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/Documentation/hwmon/
Dg762.rst5 and performs closed-loop or open-loop control of the fan speed. Two
6 modes - PWM or DC - are supported by the device.
9 http://natisbad.org/NAS/ref/GMT_EDS-762_763-080710-0.2.pdf. sysfs
10 bindings are described in Documentation/hwmon/sysfs-interface.rst.
13 /sys/bus/i2c/drivers/g762/ to control the operation of the device.
25 set desired fan speed. This only makes sense in closed-loop
26 fan speed control (i.e. when pwm1_enable is set to 2).
44 in closed-loop control mode, if fan RPM value is 25% out
49 set current fan speed control mode i.e. 1 for manual fan
50 speed control (open-loop) via pwm1 described below, 2 for
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Dadt7470.rst17 -----------
22 The ADT7470 uses the 2-wire interface compatible with the SMBus 2.0
24 external temperatures. It has four (4) 16-bit counters for measuring fan speed.
25 There are four (4) PWM outputs that can be used to control fan speed.
27 A sophisticated control system for the PWM outputs is designed into the ADT7470
32 feature can also be disabled for manual control of the PWM's.
40 automatic fan pwm control to set the fan speed. The driver will not read the
45 ----------------
47 The ADT7470 has a 8-bit ADC and is capable of measuring temperatures with 1
51 determining an optimal configuration for the automatic PWM control.
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/Documentation/scheduler/
Dsched-rt-group.rst2 Real-Time group scheduling
12 2.1 System-wide settings
33 are real-time processes).
40 ---------------
42 Real-time scheduling is all about determinism, a group has to be able to rely on
44 multiple groups of real-time tasks, each group must be assigned a fixed portion
45 of the CPU time available. Without a minimum guarantee a real-time group can
50 ----------------
53 in a given period. We allocate this "run time" for each real-time group which
54 the other real-time groups will not be permitted to use.
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Dsched-bwc.rst2 CFS Bandwidth Control
6 This document only discusses CPU bandwidth control for SCHED_NORMAL.
7 The SCHED_RT case is covered in Documentation/scheduler/sched-rt-group.rst
9 CFS bandwidth control is a CONFIG_FAIR_GROUP_SCHED extension which allows the
14 microseconds of CPU time. That quota is assigned to per-cpu run queues in
17 throttled. Throttled threads will not be able to run again until the next
22 is transferred to cpu-local "silos" on a demand basis. The amount transferred
26 -------------
30 Traditional (UP-EDF) bandwidth control is something like:
36 we'd have to run more than a second of program time, and obviously miss
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/Documentation/leds/
Dleds-lp5521.rst10 Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
13 -----------
16 the led class control interface. Channels have generic names:
23 There are two ways to run LED patterns.
25 1) Legacy interface - enginex_mode and enginex_load
26 Control interface for the engines:
31 disabled, load, run
40 echo "run" > engine3_mode
46 2) Firmware interface - LP55xx common interface
48 For the details, please refer to 'firmware' section in leds-lp55xx.txt
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Dleds-lp5523.rst9 Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
12 -----------
14 the led class control interface.
15 The name of each channel is configurable in the platform data - name and label.
22 - /sys/class/leds/R1 (name: 'R1')
23 - /sys/class/leds/B1 (name: 'B1')
28 - /sys/class/leds/RGB:channelN (label: 'RGB', N: 0 ~ 8)
33 - /sys/class/leds/lp5523:channelN (N: 0 ~ 8)
36 There are two ways to run LED patterns.
38 1) Legacy interface - enginex_mode, enginex_load and enginex_leds
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Dleds-lp55xx.rst8 -----------
14 Device attributes for user-space interface
28 control multi output LED channels such as led current, channel index.
30 general chip control such like the I2C and platform data.
50 - Maximum number of channels
51 - Reset command, chip enable command
52 - Chip specific initialization
53 - Brightness control register access
54 - Setting LED output current
55 - Program memory address access for running patterns
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Dledtrig-transient.rst36 that are active at the time driver gets suspended, continue to run, without
56 non-transient state. When driver gets suspended, irrespective of the transient
66 Add a new property trigger state to control the state.
71 - duration allows setting timer value in msecs. The initial value is 0.
72 - activate allows activating and deactivating the timer specified by
75 - state allows user to specify a transient state to be held for the specified
79 - one shot timer activate mechanism.
