From patchwork Thu Mar 5 12:56:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Kucheria X-Patchwork-Id: 11421813 X-Patchwork-Delegate: daniel.lezcano@linaro.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5548C18B8 for ; Thu, 5 Mar 2020 12:57:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1BEAB2072D for ; Thu, 5 Mar 2020 12:57:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="p86SMEFr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726702AbgCEM5D (ORCPT ); Thu, 5 Mar 2020 07:57:03 -0500 Received: from mail-pj1-f67.google.com ([209.85.216.67]:53142 "EHLO mail-pj1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726676AbgCEM5C (ORCPT ); Thu, 5 Mar 2020 07:57:02 -0500 Received: by mail-pj1-f67.google.com with SMTP id lt1so2467763pjb.2 for ; Thu, 05 Mar 2020 04:57:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=jRlUncaH+JbfpzbykeZUqo1ECa5C+qSIDXtQ4Uv6t6U=; b=p86SMEFrZyVIA/egXTcVNPeHiuo9PQHR5U4x5w1koSHSJ0eMmrWDwwhYuyF1Grjlnf Sgn5u1mp7wZGOIhLBmMR7qSactHvwoQ9X1L9uRuaENEx91owCXbRxZOarzWdPXjwskP9 CYbgyuKwD/+lUvhDOuf3ZLd+LrWlVHD9Dy/QkECPIwRMm9vf2NIbfR/qS+ay+zfBTjyq rxOBu1xV0BrHJxdr7Kt5rpAdhT8E//KAn8p7162GsjgPBeYzlhlOH6EgWTXSxJzUHDkY RvvTd7sPOH7byyAuonwNUvdOiNSrItRFQ7r9oHW1QTHZ2VYoVlb+in80RCToKi4xPXGo BkZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=jRlUncaH+JbfpzbykeZUqo1ECa5C+qSIDXtQ4Uv6t6U=; b=PHy0rjvKzc2A/vjC5lqO3S26b5ni2KXYy9+8oFV4hr3viBzeQEO1eXIAOJtrYgNN0Q nZfwBAqWpUDv3y4x3bq8FG9w6YROQEAvSjdEjKvYZOEl+jayLgdKucyc5Edbfw0oQIlj 8f/rQrgWXEcgzaM9qvEJKGVKjD0gsvvq6P1nHalOoqhov8+PZ4bxWIgcWyyH91oVTVVh zLpEu8OVtavWd/yrVDQu5dEbEgPHZhbEiaXPjSaXAnYtfldDhEdj1E6iuq0J/nF4H6Cn kQfSKIoCxN5FGQBudvD8krNnfU/IJ70Fqr6zmGNljgJFHNW3oEHFZ02s0ZDFxTb0NyRc fiiw== X-Gm-Message-State: ANhLgQ3gsAv2I6ps2vbsZzhxvb0wPIUzOEAAzyMvYofo1iRpmJ46lr4m iImdzBxKcQqw67lJWApCmWUfRQ== X-Google-Smtp-Source: ADFU+vs8Qha1XeeXZZA19WT2v6N385wbYLD4vydtcleubJ7KnAHk1Hsb8SexOspFuxRmA6UDqdDRDQ== X-Received: by 2002:a17:90a:d104:: with SMTP id l4mr8913840pju.60.1583413021112; Thu, 05 Mar 2020 04:57:01 -0800 (PST) Received: from localhost ([103.195.202.216]) by smtp.gmail.com with ESMTPSA id gc22sm6459965pjb.0.2020.03.05.04.56.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2020 04:57:00 -0800 (PST) From: Amit Kucheria To: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, swboyd@chromium.org, mka@chromium.org, daniel.lezcano@linaro.org, Amit Kucheria , Zhang Rui Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 3/3] dt-bindings: thermal: Add yaml bindings for thermal zones Date: Thu, 5 Mar 2020 18:26:43 +0530 Message-Id: <8a0cfe9e3018f7996c1563035bee76048941beb4.1583412540.git.amit.kucheria@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org As part of moving the thermal bindings to YAML, split it up into 3 bindings: thermal sensors, cooling devices and thermal zones. The thermal-zone binding is a software abstraction to capture the properties of each zone - how often they should be checked, the temperature thresholds (trips) at which mitigation actions need to be taken and the level of mitigation needed at those thresholds. Signed-off-by: Amit Kucheria --- .../bindings/thermal/thermal-zones.yaml | 325 ++++++++++++++++++ 1 file changed, 325 insertions(+) create mode 100644 Documentation/devicetree/bindings/thermal/thermal-zones.yaml diff --git a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml new file mode 100644 index 0000000000000..f8f3b72bc3119 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml @@ -0,0 +1,325 @@ +# SPDX-License-Identifier: (GPL-2.0) +# Copyright 2020 Linaro Ltd. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/thermal/thermal-zones.yaml# +$schema: http://devicetree.org/meta-schemas/base.yaml# + +title: Thermal zone binding + +maintainers: + - Amit Kucheria + +description: | + Thermal management is achieved in devicetree by describing the sensor hardware + and the software abstraction of cooling devices and thermal zones required to + take appropriate action to mitigate thermal overloads. + + The following node types are used to completely describe a thermal management + system in devicetree: + - thermal-sensor: device that measures temperature, has SoC-specific bindings + - cooling-device: device used to dissipate heat either passively or actively + - thermal-zones: a container of the following node types used to describe all + thermal data for the platform + + This binding describes the thermal-zones. + + The polling-delay properties of a thermal-zone are bound to the maximum dT/dt + (temperature derivative over time) in two situations for a thermal zone: + 1. when passive cooling is activated (polling-delay-passive) + 2. when the zone just needs to be monitored (polling-delay) or when + active cooling is activated. + + The maximum dT/dt is highly bound to hardware power consumption and + dissipation capability. The delays should be chosen to account for said + max dT/dt, such that a device does not cross several trip boundaries + unexpectedly between polls. Choosing the right polling delays shall avoid + having the device in temperature ranges that may damage the silicon structures + and reduce silicon lifetime. + +properties: + thermal-zones: + type: object + description: + A /thermal-zones node is required in order to use the thermal framework to + manage input from the various thermal zones in the system in order to + mitigate thermal overload conditions. It does not represent a real device + in the system, but acts as a container to link thermal sensor devices, + platform-data regarding temperature thresholds and the mitigation actions + to take when the temperature crosses those thresholds. + + properties: + $nodename: + pattern: "^[a-zA-Z][a-zA-Z0-9,\\-]{1,12}-thermal$" + type: object + description: + Each thermal zone node contains information about how frequently it + must be checked, the sensor responsible for reporting temperature for + this zone, one sub-node containing the various trip points for this + zone and one sub-node containing all the zone cooling-maps. + + properties: + polling-delay: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + description: + The maximum number of milliseconds to wait between polls when + checking this thermal zone. Setting this to 0 disables the polling + timers setup by the thermal framework and assumes that the thermal + sensors in this zone support interrupts. + + polling-delay-passive: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + description: + The maximum number of milliseconds to wait between polls when + checking this thermal zone while doing passive cooling. Setting + this to 0 disables the polling timers setup by the thermal + framework and assumes that the thermal sensors in this zone + support interrupts. + + thermal-sensors: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + A list of thermal sensor phandles and sensor specifiers used to + monitor this thermal zone. + + trips: + type: object + description: + This node describes a set of points in the temperature domain at + which the thermal framework needs to takes action. The actions to + be taken are defined in another node called cooling-maps. + + patternProperties: + "^[a-zA-Z][a-zA-Z0-9,+\\._]{0,63}$": + type: object + + properties: + temperature: + $ref: /schemas/types.yaml#/definitions/int32 + minimum: -273000 + maximum: 200000 + description: + An integer expressing the trip temperature in millicelsius. + + hysteresis: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + An unsigned integer expressing the hysteresis delta with + respect to the trip temperature property above, also in + millicelsius. + + type: + enum: + # active: enable active cooling e.g. fans + - active + # passive: enable passive cooling e.g. throttling cpu + - passive + # hot: send notification to driver if .notify + # callback registered + - hot + # critical: send notification to driver if .notify + # callback registered and trigger a shutdown + - critical + description: | + There are four valid trip types: active, passive, hot, + critical. + + The critical trip type is used to set the maximum + temperature threshold above which the HW becomes + unstable and underlying firmware might even trigger a + reboot. Hitting the critical threshold triggers a system + shutdown. + + The