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/Documentation/hwmon/
Docc.rst1 Kernel driver occ-hwmon
12 -----------
14 This driver supports hardware monitoring for the On-Chip Controller (OCC)
15 embedded on POWER processors. The OCC is a device that collects and aggregates
17 sensor data as well as perform thermal and power management on the system.
20 manually if an "ibm,p8-occ-hwmon" compatible device is found under the
21 appropriate I2C bus node in the device-tree.
23 The P9 version of this driver is a client driver of the FSI-based OCC driver.
24 It will be probed automatically by the FSI-based OCC driver.
27 -------------
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Dacpi_power_meter.rst4 This driver talks to ACPI 4.0 power meters.
17 -----------
19 This driver implements sensor reading support for the power meters exposed in
21 features--a power meter that returns average power use over a configurable
23 sysfs interface conforms with the specification outlined in the "Power" section
24 of Documentation/hwmon/sysfs-interface.rst.
27 ----------------
29 The `power[1-*]_is_battery` knob indicates if the power supply is a battery.
30 Both `power[1-*]_average_{min,max}` must be set before the trip points will work.
31 When both of them are set, an ACPI event will be broadcast on the ACPI netlink
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Dxgene-hwmon.rst1 Kernel driver xgene-hwmon
6 * APM X-Gene SoC
9 -----------
11 This driver adds hardware temperature and power reading support for
12 APM X-Gene SoC using the mailbox communication interface.
19 - SoC on-die temperature in milli-degree C
20 - Alarm when high/over temperature occurs
22 * Power
23 - CPU power in uW
24 - IO power in uW
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Ducd9000.rst10 Addresses scanned: -
14 - http://focus.ti.com/lit/ds/symlink/ucd90120.pdf
15 - http://focus.ti.com/lit/ds/symlink/ucd90124.pdf
16 - http://focus.ti.com/lit/ds/symlink/ucd90160.pdf
17 - http://focus.ti.com/lit/ds/symlink/ucd9090.pdf
18 - http://focus.ti.com/lit/ds/symlink/ucd90910.pdf
20 Author: Guenter Roeck <linux@roeck-us.net>
24 -----------
28 The UCD90120 Power Supply Sequencer and System Health Monitor monitors and
29 sequences up to 12 independent voltage rails. The device integrates a 12-bit
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/Documentation/driver-api/thermal/
Dpower_allocator.rst2 Power allocator governor tunables
6 -----------
10 1. "switch on" trip point: temperature above which the governor
15 "switch on" trip point. This the target temperature the governor
20 --------------
22 The power allocator governor implements a
23 Proportional-Integral-Derivative controller (PID controller) with
24 temperature as the control input and power as the controlled output:
29 - e = desired_temperature - current_temperature
30 - err_integral is the sum of previous errors
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Dcpu-cooling-api.rst22 --------------------------------------------
30 "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
42 the name "thermal-cpufreq-%x" linking it with a device tree node, in
54 This interface function unregisters the "thermal-cpufreq-%x" cooling device.
58 2. Power models
61 The power API registration functions provide a simple power model for
62 CPUs. The current power is calculated as dynamic power (static power isn't
63 supported currently). This power model requires that the operating-points of
70 The dynamic power consumption of a processor depends on many factors.
73 - The time the processor spends running, consuming dynamic power, as
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/Documentation/devicetree/bindings/mfd/
Dtwl4030-power.txt1 Texas Instruments TWL family (twl4030) reset and power management module
3 The power management module inside the TWL family provides several facilities
4 to control the power resources, including power scripts. For now, the
8 - compatible : must be one of the following
9 "ti,twl4030-power"
10 "ti,twl4030-power-reset"
11 "ti,twl4030-power-idle"
12 "ti,twl4030-power-idle-osc-off"
14 The use of ti,twl4030-power-reset is recommended at least on
17 When using ti,twl4030-power-idle, the TI recommended configuration
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Dmax77620.txt1 MAX77620 Power management IC from Maxim Semiconductor.
4 -------------------
5 - compatible: Must be one of
9 - reg: I2C device address.
12 -------------------
13 - interrupts: The interrupt on the parent the controller is
15 - interrupt-controller: Marks the device node as an interrupt controller.
16 - #interrupt-cells: is <2> and their usage is compliant to the 2 cells
17 variant of <../interrupt-controller/interrupts.txt>
19 are defined at dt-bindings/mfd/max77620.h.
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/Documentation/devicetree/bindings/arm/tegra/
Dnvidia,tegra20-pmc.txt1 NVIDIA Tegra Power Management Controller (PMC)
3 == Power Management Controller Node ==
5 The PMC block interacts with an external Power Management Unit. The PMC
7 modes. It provides power-gating controllers for SoC and CPU power-islands.