90 - one shot timer value. When activate is set, duration value
96 - transient state to be held. It has two values 0 or 1. 0 maps
99 state gets changed to the non-transient state which is the
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/Documentation/devicetree/bindings/pinctrl/
Dsprd,pinctrl.txt5 The first block comprises some global control registers, and each
8 pad driving level, system control select and so on ("domain pad
11 select 3.0v, then the pin can output 3.0v. "system control" is used
16 of them, so we can not make every Spreadtrum-special configuration
18 global configuration in future. Then we add one "sprd,control" to
19 set these various global control configuration, and we need use
23 bits in one global control register as one pin, thus we should
35 - input-enable
36 - input-disable
37 - output-high
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/Documentation/dev-tools/kunit/
Dfaq.rst1 .. SPDX-License-Identifier: GPL-2.0
17 the test's control like hardware.
21 testing frameworks require tests to be written in userspace and run on the
35 (see :ref:`kunit-on-qemu`).
37 In short, yes, you can run KUnit on other architectures, but it might require
40 For more information, see :ref:`kunit-on-non-uml`.
42 .. _kinds-of-tests:
47 test, or an end-to-end test.
49 - A unit test is supposed to test a single unit of code in isolation. A unit
53 outside of the test's control like hardware.
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/Documentation/arch/powerpc/
Ddexcr.rst1 .. SPDX-License-Identifier: GPL-2.0-or-later
4 DEXCR (Dynamic Execution Control Register)
11 PowerPC ISA 3.1B (Power10) that allows per-cpu control over several dynamic
13 branch target prediction) and enabling return-oriented programming (ROP)
16 The execution control is exposed in hardware as up to 32 bits ('aspects') in
22 A privileged SPR that can control aspects for userspace and kernel space
24 A hypervisor-privileged SPR that can control aspects for the hypervisor and
27 An optional ultravisor-privileged SPR that can control aspects for the ultravisor.
30 provides a non-privileged read-only view of the userspace DEXCR aspects.
31 There is also an SPR that provides a read-only view of the hypervisor enforced
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/Documentation/devicetree/bindings/soc/fsl/
Dfsl,rcpm.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Run Control and Power Management
10 The RCPM performs all device-level tasks associated with device run control
14 - Frank Li <Frank.Li@nxp.com>
19 - items:
20 - enum:
21 - fsl,p2041-rcpm
22 - fsl,p3041-rcpm
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/Documentation/devicetree/bindings/leds/
Dleds-lm3532.txt1 * Texas Instruments - lm3532 White LED driver with ambient light sensing
4 The LM3532 provides the 3 high-voltage, low-side current sinks. The device is
5 programmable over an I2C-compatible interface and has independent
6 current control for all three channels. The adaptive current regulation
11 each with 32 internal voltage setting resistors, 8-bit logarithmic and linear
12 brightness control, dual external PWM brightness control inputs, and up to
16 - compatible : "ti,lm3532"
17 - reg : I2C slave address
18 - #address-cells : 1
19 - #size-cells : 0
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/Documentation/devicetree/bindings/regulator/
Drohm,bd71815-regulator.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/regulator/rohm,bd71815-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Matti Vaittinen <mazziesaccount@gmail.com>
14 see Documentation/devicetree/bindings/mfd/rohm,bd71815-pmic.yaml.
16 The regulator controller is represented as a sub-node of the PMIC node
33 regulator-name:
37 "^((ldo|buck)[1-5]|ldolpsr|ldodvref)$":
44 regulator-name:
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Drohm,bd71847-regulator.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/regulator/rohm,bd71847-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Matti Vaittinen <mazziesaccount@gmail.com>
15 Documentation/devicetree/bindings/mfd/rohm,bd71847-pmic.yaml
20 Note that if BD71847 starts at RUN state you probably want to use
21 regulator-boot-on at least for BUCK5. LDO6 is supplied by it and it must
30 "^LDO[1-6]$":
37 regulator-name:
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Drohm,bd71837-regulator.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/regulator/rohm,bd71837-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Matti Vaittinen <mazziesaccount@gmail.com>
15 Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.yaml
20 Note that if BD71837 starts at RUN state you probably want to use
21 regulator-boot-on at least for BUCK6 and BUCK7 so that those are not
31 "^LDO[1-7]$":
38 regulator-name:
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/Documentation/ABI/testing/
Dsysfs-kernel-mm-ksm4 Contact: Linux memory management mailing list <linux-mm@kvack.org>
13 What: /sys/kernel/mm/ksm/run
16 Contact: Linux memory management mailing list <linux-mm@kvack.org>
36 run: write 0 to disable ksm, read 0 while ksm is disabled.
