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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
14 space to check if the device is enabled to wake up the system
21 have one of the following two values for the sysfs power/wakeup
33 be enabled to wake up the system from sleep states.
35 What: /sys/devices/.../power/control
39 The /sys/devices/.../power/control attribute allows the user
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/Documentation/hwmon/
Ducd9000.rst11 Addresses scanned: -
15 - http://focus.ti.com/lit/ds/symlink/ucd90120.pdf
16 - http://focus.ti.com/lit/ds/symlink/ucd90124.pdf
17 - http://focus.ti.com/lit/ds/symlink/ucd90160.pdf
18 - http://focus.ti.com/lit/ds/symlink/ucd90320.pdf
19 - http://focus.ti.com/lit/ds/symlink/ucd9090.pdf
20 - http://focus.ti.com/lit/ds/symlink/ucd90910.pdf
22 Author: Guenter Roeck <linux@roeck-us.net>
26 -----------
30 The UCD90120 Power Supply Sequencer and System Health Monitor monitors and
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Dmp2975.rst1 .. SPDX-License-Identifier: GPL-2.0
17 -----------
19 This driver implements support for Monolithic Power Systems, Inc. (MPS)
20 vendor dual-loop, digital, multi-phase controller MP2975.
24 - Supports up to two power rail.
25 - Provides 8 pulse-width modulations (PWMs), and can be configured up
26 to 8-phase operation for rail 1 and up to 4-phase operation for rail
28 - Supports two pages 0 and 1 for telemetry and also pages 2 and 3 for
30 - Can configured VOUT readout in direct or VID format and allows
32 protocols are available: VR13 mode with 5-mV DAC; VR13 mode with
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/Documentation/networking/pse-pd/
Dintroduction.rst1 .. SPDX-License-Identifier: GPL-2.0
3 Power Sourcing Equipment (PSE) in IEEE 802.3 Standard
7 --------
9 Power Sourcing Equipment (PSE) is essential in networks for delivering power
11 switches and hubs that supply power to Powered Devices (PDs) such as IP
15 ----------------
18 power alongside data over Ethernet cables, typically associated with Power over
21 PoDL PSE, or Power over Data Lines PSE, specifically denotes PSEs operating
22 with single balanced twisted-pair PHYs, as per Clause 104 of IEEE 802.3. PoDL
23 is significant in contexts like automotive and industrial controls where power
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/Documentation/arch/arm/
Dcluster-pm-race-avoidance.rst2 Cluster-wide Power-up/power-down race avoidance algorithm
16 ---------
20 power consumption and thermal dissipation.
29 cluster-level operations are only performed when it is truly safe to do
34 are not immediately enabled when a cluster powers up. Since enabling or
35 disabling those mechanisms may itself be a non-atomic operation (such as
38 power-down and power-up at the cluster level.
46 -----------
50 - DOWN
51 - COMING_UP
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/Documentation/devicetree/bindings/power/reset/
Datmel,sama5d2-shdwc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/reset/atmel,sama5d2-shdwc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Claudiu Beznea <claudiu.beznea@microchip.com>
13 Microchip AT91 SHDWC shutdown controller controls the power supplies VDDIO
14 and VDDCORE and the wake-up detection on debounced input lines.
19 - items:
20 - const: microchip,sama7g5-shdwc
21 - const: syscon
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Datmel,at91sam9260-shdwc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/reset/atmel,at91sam9260-shdwc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Claudiu Beznea <claudiu.beznea@microchip.com>
13 Microchip AT91 SHDWC shutdown controller controls the power supplies VDDIO
14 and VDDCORE and the wake-up detection on debounced input lines.