10 - name : Should be pmc
11 - compatible : Should contain one of the following:
12 For Tegra20 must contain "nvidia,tegra20-pmc".
13 For Tegra30 must contain "nvidia,tegra30-pmc".
14 For Tegra114 must contain "nvidia,tegra114-pmc"
15 For Tegra124 must contain "nvidia,tegra124-pmc"
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Dnvidia,tegra186-pmc.txt1 NVIDIA Tegra Power Management Controller (PMC)
4 - compatible: Should contain one of the following:
5 - "nvidia,tegra186-pmc": for Tegra186
6 - "nvidia,tegra194-pmc": for Tegra194
7 - reg: Must contain an (offset, length) pair of the register set for each
8 entry in reg-names.
9 - reg-names: Must include the following entries:
10 - "pmc"
11 - "wake"
12 - "aotag"
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/Documentation/sound/designs/
Dpowersave.rst2 Notes on Power-Saving Mode
5 AC97 and HD-audio drivers have the automatic power-saving mode.
9 With the automatic power-saving, the driver turns off the codec power
11 the device and/or no analog loopback is set, the power disablement is
12 done fully or partially. It'll save a certain power consumption, thus
15 The time-out for automatic power-off can be specified via ``power_save``
16 module option of snd-ac97-codec and snd-hda-intel modules. Specify
17 the time-out value in seconds. 0 means to disable the automatic
18 power-saving. The default value of timeout is given via
26 adjust the value via sysfs on the fly. For example, to turn on the
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/Documentation/devicetree/bindings/input/
Dti,palmas-pwrbutton.txt1 Texas Instruments Palmas family power button module
7 This module provides a simple power button event via an Interrupt.
10 - compatible: should be one of the following
11 - "ti,palmas-pwrbutton": For Palmas compatible power on button
12 - interrupts: Interrupt number of power button submodule on device.
16 - ti,palmas-long-press-seconds: Duration in seconds which the power
17 button should be kept pressed for Palmas to power off automatically.
18 NOTE: This depends on OTP support and POWERHOLD signal configuration
19 on platform. Valid values are 6, 8, 10 and 12.
20 - ti,palmas-pwron-debounce-milli-seconds: Duration in milliseconds
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/Documentation/devicetree/bindings/sound/
Dst,sta350.txt7 - compatible: "st,sta350"
8 - reg: the I2C address of the device for I2C
9 - reset-gpios: a GPIO spec for the reset pin. If specified, it will be
12 - power-down-gpios: a GPIO spec for the power down pin. If specified,
16 - vdd-dig-supply: regulator spec, providing 3.3V
17 - vdd-pll-supply: regulator spec, providing 3.3V
18 - vcc-supply: regulator spec, providing 5V - 26V
22 - st,output-conf: number, Selects the output configuration:
23 0: 2-channel (full-bridge) power, 2-channel data-out
24 1: 2 (half-bridge). 1 (full-bridge) on-board power
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/Documentation/networking/device_drivers/intel/
Dipw2100.txt6 Copyright (C) 2003-2006, Intel Corporation
10 Version: git-1.1.5
14 -----------------------------------------------
17 2. Release git-1.1.5 Current Features
22 7. Power Management
28 -----------------------------------------------
45 parameters include, without limitation, RF power, spectrum usage,
58 the warranty and/or issues arising from regulatory non-compliance, and
63 modules, and accordingly, condition system-level regulatory approval
66 non-compliant.
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/Documentation/trace/
Dcoresight-cpu-debug.rst9 ------------
11 Coresight CPU debug module is defined in ARMv8-a architecture reference manual
13 debug module and it is mainly used for two modes: self-hosted debug and
15 debugger connects with SoC from JTAG port; on the other hand the program can
16 explore debugging method which rely on self-hosted debug mode, this document
17 is to focus on this part.
19 The debug module provides sample-based profiling extension, which can be used
21 every CPU has one dedicated debug module to be connected. Based on self-hosted
29 --------------
31 - During driver registration, it uses EDDEVID and EDDEVID1 - two device ID
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/Documentation/driver-api/pm/
Ddevices.rst1 .. SPDX-License-Identifier: GPL-2.0
15 Device Power Management Basics
18 :Copyright: |copy| 2010-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
25 Most of the code in Linux is device drivers, so most of the Linux power
26 management (PM) code is also driver-specific. Most drivers will do very
30 This writeup gives an overview of how drivers interact with system-wide
31 power management goals, emphasizing the models and interfaces that are
33 background for the domain-specific work you'd do with any specific driver.
36 Two Models for Device Power Management
39 Drivers will use one or both of these models to put devices into low-power
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/Documentation/devicetree/bindings/phy/
Dti-phy.txt6 - compatible: Should be one of
7 "ti,control-phy-otghs" - if it has otghs_control mailbox register as on OMAP4.
8 "ti,control-phy-usb2" - if it has Power down bit in control_dev_conf register
9 e.g. USB2_PHY on OMAP5.