38 - write 1 to run ksm, read 1 while ksm is running.
39 - write 2 to disable ksm and unmerge all its pages.
49 Contact: Linux memory management mailing list <linux-mm@kvack.org>
50 Description: Control merging pages across different NUMA nodes.
58 Contact: Linux memory management mailing list <linux-mm@kvack.org>
61 calculation is in Documentation/admin-guide/mm/ksm.rst.
Dsysfs-platform-dell-laptop7 This file allows to control the automatic keyboard
27 This file allows to control the input triggers that
31 enabled are preceded by '+', those disabled by '-'.
35 by '-' instead.
37 For example, to enable the keyboard as trigger run::
43 echo -keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
63 For example, to set the timeout to 10 minutes run::
Dsysfs-devices-power35 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:
45 + "auto\n" to allow the device to be power managed at run time;
51 from power managing the device at run time. Doing that while
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
98 is read-only. If the device is not capable to wake up the
110 state in progress. This attribute is read-only. If the device
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/Documentation/devicetree/bindings/dvfs/
Dperformance-domain.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/dvfs/performance-domain.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sudeep Holla <sudeep.holla@arm.com>
14 CPUs that run in the same performance domain. Performance domains must not
16 of devices that always have to run at the same performance level. For a given
17 performance domain, there is a single point of control that affects all the
21 have a common frequency control, is said to be in the same performance
30 \#performance-domain-cells property in the performance domain provider node.
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/Documentation/admin-guide/hw-vuln/
Dl1tf.rst1 L1TF - L1 Terminal Fault
10 -------------------
15 - Processors from AMD, Centaur and other non Intel vendors
17 - Older processor models, where the CPU family is < 6
19 - A range of Intel ATOM processors (Cedarview, Cloverview, Lincroft,
22 - The Intel XEON PHI family
24 - Intel processors which have the ARCH_CAP_RDCL_NO bit set in the
33 ------------
38 CVE-2018-3615 L1 Terminal Fault SGX related aspects
39 CVE-2018-3620 L1 Terminal Fault OS, SMM related aspects
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Dvmscape.rst1 .. SPDX-License-Identifier: GPL-2.0
10 guest-userspace may be able to attack the guest-kernel using the hypervisor as
14 -------------------
19 - Skylake generation (Parts without Enhanced-IBRS)
20 - Cascade Lake generation - (Parts affected by ITS guest/host separation)
21 - Alder Lake and newer (Parts affected by BHI)
27 - Zen series (families 0x17, 0x19, 0x1a)
30 - Family 0x18
33 ----------
36 ----------------
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/Documentation/arch/x86/
Dsgx.rst1 .. SPDX-License-Identifier: GPL-2.0
13 * Privileged (ring-0) ENCLS functions orchestrate the construction of the
15 * Unprivileged (ring-3) ENCLU functions allow an application to enter and
38 with an enclave. It is contained in a BIOS-reserved region of physical memory.
49 ------------------
51 **SGX Enclave Control Structure (SECS)**
58 **Thread Control Structure (TCS)**
59 Thread Control Structure pages define the entry points to an enclave and
67 ----------------------
76 remain read-only. EPCM permissions may only impose additional restrictions on
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/Documentation/networking/devlink/
Dmlx5.rst1 .. SPDX-License-Identifier: GPL-2.0
13 .. list-table:: Generic parameters implemented
15 * - Name
16 - Mode
17 - Validation
18 * - ``enable_roce``
19 - driverinit
20 - Type: Boolean
23 device support for RoCE capability. Otherwise, the control occurs in the
26 * - ``io_eq_size``
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/Documentation/driver-api/dmaengine/
Ddmatest.rst21 capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
22 (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
28 Part 1 - How to build the test module
33 Device Drivers -> DMA Engine support -> DMA Test client
38 Part 2 - When dmatest is built as a module
43 % modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1
51 % echo 1 > /sys/module/dmatest/parameters/run
55 dmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1
57 Example of multi-channel test usage (new in the 5.0 kernel)::
65 % echo 1 > /sys/module/dmatest/parameters/run
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