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/Documentation/devicetree/bindings/iio/adc/
Dadi,ad7606.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Analog Devices AD7606 Simultaneous Sampling ADC
10 - Beniamin Bia <beniamin.bia@analog.com>
11 - Stefan Popa <stefan.popa@analog.com>
14 Analog Devices AD7606 Simultaneous Sampling ADC
15 https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606_7606-6_7606-4.pdf
16 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7606B.pdf
17 https://www.analog.com/media/en/technical-documentation/data-sheets/AD7616.pdf
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/Documentation/media/v4l-drivers/
Dcx88.rst1 .. SPDX-License-Identifier: GPL-2.0
12 --------------
15 - Works.
16 - Overlay isn't supported.
19 - Works. The TV standard detection is made by the driver, as the
20 hardware has bugs to auto-detect.
21 - audio data dma (i.e. recording without loopback cable to the
22 sound card) is supported via cx88-alsa.
25 - Works.
29 --------------------------------
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/Documentation/admin-guide/
Dcpu-load.rst10 Linux 2.6.18.3-exp (linmac) 02/20/2007
12 avg-cpu: %user %nice %system %iowait %steal %idle
17 Here the system thinks that over the default sampling period the
34 -------
40 |--------------------------------------|
55 /* gcc -o hog smallhog.c */
72 while (!stop && --niters);
88 for (i = 0; i < HIST; ++i) v[i] = ULONG_MAX - hog (ULONG_MAX);
91 n = tmp - (tmp / 3.0);
105 ----------
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Dperf-security.rst7 --------
12 direct usage of perf_events system call API [2]_ and over data files
50 -------------------------------
66 independently enabled and disabled on per-thread basis for processes and
86 ---------------------------------
88 Mechanisms of capabilities, privileged capability-dumb files [6]_ and
101 # ls -alhF
102 -rwxr-xr-x 2 root root 11M Oct 19 15:12 perf
104 # ls -alhF
105 -rwxr-xr-x 2 root perf_users 11M Oct 19 15:12 perf
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Dcgroup-v2.rst9 conventions of cgroup v2. It describes all userland-visible aspects
12 v1 is available under Documentation/admin-guide/cgroup-v1/.
17 1-1. Terminology
18 1-2. What is cgroup?
20 2-1. Mounting
21 2-2. Organizing Processes and Threads
22 2-2-1. Processes
23 2-2-2. Threads
24 2-3. [Un]populated Notification
25 2-4. Controlling Controllers
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Dkernel-parameters.txt5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
56 Documentation/firmware-guide/acpi/debug.rst for more information about
119 Disable auto-serialization of AML methods
122 auto-serialization feature.
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/Documentation/media/uapi/v4l/
Dvidioc-cropcap.rst4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
5 .. and no Back-Cover Texts. A copy of the license is included at
6 .. Documentation/media/uapi/fdl-appendix.rst.
8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
19 VIDIOC_CROPCAP - Information about the video cropping and scaling abilities
33 File descriptor returned by :ref:`open() <func-open>`.
51 support cropping and/or scaling and/or have non-square pixels, and for
58 .. flat-table:: struct v4l2_cropcap
59 :header-rows: 0
60 :stub-columns: 0
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Dhist-v4l2.rst4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
5 .. and no Back-Cover Texts. A copy of the license is included at
6 .. Documentation/media/uapi/fdl-appendix.rst.
8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
10 .. _hist-v4l2:
28 1998-08-20: First version.
30 1998-08-27: The :ref:`select() <func-select>` function was introduced.
32 1998-09-10: New video standard interface.
34 1998-09-18: The ``VIDIOC_NONCAP`` ioctl was replaced by the otherwise
35 meaningless ``O_TRUNC`` :ref:`open() <func-open>` flag, and the
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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
16 explore debugging method which rely on self-hosted debug mode, this document
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
32 registers to decide if sample-based profiling is implemented or not. On some
36 - At the time this documentation was written, the debug driver mainly relies on