10 "ti,control-phy-pipe3" - if it has DPLL and individual Rx & Tx power control
11 e.g. USB3 PHY and SATA PHY on OMAP5.
12 "ti,control-phy-pcie" - for pcie to support external clock for pcie and to
15 "ti,control-phy-usb2-dra7" - if it has power down register like USB2 PHY on
17 "ti,control-phy-usb2-am437" - if it has power down register like USB2 PHY on
19 - reg : register ranges as listed in the reg-names property
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/Documentation/ABI/testing/
Dsysfs-devices-power1 What: /sys/devices/.../power/
5 The /sys/devices/.../power directory contains attributes
6 allowing the user space to check and modify some power
9 What: /sys/devices/.../power/wakeup
13 The /sys/devices/.../power/wakeup attribute allows the user
21 have one of the following two values for the sysfs power/wakeup
35 What: /sys/devices/.../power/control
39 The /sys/devices/.../power/control attribute allows the user
40 space to control the run-time power management of the device.
43 power/control file:
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Dsysfs-driver-bd9571mwv-regulator1 What: /sys/bus/i2c/devices/.../bd9571mwv-regulator.*.auto/backup_mode
6 if DDR power rails will be kept powered during system suspend.
7 ("on"/"1" = enabled, "off"/"0" = disabled).
8 Two types of power switches (or control signals) can be used:
9 A. With a momentary power switch (or pulse signal), DDR
12 B. With a toggle power switch (or level signal), the
15 the accessory power switch from a power switch to a
16 wake-up switch,
17 2. Switch accessory power switch off, to prepare for
21 4. Switch accessory power switch on, to resume the
/Documentation/admin-guide/pm/
Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
21 Depending on its configuration and the capabilities of the platform it runs on,
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
38 The system is woken up from this state by in-band interrupts, so theoretically
42 This state can be used on platforms without support for :ref:`standby <standby>`
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
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/Documentation/driver-api/usb/
Dpower-management.rst1 .. _usb-power-management:
3 Power Management for USB
7 :Date: Last-updated: February 2014
11 ---------
12 * What is Power Management?
17 * Changing the default idle-delay time
19 * The driver interface for Power Management
25 * USB Port Power Control
26 * User Interface for Port Power Control
27 * Suggested Userspace Port Power Policy
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/Documentation/ABI/obsolete/
Dsysfs-bus-usb1 What: /sys/bus/usb/devices/.../power/level
7 power/level. This file holds a power-level setting for
8 the device, either "on" or "auto".
10 "on" means that the device is not allowed to autosuspend,
17 level. The "on" level is meant for administrative uses.
20 write "0" to power/autosuspend.
23 left in the "on" level. Although the USB spec requires
26 initializes all non-hub devices in the "on" level. Some
30 Use the power/control file instead; it does exactly the
/Documentation/devicetree/bindings/power/
Drenesas,sysc-rmobile.txt1 DT bindings for the Renesas R-Mobile System Controller
5 The R-Mobile System Controller provides the following functions:
6 - Boot mode management,
7 - Reset generation,
8 - Power management.
11 - compatible: Should be "renesas,sysc-<soctype>", "renesas,sysc-rmobile" as
14 - "renesas,sysc-r8a73a4" (R-Mobile APE6)
15 - "renesas,sysc-r8a7740" (R-Mobile A1)
16 - "renesas,sysc-sh73a0" (SH-Mobile AG5)
17 - reg: Two address start and address range blocks for the device:
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/Documentation/sound/soc/
Doverview.rst5 The overall project goal of the ALSA System on Chip (ASoC) layer is to
6 provide better ALSA support for embedded system-on-chip processors (e.g.
9 had some limitations:-
12 CPU. This is not ideal and leads to code duplication - for example,
17 event). These are quite common events on portable devices and often require
18 machine specific code to re-route audio, enable amps, etc., after such an
21 * Drivers tended to power up the entire codec when playing (or
23 power on portable devices. There was also no support for saving
24 power via changing codec oversampling rates, bias currents, etc.
31 features :-
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/Documentation/devicetree/bindings/media/i2c/
Dadv7343.txt3 The ADV7343 are high speed, digital-to-analog video encoders in a 64-lead LQFP
4 package. Six high speed, 3.3 V, 11-bit video DACs provide support for composite
5 (CVBS), S-Video (Y-C), and component (YPrPb/RGB) analog outputs in standard
10 - compatible: Must be "adi,adv7343"
13 - adi,power-mode-sleep-mode: on enable the current consumption is reduced to
16 - adi,power-mode-pll-ctrl: PLL and oversampling control. This control allows
19 - ad,adv7343-power-mode-dac: array configuring the power on/off DAC's 1..6,
20 0 = OFF and 1 = ON, Default value when this
22 - ad,adv7343-sd-config-dac-out: array configure SD DAC Output's 1 and 2, 0 = OFF
23 and 1 = ON, Default value when this property is
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