Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753214AbcD0DY7 (ORCPT ); Tue, 26 Apr 2016 23:24:59 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:7148 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752688AbcD0DYy (ORCPT ); Tue, 26 Apr 2016 23:24:54 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Tue, 26 Apr 2016 20:24:32 -0700 From: Wei Ni To: , , , CC: , , , , , , , Wei Ni Subject: [PATCH v2 4/9] of: Add bindings of hw throttle for soctherm Date: Wed, 27 Apr 2016 11:25:49 +0800 Message-ID: <1461727554-15065-5-git-send-email-wni@nvidia.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1461727554-15065-1-git-send-email-wni@nvidia.com> References: <1461727554-15065-1-git-send-email-wni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5493 Lines: 145 Add HW throttle configuration sub-node for soctherm, which is used to describe the throttle event, and worked as a cooling device. The "hot" type trip in thermal zone can be bound to this cooling device, and trigger the throttle function. Signed-off-by: Wei Ni --- .../bindings/thermal/nvidia,tegra124-soctherm.txt | 89 +++++++++++++++++++++- 1 file changed, 87 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt index edebfa0a985e..dc337d139f49 100644 --- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt +++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt @@ -10,8 +10,14 @@ 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 1 entry: +- 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. @@ -25,17 +31,44 @@ Required properties : - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description of this property. See 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: + - 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. + - cpu-throt-depth: This property is for Tegra124 and Tegra210. It is + the throttling depth of pulse skippers, it's the percentage + throttling. + - 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 + - #cooling-cells: Should be 1. This cooling device only support on/off state. + See ./thermal.txt for a description of this property. Note: - the "critical" type trip points will be set to SOC_THERM hardware as the shut down temperature. Once the temperature of this thermal zone is higher than it, the system will be shutdown or reset by hardware. +- the "hot" type trip points will be set to SOC_THERM hardware as the throttle +temperature. Once the 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 0x1000>; + reg = <0x0 0x700e2000 0x0 0x600 /* SOC_THERM reg_base */ + 0x0 0x60006000 0x0 0x400 /* CAR reg_base */ + reg-names = "soctherm-reg", "car-reg"; interrupts = ; clocks = <&tegra_car TEGRA124_CLK_TSENSOR>, <&tegra_car TEGRA124_CLK_SOC_THERM>; @@ -44,6 +77,45 @@ Example : reset-names = "soctherm"; #thermal-sensor-cells = <1>; + + throttle-cfgs { + throttle_heavy: heavy { + priority = <100>; + cpu-throt-depth = <85>; + + #cooling-cells = <1>; + }; + throttle_light: light { + priority = <80>; + cpu-throt-depth = <50>; + + #cooling-cells = <1>; + }; + }; + }; + +Example: referring to Tegra132's "reg", "reg-names" and "throttle-cfgs" : + + soctherm@0,700e2000 { + 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 { + throttle_heavy: heavy { + priority = <100>; + cpu-throt-level = ; + + #cooling-cells = <1>; + }; + throttle_light: light { + priority = <80>; + cpu-throt-level = ; + + #cooling-cells = <1>; + }; + }; }; Example: referring to thermal sensors : @@ -62,6 +134,19 @@ Example: referring to thermal sensors : 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>; + }; }; }; }; -- 1.9.1