hot trip type can be used to send a notification to + the thermal driver (if a .notify callback is registered). + The action to be taken is left to the driver. + + The passive trip type can be used to slow down HW e.g. run + the CPU, GPU, bus at a lower frequency. + + The active trip type can be used to control other HW to + help in cooling e.g. fans can be sped up or slowed down + + required: + - temperature + - hysteresis + - type + + additionalProperties: false + + cooling-maps: + type: object + description: + This node describes the action to be taken when a thermal zone + crosses one of the temperature thresholds described in the trips + node. The action takes the form of a mapping relation between a + trip and the target cooling device state. + + patternProperties: + "^map[0-9][-a-zA-Z0-9]*$": + type: object + + properties: + trip: + $ref: /schemas/types.yaml#/definitions/phandle + description: + A phandle of a trip point node within this thermal zone. + + cooling-device: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + A list of cooling device phandles along with the minimum + and maximum cooling state specifiers for each cooling + device. Using the THERMAL_NO_LIMIT (-1UL) constant in the + cooling-device phandle limit specifier lets the framework + use the minimum and maximum cooling state for that cooling + device automatically. + + contribution: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 100 + description: + The contribution of the cooling devices at the trip + temperature, both referenced in this map, to this thermal + zone as a percentage. + + required: + - trip + - cooling-device + + additionalProperties: false + +examples: + - | + #include + #include + + // Example 1: SDM845 TSENS + soc: soc@0 { + #address-cells = <2>; + #size-cells = <2>; + + /* ... */ + + tsens0: thermal-sensor@c263000 { + compatible = "qcom,sdm845-tsens", "qcom,tsens-v2"; + reg = <0 0x0c263000 0 0x1ff>, /* TM */ + <0 0x0c222000 0 0x1ff>; /* SROT */ + #qcom,sensors = <13>; + interrupts = , + ; + interrupt-names = "uplow", "critical"; + #thermal-sensor-cells = <1>; + }; + + tsens1: thermal-sensor@c265000 { + compatible = "qcom,sdm845-tsens", "qcom,tsens-v2"; + reg = <0 0x0c265000 0 0x1ff>, /* TM */ + <0 0x0c223000 0 0x1ff>; /* SROT */ + #qcom,sensors = <8>; + interrupts = , + ; + interrupt-names = "uplow", "critical"; + #thermal-sensor-cells = <1>; + }; + }; + + /* ... */ + + thermal-zones { + cpu0-thermal { + polling-delay-passive = <250>; + polling-delay = <1000>; + + thermal-sensors = <&tsens0 1>; + + trips { + cpu0_alert0: trip-point0 { + temperature = <90000>; + hysteresis = <2000>; + type = "passive"; + }; + + cpu0_alert1: trip-point1 { + temperature = <95000>; + hysteresis = <2000>; + type = "passive"; + }; + + cpu0_crit: cpu_crit { + temperature = <110000>; + hysteresis = <1000>; + type = "critical"; + }; + }; + + cooling-maps { + map0 { + trip = <&cpu0_alert0>; + cooling-device = <&CPU0 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>, + <&CPU1 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>, + <&CPU2 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>, + <&CPU3 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>; + }; + + map1 { + trip = <&cpu0_alert1>; + cooling-device = <&CPU0 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>, + <&CPU1 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>, + <&CPU2 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>, + <&CPU3 THERMAL_NO_LIMIT + THERMAL_NO_LIMIT>; + }; + }; + }; + + /* ... */ + + cluster0-thermal { + polling-delay-passive = <250>; + polling-delay = <1000>; + + thermal-sensors = <&tsens0 5>; + + trips { + cluster0_alert0: trip-point0 { + temperature = <90000>; + hysteresis = <2000>; + type = "hot"; + }; + cluster0_crit: cluster0_crit { + temperature = <110000>; + hysteresis = <2000>; + type = "critical"; + }; + }; + }; + + /* ... */ + + gpu-thermal-top { + polling-delay-passive = <250>; + polling-delay = <1000>; + + thermal-sensors = <&tsens0 11>; + + trips { + gpu1_alert0: trip-point0 { + temperature = <90000>; + hysteresis = <2000>; + type = "hot"; + }; + }; + }; + }; +...