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/Documentation/block/
Dbfq-iosched.rst5 BFQ is a proportional-share I/O scheduler, with some extra
6 low-latency capabilities. In addition to cgroups support (blkio or io
9 - BFQ guarantees a high system and application responsiveness, and a
10 low latency for time-sensitive applications, such as audio or video
12 - BFQ distributes bandwidth, not just time, among processes or
19 goal, for a given device, is to achieve the maximum-possible
20 throughput at all times, then do switch off all low-latency heuristics
25 As every I/O scheduler, BFQ adds some overhead to per-I/O-request
27 single-lock-protected, per-request processing time of BFQ---i.e., the
29 completion hooks---is, e.g., 1.9 us on an Intel Core i7-2760QM@2.40GHz
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/Documentation/admin-guide/perf/
Ddwc_pcie_pmu.rst9 Port in a Vendor-Specific Extended Capability named RAS D.E.S (Debug, Error
17 - one 64-bit counter for Time Based Analysis (RX/TX data throughput and
18 time spent in each low-power LTSSM state) and
19 - one 32-bit counter for Event Counting (error and non-error events for
25 -------------------
28 throughput and time spent in each low-power LTSSM state by the controller.
31 - Group#0: Percentage of time the controller stays in LTSSM states.
32 - Group#1: Amount of data processed (Units of 16 bytes).
35 -------------------
37 Using this feature you can obtain Error and Non-Error information in
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/Documentation/userspace-api/media/v4l/
Dext-ctrls-rf-tuner.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _rf-tuner-controls:
16 called Zero-IF tuners. Older tuners were typically simple PLL tuners
28 .. _rf-tuner-control-id:
39 Enables/disables tuner radio channel bandwidth configuration. In
40 automatic mode bandwidth configuration is performed by the driver.
45 desired bandwidth requirement. Used when
47 range and step are driver-specific.
64 range and step are driver-specific.
67 LNA (low noise amplifier) gain is first gain stage on the RF tuner
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/Documentation/usb/
Dehci.rst5 27-Dec-2002
8 USB 2.0-capable host controller hardware. The USB 2.0 standard is
11 - "High Speed" 480 Mbit/sec (60 MByte/sec)
12 - "Full Speed" 12 Mbit/sec (1.5 MByte/sec)
13 - "Low Speed" 1.5 Mbit/sec
15 USB 1.1 only addressed full speed and low speed. High speed devices
23 (TT) in the hub, which turns low or full speed transactions into
24 high speed "split transactions" that don't waste transfer bandwidth.
31 While usb-storage devices have been available since mid-2001 (working
34 appear to be on hold until more systems come with USB 2.0 built-in.
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/Documentation/admin-guide/media/
Dsi476x.rst1 .. SPDX-License-Identifier: GPL-2.0
12 -------------------
14 - According to the SiLabs' datasheet it is possible to update the
15 firmware of the radio chip in the run-time, thus bringing it to the
23 -------------------------------
31 * /sys/kernel/debug/<device-name>/acf
48 bandwidth is less than threshold
52 0x05 smute 0 - Audio is not soft muted
53 1 - Audio is soft muted
55 0x07 chbw Channel filter bandwidth in kHz
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Dphilips.rst1 .. SPDX-License-Identifier: GPL-2.0
7 E-mail: webcam@smcc.demon.nl Last updated: 2004-01-19
30 * Samsung MPC-C10
31 * Samsung MPC-C30
33 * AME CU-001
34 * Visionite VCS-UM100
35 * Visionite VCS-UC300
40 framerates; in addition the webcam uses less bandwidth on the USB bus (handy
46 the latter, since it makes troubleshooting a lot easier. The built-in
50 camera; some programs depend on a particular image-size or -format and
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/Documentation/devicetree/bindings/pwm/
Dmicrochip,corepwm.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Conor Dooley <conor.dooley@microchip.com>
16 https://www.microsemi.com/existing-parts/parts/152118
19 - $ref: pwm.yaml#
24 - const: microchip,corepwm-rtl-v4
32 "#pwm-cells":
37 microchip,sync-update-mask:
48 Each bit of "microchip,sync-update-mask" corresponds to a PWM channel & represents
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/Documentation/devicetree/bindings/net/wireless/
Dmediatek,mt76.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 # Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Felix Fietkau <nbd@nbd.name>
12 - Lorenzo Bianconi <lorenzo@kernel.org>
13 - Ryder Lee <ryder.lee@mediatek.com>
25 - mediatek,mt76
26 - mediatek,mt7628-wmac
27 - mediatek,mt7622-wmac
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/Documentation/arch/x86/
Dresctrl.rst1 .. SPDX-License-Identifier: GPL-2.0
9 :Authors: - Fenghua Yu <fenghua.yu@intel.com>
10 - Tony Luck <tony.luck@intel.com>
11 - Vikas Shivappa <vikas.shivappa@intel.com>
25 MBM (Memory Bandwidth Monitoring) "cqm_mbm_total", "cqm_mbm_local"
26 MBA (Memory Bandwidth Allocation) "mba"
27 SMBA (Slow Memory Bandwidth Allocation) ""
28 BMEC (Bandwidth Monitoring Event Configuration) ""
38 # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps][,debug]] /sys/fs/resctrl