19 - atmel,at91sam9260-shdwc
20 - atmel,at91sam9rl-shdwc
21 - atmel,at91sam9x5-shdwc
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/Documentation/devicetree/bindings/power/
Dfsl,imx-gpcv2.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/fsl,imx-gpcv2.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Freescale i.MX General Power Controller v2
10 - Andrey Smirnov <andrew.smirnov@gmail.com>
13 The i.MX7S/D General Power Control (GPC) block contains Power Gating
14 Control (PGC) for various power domains.
16 Power domains contained within GPC node are generic power domain
18 Documentation/devicetree/bindings/power/power-domain.yaml, which are
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Dapple,pmgr-pwrstate.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/apple,pmgr-pwrstate.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Apple SoC PMGR Power States
10 - Hector Martin <marcan@marcan.st>
13 - $ref: power-domain.yaml#
16 Apple SoCs include PMGR blocks responsible for power management,
17 which can control various clocks, resets, power states, and
18 performance features. This binding describes the device power
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Dmediatek,power-controller.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/mediatek,power-controller.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Mediatek Power Domains Controller
10 - MandyJH Liu <mandyjh.liu@mediatek.com>
11 - Matthias Brugger <mbrugger@suse.com>
14 Mediatek processors include support for multiple power domains which can be
15 powered up/down by software based on different application scenes to save power.
17 IP cores belonging to a power domain should contain a 'power-domains'
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/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
22 the Linux kernel can support up to four system sleep states, including
23 hibernation and up to three variants of system suspend. The sleep states that
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
40 also be set up as wakeup devices for S2Idle.
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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
27 automatic power-save mode with 10 seconds, write to
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/Documentation/driver-api/
Dpwrseq.rst1 .. SPDX-License-Identifier: GPL-2.0-only
5 Power Sequencing API
13 This framework is designed to abstract complex power-up sequences that are
16 The intention is to allow consumers to obtain a power sequencing handle
17 exposed by the power sequence provider and delegate the actual requesting and
22 --------
24 The power sequencing API uses a number of terms specific to the subsystem:
28 A unit is a discreet chunk of a power sequence. For instance one unit may
37 to the power sequencer. Via the dependency system, multiple targets may
38 share the same parts of a power sequence but ignore parts that are
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/Documentation/devicetree/bindings/mfd/
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/pinctrl/
Dpinctrl-max77620.txt1 Pincontrol driver for MAX77620 Power management IC from Maxim Semiconductor.
6 Please refer file <devicetree/bindings/pinctrl/pinctrl-bindings.txt>
11 --------------------------
14 - pinctrl-names: A pinctrl state named per <pinctrl-bindings.txt>.
15 - pinctrl[0...n]: Properties to contain the phandle for pinctrl states per
16 <pinctrl-bindings.txt>.
19 sub-node have following properties:
22 ------------------
23 - pins: List of pins. Valid values of pins properties are:
27 -------------------
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/Documentation/sound/soc/
Doverview.rst6 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,
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 :-
41 * Dynamic Audio Power Management (DAPM). DAPM automatically sets the codec to
42 its minimum power state at all times. This includes powering up/down
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Dmachine.rst12 the following struct:-
33 /* CPU <--> Codec DAI links */
41 ----------------
46 ------------------
53 -------------------------
55 also be used to set up the DAI system clock and for any machine related DAI
59 struct snd_soc_dai_link is used to set up each DAI in your machine. e.g.
62 /* corgi digital audio interface glue - connects codec <--> CPU */
66 .cpu_dai_name = "pxa-is2-dai",
67 .codec_dai_name = "wm8731-hifi",
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/Documentation/devicetree/bindings/display/bridge/
Dps8640.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Nicolas Boichat <drinkcat@chromium.org>
13 The PS8640 is a low power MIPI-to-eDP video format converter supporting
14 mobile devices with embedded panel resolutions up to 2048 x 1536. The
15 device accepts a single channel of MIPI DSI v1.1, with up to four lanes
16 plus clock, at a transmission rate up to 1.5Gbit/sec per lane. The
17 device outputs eDP v1.4, one or two lanes, at a link rate of up to
28 powerdown-gpios:
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/Documentation/power/
Dcharger-manager.rst7 Charger Manager provides in-kernel battery charger management that
8 requires temperature monitoring during suspend-to-RAM state
12 Charger Manager is a platform_driver with power-supply-class entries.
13 An instance of Charger Manager (a platform-device created with Charger-Manager)
24 A system may have multiple chargers (or power sources) and some of
26 own power-supply-class and each power-supply-class can provide
28 aggregates charger-related information from multiple sources and
29 shows combined information as a single power-supply-class.
