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132 lines
3.5 KiB
132 lines
3.5 KiB
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, |
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omap34xx, omap36xx and am3517 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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- "vdd-supply", "vbb-supply": to define two regulators for dra7xx |
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- "cpu0-supply", "vbb-supply": to define two regulators for omap36xx |
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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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