| /linux/tools/power/cpupower/man/ |
| H A D | cpupower-idle-info.1 | 1 .TH "CPUPOWER-IDLE-INFO" "1" "0.1" "" "cpupower Manual"
4 cpupower\-idle\-info \- Utility to retrieve cpu idle kernel information
7 cpupower [ \-c cpulist ] idle\-info [\fIoptions\fP]
14 \fB\-f\fR \fB\-\-silent\fR
15 Only print a summary of all available C-states in the system.
17 \fB\-e\fR \fB\-\-proc\fR
23 .SH IDLE\-INFO DESCRIPTIONS
24 CPU sleep state statistics and descriptions are retrieved from sysfs files,
26 statistics when it enters or leaves an idle state, therefore on a very idle or
28 good overview about the usage and availability of processor sleep states on
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| H A D | cpupower-monitor.1 | 1 .TH CPUPOWER\-MONITOR "1" "22/02/2011" "" "cpupower Manual"
3 cpupower\-monitor \- Report processor frequency and idle statistics
7 .RB "\-l"
10 .RB [ -c ] [ "\-m <mon1>," [ "<mon2>,..." ] ]
11 .RB [ "\-i seconds" ]
14 .RB [ -c ][ "\-m <mon1>," [ "<mon2>,..." ] ]
18 \fBcpupower-monitor \fP reports processor topology, frequency and idle power
19 state statistics. Either \fBcommand\fP is forked and
22 \fBcpupower-monitor \fP implements independent processor sleep state and
24 directly reading out hardware registers. Use \-l to get an overview which are
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| /linux/Documentation/admin-guide/pm/ |
| H A D | suspend-flows.rst | 1 .. SPDX-License-Identifier: GPL-2.0
12 At least one global system-wide transition needs to be carried out for the
13 system to get from the working state into one of the supported
14 :doc:`sleep states <sleep-states>`. Hibernation requires more than one
15 transition to occur for this purpose, but the other sleep states, commonly
16 referred to as *system-wide suspend* (or simply *system suspend*) states, need
19 For those sleep states, the transition from the working state of the system into
20 the target sleep state is referred to as *system suspend* too (in the majority
21 of cases, whether this means a transition or a sleep state of the system should
22 be clear from the context) and the transition back from the sleep state into the
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| H A D | cpuidle.rst | 1 .. SPDX-License-Identifier: GPL-2.0
23 Since part of the processor hardware is not used in idle states, entering them
27 CPU idle time management is an energy-efficiency feature concerned about using
31 ------------
37 software as individual single-core processors. In other words, a CPU is an
43 program) at a time, it is a CPU. In that case, if the hardware is asked to
44 enter an idle state, that applies to the processor as a whole.
46 Second, if the processor is multi-core, each core in it is able to follow at
51 time. The entire cores are CPUs in that case and if the hardware is asked to
52 enter an idle state, that applies to the core that asked for it in the first
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| H A D | strategies.rst | 1 .. SPDX-License-Identifier: GPL-2.0
13 The Linux kernel supports two major high-level power management strategies.
15 One of them is based on using global low-power states of the whole system in
17 significantly reduced, referred to as :doc:`sleep states <sleep-states>`. The
20 designated devices, triggering a transition to the ``working state`` in which
21 user space code can run. Because sleep states are global and the whole system
22 is affected by the state changes, this strategy is referred to as the
23 :doc:`system-wide power management <system-wide>`.
25 The other strategy, referred to as the :doc:`working-state power management
26 <working-state>`, is based on adjusting the power states of individual hardware
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| /linux/Documentation/devicetree/bindings/pinctrl/ |
| H A D | sprd,sc9860-pinctrl.txt | 7 - compatible: Must be "sprd,sc9860-pinctrl".
8 - reg: The register address of pin controller device.
9 - pins : An array of strings, each string containing the name of a pin.
