microvolt = <1200000 1176000 1224000>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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opp120-720000000 {
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opp-hz = /bits/ 64 <720000000>;
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opp-microvolt = <1200000 1176000 1224000>;
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opp-supported-hw = <0x06 0x0080>;
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};
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oppturbo-720000000 {
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opp-hz = /bits/ 64 <720000000>;
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opp-microvolt = <1260000 1234800 1285200>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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oppturbo-800000000 {
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opp-hz = /bits/ 64 <800000000>;
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opp-microvolt = <1260000 1234800 1285200>;
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opp-supported-hw = <0x06 0x0100>;
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};
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oppnitro-1000000000 {
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opp-hz = /bits/ 64 <1000000000>;
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opp-microvolt = <1325000 1298500 1351500>;
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opp-supported-hw = <0x04 0x0200>;
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};
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};
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