48 bandwidth in MiBps
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/Documentation/devicetree/bindings/iio/adc/
Dadi,ad4000.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Marcelo Schmitt <marcelo.schmitt@analog.com>
15 https://www.analog.com/media/en/technical-documentation/data-sheets/ad4000-4004-4008.pdf
16 https://www.analog.com/media/en/technical-documentation/data-sheets/ad4001-4005.pdf
17 https://www.analog.com/media/en/technical-documentation/data-sheets/ad4002-4006-4010.pdf
18 https://www.analog.com/media/en/technical-documentation/data-sheets/ad4003-4007-4011.pdf
19 https://www.analog.com/media/en/technical-documentation/data-sheets/ad4020-4021-4022.pdf
20 https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4001.pdf
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/Documentation/iio/
Dadxl380.rst1 .. SPDX-License-Identifier: GPL-2.0
15 The ADXL380/ADXL382 is a low noise density, low power, 3-axis accelerometer with
37 +---------------------------------------------------+----------------------------------------------…
38 | 3-Axis Accelerometer related device files | Description …
39 +---------------------------------------------------+----------------------------------------------…
41 +---------------------------------------------------+----------------------------------------------…
42 | in_accel_filter_high_pass_3db_frequency | Low pass filter bandwidth. …
43 +---------------------------------------------------+----------------------------------------------…
44 | in_accel_filter_high_pass_3db_frequency_available | Available low pass filter bandwidth configura…
45 +---------------------------------------------------+----------------------------------------------…
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/Documentation/networking/
Ddevmem.rst1 .. SPDX-License-Identifier: GPL-2.0
16 -----------
22 - Distributed training, where ML accelerators, such as GPUs on different hosts,
25 - Distributed raw block storage applications transfer large amounts of data with
28 Typically the Device-to-Device data transfers in the network are implemented as
29 the following low-level operations: Device-to-Host copy, Host-to-Host network
30 transfer, and Host-to-Device copy.
34 bandwidth and PCIe bandwidth.
46 - Alleviate host memory bandwidth pressure, compared to existing
47 network-transfer + device-copy semantics.
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Dieee802154.rst11 - ZigBee - proprietary protocol from the ZigBee Alliance
12 - 6LoWPAN - IPv6 networking over low rate personal area networks
14 The goal of the Linux-wpan is to provide a complete implementation
16 of protocols for organizing Low-Rate Wireless Personal Area Networks.
20 - IEEE 802.15.4 layer; We have chosen to use plain Berkeley socket API,
23 - MAC - provides access to shared channel and reliable data delivery
24 - PHY - represents device drivers
35 in the userspace package (see either https://linux-wpan.org/wpan-tools.html
36 or the git tree at https://github.com/linux-wpan/wpan-tools).
45 taking into account limited bandwidth, memory, or energy resources that are
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/Documentation/driver-api/
Dslimbus.rst9 ----------------
10 SLIMbus (Serial Low Power Interchip Media Bus) is a specification developed by
12 configuration, and is a 2-wire multi-drop implementation (clock, and data).
15 (System-on-Chip) and peripheral components (typically codec). SLIMbus uses
16 Time-Division-Multiplexing to accommodate multiple data channels, and
24 A data channel is used for data-transfer between 2 SLIMbus devices. Data
28 ---------------------
36 Framer device is responsible for clocking the bus, and transmitting frame-sync
49 responsible to select the active-framer for clocking the bus.
52 current frequency and bandwidth requirements. There are 10 clock gears and each
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Dxillybus.rst10 - Introduction
11 -- Background
12 -- Xillybus Overview
14 - Usage
15 -- User interface
16 -- Synchronization
17 -- Seekable pipes
19 - Internals
20 -- Source code organization
21 -- Pipe attributes
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Dptp.rst1 .. SPDX-License-Identifier: GPL-2.0
18 - Set time
19 - Get time
20 - Shift the clock by a given offset atomically
21 - Adjust clock frequency
24 - Time stamp external events
25 - Period output signals configurable from user space
26 - Low Pass Filter (LPF) access from user space
27 - Synchronization of the Linux system time via the PPS subsystem
65 ancillary feature, then the driver should just return -EOPNOTSUPP
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/Documentation/devicetree/bindings/clock/
Dbaikal,bt1-ccu-pll.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/clock/baikal,bt1-ccu-pll.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Baikal-T1 Clock Control Unit PLL
11 - Serge Semin <fancer.lancer@gmail.com>
14 Clocks Control Unit is the core of Baikal-T1 SoC System Controller
18 IP-blocks or to groups of blocks (clock domains). The transformation is done
19 by means of PLLs and gateable/non-gateable dividers embedded into the CCU.