12 - function: A string containing the name of the function, values must be
14 - drive-strength: Drive strength in mA. Supported values: 2, 4, 6, 8, 10,
16 - input-schmitt-disable: Enable schmitt-trigger mode.
17 - input-schmitt-enable: Disable schmitt-trigger mode.
18 - bias-disable: Disable pin bias.
19 - bias-pull-down: Pull down on pin.
20 - bias-pull-up: Pull up on pin. Supported values: 20000 for pull-up resistor
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| H A D | sprd,pinctrl.txt | 16 of them, so we can not make every Spreadtrum-special configuration
29 to configure the pin sleep mode, function select and sleep related
32 Now we have 4 systems for sleep mode on SC9860 SoC: AP system,
33 PUBCP system, TGLDSP system and AGDSP system. And the pin sleep
35 - input-enable
36 - input-disable
37 - output-high
38 - output-low
39 - bias-pull-up
40 - bias-pull-down
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| H A D | pincfg-node.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/pinctrl/pincfg-node.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
16 for all hardware or binding structures. Each individual binding document
17 should state which of these generic properties, if any, are used, and the
21 bias-disable:
25 bias-high-impedance:
27 description: high impedance mode ("third-state", "floating")
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| /linux/Documentation/driver-api/pm/ |
| H A D | devices.rst | 1 .. SPDX-License-Identifier: GPL-2.0
10 :Copyright: |copy| 2010-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
18 management (PM) code is also driver-specific. Most drivers will do very
22 This writeup gives an overview of how drivers interact with system-wide
25 background for the domain-specific work you'd do with any specific driver.
31 Drivers will use one or both of these models to put devices into low-power
34 System Sleep model:
36 Drivers can enter low-power states as part of entering system-wide
37 low-power states like "suspend" (also known as "suspend-to-RAM"), or
39 "suspend-to-disk").
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| /linux/Documentation/locking/ |
| H A D | hwspinlock.rst | 2 Hardware Spinlock Framework
8 Hardware spinlock modules provide hardware assistance for synchronization
12 For example, OMAP4 has dual Cortex-A9, dual Cortex-M3 and a C64x+ DSP,
17 A generic hwspinlock framework allows platform-independent drivers to use
22 This is necessary, for example, for Inter-processor communications:
23 on OMAP4, cpu-intensive multimedia tasks are offloaded by the host to the
26 To achieve fast message-based communications, a minimal kernel support
35 A common hwspinlock interface makes it possible to have generic, platform-
50 Should be called from a process context (might sleep).
61 Should be called from a process context (might sleep).
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| /linux/arch/arm/mach-omap2/ |
| H A D | clockdomain.c | 1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2008-2011 Texas Instruments, Inc.
6 * Copyright (C) 2008-2011 Nokia Corporation
22 #include <linux/clk-provider.h>
56 if (!strcmp(name, temp_clkdm->name)) { in _clkdm_lookup()
66 * _clkdm_register - register a clockdomain
70 * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
77 if (!clkdm || !clkdm->name) in _clkdm_register()
78 return -EINVAL; in _clkdm_register()
80 pwrdm = pwrdm_lookup(clkdm->pwrdm.name); in _clkdm_register()
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| H A D | powerdomain.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
5 * Copyright (C) 2007-2008, 2010 Texas Instruments, Inc.
