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Diffstat (limited to 'Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt')
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diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt deleted file mode 100644 index aea4a2a178b9..000000000000 --- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt +++ /dev/null @@ -1,238 +0,0 @@ -Tegra124 SOCTHERM thermal management system - -The SOCTHERM IP block contains thermal sensors, support for polled -or interrupt-based thermal monitoring, CPU and GPU throttling based -on temperature trip points, and handling external overcurrent -notifications. It is also used to manage emergency shutdown in an -overheating situation. - -Required properties : -- compatible : For Tegra124, must contain "nvidia,tegra124-soctherm". - For Tegra132, must contain "nvidia,tegra132-soctherm". - For Tegra210, must contain "nvidia,tegra210-soctherm". -- reg : Should contain at least 2 entries for each entry in reg-names: - - SOCTHERM register set - - Tegra CAR register set: Required for Tegra124 and Tegra210. - - CCROC register set: Required for Tegra132. -- reg-names : Should contain at least 2 entries: - - soctherm-reg - - car-reg - - ccroc-reg -- interrupts : Defines the interrupt used by SOCTHERM -- clocks : Must contain an entry for each entry in clock-names. - See ../clocks/clock-bindings.txt for details. -- clock-names : Must include the following entries: - - tsensor - - soctherm -- resets : Must contain an entry for each entry in reset-names. - See ../reset/reset.txt for details. -- reset-names : Must include the following entries: - - soctherm -- #thermal-sensor-cells : Should be 1. For a description of this property, see - Documentation/devicetree/bindings/thermal/thermal-sensor.yaml. - See <dt-bindings/thermal/tegra124-soctherm.h> for a list of valid values - when referring to thermal sensors. -- throttle-cfgs: A sub-node which is a container of configuration for each - hardware throttle events. These events can be set as cooling devices. - * throttle events: Sub-nodes must be named as "light" or "heavy". - Properties: - - nvidia,priority: Each throttles has its own throttle settings, so the - SW need to set priorities for various throttle, the HW arbiter can select - the final throttle settings. - Bigger value indicates higher priority, In general, higher priority - translates to lower target frequency. SW needs to ensure that critical - thermal alarms are given higher priority, and ensure that there is - no race if priority of two vectors is set to the same value. - The range of this value is 1~100. - - nvidia,cpu-throt-percent: This property is for Tegra124 and Tegra210. - It is the throttling depth of pulse skippers, it's the percentage - throttling. - - nvidia,cpu-throt-level: This property is only for Tegra132, it is the - level of pulse skippers, which used to throttle clock frequencies. It - indicates cpu clock throttling depth, and the depth can be programmed. - Must set as following values: - TEGRA_SOCTHERM_THROT_LEVEL_LOW, TEGRA_SOCTHERM_THROT_LEVEL_MED - TEGRA_SOCTHERM_THROT_LEVEL_HIGH, TEGRA_SOCTHERM_THROT_LEVEL_NONE - - nvidia,gpu-throt-level: This property is for Tegra124 and Tegra210. - It is the level of pulse skippers, which used to throttle clock - frequencies. It indicates gpu clock throttling depth and can be - programmed to any of the following values which represent a throttling - percentage: - TEGRA_SOCTHERM_THROT_LEVEL_NONE (0%) - TEGRA_SOCTHERM_THROT_LEVEL_LOW (50%), - TEGRA_SOCTHERM_THROT_LEVEL_MED (75%), - TEGRA_SOCTHERM_THROT_LEVEL_HIGH (85%). - - #cooling-cells: Should be 1. This cooling device only support on/off state. - For a description of this property see: - Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml - - Optional properties: The following properties are T210 specific and - valid only for OCx throttle events. - - nvidia,count-threshold: Specifies the number of OC events that are - required for triggering an interrupt. Interrupts are not triggered if - the property is missing. A value of 0 will interrupt on every OC alarm. - - nvidia,polarity-active-low: Configures the polarity of the OC alaram - signal. If present, this means assert low, otherwise assert high. - - nvidia,alarm-filter: Number of clocks to filter event. When the filter - expires (which means the OC event has not occurred for a long time), - the counter is cleared and filter is rearmed. Default value is 0. - - nvidia,throttle-period-us: Specifies the number of uSec for which - throttling is engaged after the OC event is deasserted. Default value - is 0. - -Optional properties: -- nvidia,thermtrips : When present, this property specifies the temperature at - which the soctherm hardware will assert the thermal trigger signal to the - Power Management IC, which can be configured to reset or shutdown the device. - It is an array of pairs where each pair represents a tsensor id followed by a - temperature in milli Celcius. In the absence of this property the critical - trip point will be used for thermtrip temperature. - -Note: -- the "critical" type trip points will be used to set the temperature at which -the SOC_THERM hardware will assert a thermal trigger if the "nvidia,thermtrips" -property is missing. When the thermtrips property is present, the breach of a -critical trip point is reported back to the thermal framework to implement -software shutdown. - -- the "hot" type trip points will be set to SOC_THERM hardware as the throttle -temperature. Once the temperature of this thermal zone is higher -than it, it will trigger the HW throttle event. - -Example : - - soctherm@700e2000 { - compatible = "nvidia,tegra124-soctherm"; - reg = <0x0 0x700e2000 0x0 0x600 /* SOC_THERM reg_base */ - 0x0 0x60006000 0x0 0x400 /* CAR reg_base */ - reg-names = "soctherm-reg", "car-reg"; - interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>; - clocks = <&tegra_car TEGRA124_CLK_TSENSOR>, - <&tegra_car TEGRA124_CLK_SOC_THERM>; - clock-names = "tsensor", "soctherm"; - resets = <&tegra_car 78>; - reset-names = "soctherm"; - - #thermal-sensor-cells = <1>; - - nvidia,thermtrips = <TEGRA124_SOCTHERM_SENSOR_CPU 102500 - TEGRA124_SOCTHERM_SENSOR_GPU 103000>; - - throttle-cfgs { - /* - * When the "heavy" cooling device triggered, - * the HW will skip cpu clock's pulse in 85% depth, - * skip gpu clock's pulse in 85% level - */ - throttle_heavy: heavy { - nvidia,priority = <100>; - nvidia,cpu-throt-percent = <85>; - nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>; - - #cooling-cells = <1>; - }; - - /* - * When the "light" cooling device triggered, - * the HW will skip cpu clock's pulse in 50% depth, - * skip gpu clock's pulse in 50% level - */ - throttle_light: light { - nvidia,priority = <80>; - nvidia,cpu-throt-percent = <50>; - nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_LOW>; - - #cooling-cells = <1>; - }; - - /* - * If these two devices are triggered in same time, the HW throttle - * arbiter will select the highest priority as the final throttle - * settings to skip cpu pulse. - */ - - throttle_oc1: oc1 { - nvidia,priority = <50>; - nvidia,polarity-active-low; - nvidia,count-threshold = <100>; - nvidia,alarm-filter = <5100000>; - nvidia,throttle-period-us = <0>; - nvidia,cpu-throt-percent = <75>; - nvidia,gpu-throt-level = - <TEGRA_SOCTHERM_THROT_LEVEL_MED>; - }; - }; - }; - -Example: referring to Tegra132's "reg", "reg-names" and "throttle-cfgs" : - - soctherm@700e2000 { - compatible = "nvidia,tegra132-soctherm"; - reg = <0x0 0x700e2000 0x0 0x600 /* SOC_THERM reg_base */ - 0x0 0x70040000 0x0 0x200>; /* CCROC reg_base */; - reg-names = "soctherm-reg", "ccroc-reg"; - - throttle-cfgs { - /* - * When the "heavy" cooling device triggered, - * the HW will skip cpu clock's pulse in HIGH level - */ - throttle_heavy: heavy { - nvidia,priority = <100>; - nvidia,cpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>; - - #cooling-cells = <1>; - }; - - /* - * When the "light" cooling device triggered, - * the HW will skip cpu clock's pulse in MED level - */ - throttle_light: light { - nvidia,priority = <80>; - nvidia,cpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_MED>; - - #cooling-cells = <1>; - }; - - /* - * If these two devices are triggered in same time, the HW throttle - * arbiter will select the highest priority as the final throttle - * settings to skip cpu pulse. - */ - - }; - }; - -Example: referring to thermal sensors : - - thermal-zones { - cpu { - polling-delay-passive = <1000>; - polling-delay = <1000>; - - thermal-sensors = - <&soctherm TEGRA124_SOCTHERM_SENSOR_CPU>; - - trips { - cpu_shutdown_trip: shutdown-trip { - temperature = <102500>; - hysteresis = <1000>; - type = "critical"; - }; - - cpu_throttle_trip: throttle-trip { - temperature = <100000>; - hysteresis = <1000>; - type = "hot"; - }; - }; - - cooling-maps { - map0 { - trip = <&cpu_throttle_trip>; - cooling-device = <&throttle_heavy 1 1>; - }; - }; - }; - }; |