23 2) PLLs clocks generators (PLLs) - described in this binding file.
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/Documentation/driver-api/usb/
Dusb.rst1 .. _usb-hostside-api:
4 The Linux-USB Host Side API
18 That master/slave asymmetry was designed-in for a number of reasons, one
22 distributed auto-configuration since the pre-designated master node
37 USB Host-Side API Model
40 Host-side drivers for USB devices talk to the "usbcore" APIs. There are
41 two. One is intended for *general-purpose* drivers (exposed through
49 - USB supports four kinds of data transfers (control, bulk, interrupt,
50 and isochronous). Two of them (control and bulk) use bandwidth as
52 scheduled to provide guaranteed bandwidth.
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/Documentation/userspace-api/media/dvb/
Ddvb-frontend-parameters.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 per-system parameters. However, as newer delivery systems required more
24 DVB-S2, DVB-T2, DVB-C2, ISDB, etc.
30 .. code-block:: c
61 .. code-block:: c
77 .. code-block:: c
94 .. code-block:: c
106 DVB-T frontends are supported by the ``dvb_ofdm_parameters`` structure:
109 .. code-block:: c
112 fe_bandwidth_t bandwidth;
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Dfe_property_parameters.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
15 .. _DTV-UNDEFINED:
24 .. _DTV-TUNE:
33 .. _DTV-CLEAR:
42 .. _DTV-FREQUENCY:
57 of the transponder/channel. The exception is for ISDB-T, where
60 #. For ISDB-T, the channels are usually transmitted with an offset of
62 stepping is bound to the bandwidth of the channel which is
65 #. In ISDB-Tsb, the channel consists of only one or three segments the
69 .. _DTV-MODULATION:
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/Documentation/driver-api/dmaengine/
Dpxa_dma.rst2 PXA/MMP - DMA Slave controller
22 at the time of irq/dma tx2 is already finished, tx1->complete() and
23 tx2->complete() should be called.
32 d) Bandwidth guarantee
33 The PXA architecture has 4 levels of DMAs priorities : high, normal, low.
34 The high priorities get twice as much bandwidth as the normal, which get twice
35 as much as the low priorities.
36 A driver should be able to request a priority, especially the real-time
46 b) Transfer anatomy for a scatter-gather transfer
50 +------------+-----+---------------+----------------+-----------------+
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/Documentation/devicetree/bindings/mfd/
Daspeed-lpc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/mfd/aspeed-lpc.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Aspeed Low Pin Count (LPC) Bus Controller
11 - Andrew Jeffery <andrew@aj.id.au>
12 - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
15 The LPC bus is a means to bridge a host CPU to a number of low-bandwidth
21 The LPC controller is represented as a multi-function device to account for the
27 as LPC firmware hub cycles, configuration of the LPC-to-AHB mapping, UART
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/Documentation/i2c/
Dsummary.rst6 a protocol developed by Philips. It is a two-wire protocol with variable
9 low bandwidth communications needs. I2C is widely used with embedded
14 The latest official I2C specification is the `"I²C-bus specification and user
15 manual" (UM10204) <https://www.nxp.com/docs/en/user-guide/UM10204.pdf>`_
36 .. kernel-figure:: i2c_bus.svg
59 video-related chips.
66 --------
75 --------------------
82 target. Work to replace the old terminology in the Linux Kernel is on-going.
/Documentation/devicetree/bindings/mips/brcm/
Dsoc.txt5 - compatible: "brcm,bcm3368", "brcm,bcm3384", "brcm,bcm33843"
6 "brcm,bcm3384-viper", "brcm,bcm33843-viper"
12 The experimental -viper variants are for running Linux on the 3384's
16 ----------------
21 = Always-On control block (AON CTRL)
23 This hardware provides control registers for the "always-on" (even in low-power
27 - compatible : should be one of
28 "brcm,bcm7425-aon-ctrl"
29 "brcm,bcm7429-aon-ctrl"
30 "brcm,bcm7435-aon-ctrl" and
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/Documentation/userspace-api/accelerators/
Docxl.rst6 at being low-latency and high-bandwidth. The specification is
14 OpenCAPI is known in linux as 'ocxl', as the open, processor-agnostic
20 High-level view
29 +-----------+ +-------------+
33 | | +--------+ | Unit | +--------+
34 | |--| Memory | | (AFU) |--| Memory |
35 | | +--------+ | | +--------+
36 +-----------+ +-------------+
38 +-----------+ +-------------+
40 +-----------+ +-------------+
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