6 * Copyright (C) 2007-2011 Nokia Corporation
10 * XXX This should be moved to the mach-omap2/ directory at the earliest
29 /* Powerdomain allowable state bitfields */
45 * PWRDM_HAS_HDWR_SAR - powerdomain has hardware save-and-restore support
47 * PWRDM_HAS_MPU_QUIRK - MPU pwr domain has MEM bank 0 bits in MEM
50 * PWRDM_HAS_LOWPOWERSTATECHANGE - can transition from a sleep state
51 * to a lower sleep state without waking up the powerdomain
58 * Number of memory banks that are power-controllable. On OMAP4430, the
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| H A D | clockdomain.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
6 * Copyright (C) 2008-2011 Nokia Corporation
33 * hardware-supervised idle mode, the PRCM may transition the
34 * enclosing powerdomain to a low power state, even when devices
38 * force-sleep mode, then the HW_AUTO mode will be used to put the
39 * clockdomain to sleep. Similarly, if the clockdomain supports
40 * the force-wakeup mode, then it will be used whenever a clock or
57 * struct clkdm_autodep - clkdm deps to add when entering/exiting hwsup mode
58 * @clkdm: clockdomain to add wkdep+sleepdep on - set name member only
66 * omap_hwmod-based fine-grained module idle control is added.
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| /linux/include/linux/ |
| H A D | hwspinlock.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Hardware spinlock public header
5 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
7 * Contact: Ohad Ben-Cohen <ohad@wizery.com>
17 #define HWLOCK_IRQSTATE 0x01 /* Disable interrupts, save state */
18 #define HWLOCK_IRQ 0x02 /* Disable interrupts, don't save state */
29 * struct hwspinlock_pdata - platform data for hwspinlock drivers
32 * hwspinlock devices provide system-wide hardware locks that are used
35 * To achieve that, each physical lock must have a system-wide id number
37 * they're using the same hardware lock.
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| H A D | leds.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
11 #include <dt-bindings/leds/common.h>
47 * struct led_lookup_data - represents a single LED lookup entry
66 * with in-driver hard-coded LED names used as a fallback when
79 * only LEDs exposed by drivers of hot-pluggable devices should
122 /* Brightness off also disables hw-blinking so it is a separate action */
128 * Must not sleep. Use brightness_set_blocking for drivers
129 * that can sleep while setting brightness.
134 * Set LED brightness level immediately - it can block the caller for
143 * Activate hardware accelerated blink, delays are in milliseconds
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| H A D | serial_core.h | 1 /* SPDX-License-Identifier: GPL-2.0-or-later */
25 ((port)->cons && (port)->cons->index == (port)->line)
37 * struct uart_ops -- interface between serial_core and the driver
40 * physical hardware.
51 * This call must not sleep
55 * This function sets the modem control lines for @port to the state
58 * - %TIOCM_RTS RTS signal.
59 * - %TIOCM_DTR DTR signal.
60 * - %TIOCM_OUT1 OUT1 signal.
61 * - %TIOCM_OUT2 OUT2 signal.
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| /linux/Documentation/ABI/testing/ |
| H A D | sysfs-power | 9 What: /sys/power/state
13 The /sys/power/state file controls system sleep states.
14 Reading from this file returns the available sleep state
15 labels, which may be "mem" (suspend), "standby" (power-on
16 suspend), "freeze" (suspend-to-idle) and "disk" (hibernation).
19 to transition into the corresponding state, if available.
21 See Documentation/admin-guide/pm/sleep-states.rst for more
32 to suspend the system (by writing "mem" to the /sys/power/state
39 See Documentation/admin-guide/pm/sleep-states.rst for more
47 suspend-to-disk mechanism. Reading from this file returns
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| H A D | sysfs-devices-power | 15 from sleep states, such as the memory sleep state (suspend to
19 Some devices support "wakeup" events, which are hardware signals
20 used to activate the system from a sleep state. Such devices
33 be enabled to wake up the system from sleep states.
40 space to control the run-time power management of the device.
61 with the main suspend/resume thread) during system-wide power
86 attribute is read-only. If the device is not capable to wake up
87 the system from sleep states, this attribute is not present.
88 If the device is not enabled to wake up the system from sleep
98 is read-only. If the device is not capable to wake up the
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| /linux/Documentation/devicetree/bindings/mfd/ |
| H A D | max77620.txt | 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.
21 - system-power-controller: Indicates that this PMIC is controlling the
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| /linux/drivers/acpi/acpica/ |
| H A D | hwsleep.c | 1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the
5 * original/legacy sleep/PM registers.