31 * Support for in suspend-to-RAM polling (with suspend_again callback)
32 While the battery is being charged and the system is in suspend-to-RAM,
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Dswsusp-dmcrypt.rst2 How to use dm-crypt and swsusp together
10 You know how dm-crypt works. If not, visit the following web page:
11 http://www.saout.de/misc/dm-crypt/
12 You have read Documentation/power/swsusp.rst and understand it.
13 You did read Documentation/admin-guide/initrd.rst and know how an initrd works.
16 Now your system is properly set up, your disk is encrypted except for
26 up dm-crypt and then asks swsusp to resume from the encrypted
29 The most important thing is that you set up dm-crypt in such
33 to always set up this swap device first with dmsetup, so that
36 brw------- 1 root root 254, 0 Jul 28 13:37 /dev/mapper/swap0
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/Documentation/devicetree/bindings/rtc/
Dbrcm,brcmstb-waketimer.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/brcm,brcmstb-waketimer.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Broadcom STB wake-up Timer
10 - Florian Fainelli <f.fainelli@gmail.com>
13 The Broadcom STB wake-up timer provides a 27Mhz resolution timer, with the
14 ability to wake up the system from low-power suspend/standby modes and
18 - $ref: rtc.yaml#
22 const: brcm,brcmstb-waketimer
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/Documentation/driver-api/thermal/
Dcpu-idle-cooling.rst1 .. SPDX-License-Identifier: GPL-2.0
8 ----------
13 act on a cooling device to mitigate the dissipated power. When the
20 to the static leakage. The only solution is to power down the
24 Last but not least, the system can ask for a specific power budget but
25 because of the OPP density, we can only choose an OPP with a power
26 budget lower than the requested one and under-utilize the CPU, thus
27 losing performance. In other words, one OPP under-utilizes the CPU
28 with a power less than the requested power budget and the next OPP
29 exceeds the power budget. An intermediate OPP could have been used if
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/Documentation/input/devices/
Djoystick-parport.rst3 .. _joystick-parport:
9 :Copyright: |copy| 1998-2000 Vojtech Pavlik <vojtech@ucw.cz>
10 :Copyright: |copy| 1998 Andree Borrmann <a.borrmann@tu-bs.de>
18 Any information in this file is provided as-is, without any guarantee that
36 Many console and 8-bit computer gamepads and joysticks are supported. The
40 ------------
49 the computer's side (and thus timing insensitive). To allow up to 5 NES
57 The main problem with PC parallel ports is that they don't have +5V power
58 source on any of their pins. So, if you want a reliable source of power
59 for your pads, use either keyboard or joystick port, and make a pass-through
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/Documentation/devicetree/bindings/display/
Drenesas,cmm.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Renesas R-Car Color Management Module (CMM)
10 - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
11 - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
12 - Jacopo Mondi <jacopo+renesas@jmondi.org>
15 Renesas R-Car color management module connected to R-Car DU video channels.
16 It provides image enhancement functions such as 1-D look-up tables (LUT),
17 3-D look-up tables (CLU), 1D-histogram generation (HGO), and color
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/Documentation/devicetree/bindings/sound/
Drealtek,rt1015.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jack Yu <jack.yu@realtek.com>
15 - realtek,rt1015
20 realtek,power-up-delay-ms:
26 - compatible
27 - reg
32 - |
34 #address-cells = <1>;
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