7 * Copyright (C) 2000 - 2023, Intel Corp.
22 * PARAMETERS: sleep_state - Which sleep state to enter
26 * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
79 "Entering sleep state [S%u]\n", sleep_state)); in acpi_hw_legacy_sleep()
83 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | in acpi_hw_legacy_sleep()
84 sleep_enable_reg_info->access_bit_mask); in acpi_hw_legacy_sleep()
90 (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position); in acpi_hw_legacy_sleep()
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| H A D | hwxface.c | 1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: hwxface - Public ACPICA hardware interfaces
6 * Copyright (C) 2000 - 2023, Intel Corp.
44 !reset_reg->address) { in acpi_reset()
48 if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { in acpi_reset()
60 status = acpi_os_write_port((acpi_io_address)reset_reg->address, in acpi_reset()
78 * PARAMETERS: value - Where the value is returned in ACPI_EXPORT_SYMBOL()
79 * reg - GAS register structure in ACPI_EXPORT_SYMBOL()
108 * PARAMETERS: value - Value to be written in ACPI_EXPORT_SYMBOL()
109 * reg - GAS register structure in ACPI_EXPORT_SYMBOL()
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| H A D | hwesleep.c | 1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Name: hwesleep.c - ACPI Hardware Sleep/Wake Support functions for the
5 * extended FADT-V5 sleep registers.
7 * Copyright (C) 2000 - 2023, Intel Corp.
21 * PARAMETERS: method_pathname - Pathname of method to execute
22 * integer_argument - Argument to pass to the method
26 * DESCRIPTION: Execute a sleep/wake related method with one integer argument
58 * PARAMETERS: sleep_state - Which sleep state to enter
62 * DESCRIPTION: Enter a system sleep state via the extended FADT sleep
76 /* Extended sleep registers must be valid */ in acpi_hw_extended_sleep()
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| /linux/drivers/hwspinlock/ |
| H A D | hwspinlock_core.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * Hardware spinlock framework
5 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
7 * Contact: Ohad Ben-Cohen <ohad@wizery.com>
19 #include <linux/radix-tree.h>
36 * and provides easy-to-use API which makes the hwspinlock core code simple
54 * as the radix-tree API requires that users provide all synchronisation.
55 * A mutex is needed because we're using non-atomic radix tree allocations.
61 * __hwspin_trylock() - attempt to lock a specific hwspinlock
64 * @flags: a pointer where the caller's interrupt state will be saved at (if
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| /linux/drivers/iio/pressure/ |
| H A D | zpa2326.c | 1 // SPDX-License-Identifier: GPL-2.0-only
15 * A internal hardware trigger is also implemented to dispatch registered IIO
18 * ZPA2326 hardware supports 2 sampling mode: one shot and continuous.
29 * The continuous mode works according to a periodic hardware measurement
30 * process continuously pushing samples into an internal hardware FIFO (for
34 * - get device out of low power mode,
35 * - setup hardware sampling period,
36 * - at end of period, upon data ready interrupt: pop pressure samples out of
37 * hardware FIFO and fetch temperature sample
38 * - when no longer needed, stop sampling process by putting device into
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| /linux/Documentation/power/ |
| H A D | swsusp.rst | 23 your hardware while system is suspended... well, it was not good idea;
45 echo shutdown > /sys/power/disk; echo disk > /sys/power/state
47 - If you feel ACPI works pretty well on your system, you might try::
49 echo platform > /sys/power/disk; echo disk > /sys/power/state
51 - If you would like to write hibernation image to swap and then suspend
54 echo suspend > /sys/power/disk; echo disk > /sys/power/state
56 - If you have SATA disks, you'll need recent kernels with SATA suspend
58 are built into kernel -- not modules. [There's way to make
68 - The resume process checks for the presence of the resume device,
72 - The resume process may be triggered in two ways:
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