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/Documentation/usb/
Dgadget-testing.rst37 Function-specific configfs interface
38 ------------------------------------
45 The attribute is read-only.
51 ------------------------
76 Function-specific configfs interface
77 ------------------------------------
87 Ethernet over USB link
89 Ethernet over USB link
95 configuration. The ifname is read-only and contains the name of the interface
99 ------------------------
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/Documentation/devicetree/bindings/sound/
Drenesas,rsnd.txt1 Renesas R-Car sound
7 Renesas R-Car and RZ/G sound is constructed from below modules
10 SCU : Sampling Rate Converter Unit
11 - SRC : Sampling Rate Converter
12 - CMD
13 - CTU : Channel Transfer Unit
14 - MIX : Mixer
15 - DVC : Digital Volume and Mute Function
25 Multi channel is supported by Multi-SSI, or TDM-SSI.
27 Multi-SSI : 6ch case, you can use stereo x 3 SSI
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/Documentation/w1/
Dw1-generic.rst2 Introduction to the 1-wire (w1) subsystem
5 The 1-wire bus is a simple master-slave bus that communicates via a single
9 drain output and by sampling the logic level of the signal line.
18 - DS9490 usb device
19 - W1-over-GPIO
20 - DS2482 (i2c to w1 bridge)
21 - Emulated devices, such as a RS232 converter, parallel port adapter, etc
25 ------------------------------
29 - sysfs entries for that w1 master are created
30 - the w1 bus is periodically searched for new slave devices
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/Documentation/ioctl/
Dbotching-up-ioctls.rst5 From: http://blog.ffwll.ch/2013/11/botching-up-ioctls.html
13 Which is nice, since there's no more insanity in the form of fake-generic, but
19 only cover technicalities and not the big-picture issues like what the command
25 -------------
28 will need to add a 32-bit compat layer:
33 * Align everything to the natural size and use explicit padding. 32-bit
34 platforms don't necessarily align 64-bit values to 64-bit boundaries, but
35 64-bit platforms do. So we always need padding to the natural size to get
38 * Pad the entire struct to a multiple of 64-bits if the structure contains
39 64-bit types - the structure size will otherwise differ on 32-bit versus
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/Documentation/hwmon/
Dadm9240.rst10 Addresses scanned: I2C 0x2c - 0x2f
20 Addresses scanned: I2C 0x2c - 0x2f
24 http://pdfserv.maxim-ic.com/en/ds/DS1780.pdf
30 Addresses scanned: I2C 0x2c - 0x2f
37 - Frodo Looijaard <frodol@dds.nl>,
38 - Philip Edelbrock <phil@netroedge.com>,
39 - Michiel Rook <michiel@grendelproject.nl>,
40 - Grant Coady <gcoady.lk@gmail.com> with guidance
44 ---------
46 chip MSB 5-bit address. Each chip reports a unique manufacturer
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Dlm85.rst79 - Philip Pokorny <ppokorny@penguincomputing.com>,
80 - Frodo Looijaard <frodol@dds.nl>,
81 - Richard Barrington <rich_b_nz@clear.net.nz>,
82 - Margit Schubert-While <margitsw@t-online.de>,
83 - Justin Thiessen <jthiessen@penguincomputing.com>
86 -----------
92 The LM85 uses the 2-wire interface compatible with the SMBUS 2.0
94 temperatures and five (5) voltages. It has four (4) 16-bit counters for
95 measuring fan speed. Five (5) digital inputs are provided for sampling the
127 ----------------
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/Documentation/virt/kvm/
Dtimekeeping.txt2 Timekeeping Virtualization for X86-Based Architectures
28 information relevant to KVM and hardware-based virtualization.
38 2.1) i8254 - PIT
42 channels which can be programmed to deliver periodic or one-shot interrupts.
49 The PIT uses I/O ports 0x40 - 0x43. Access to the 16-bit counters is done
55 -------------- ----------------
57 | 1.1932 MHz |---------->| CLOCK OUT | ---------> IRQ 0
59 -------------- | +->| GATE TIMER 0 |
60 | ----------------
62 | ----------------
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/Documentation/media/uapi/mediactl/
Dmedia-types.rst4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
5 .. and no Back-Cover Texts. A copy of the license is included at
6 .. Documentation/media/uapi/fdl-appendix.rst.
8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
10 .. _media-controller-types:
17 .. _media-entity-functions:
18 .. _MEDIA-ENT-F-UNKNOWN:
19 .. _MEDIA-ENT-F-V4L2-SUBDEV-UNKNOWN:
20 .. _MEDIA-ENT-F-IO-V4L:
21 .. _MEDIA-ENT-F-IO-VBI:
[all …]
/Documentation/spi/
Dspi-summary.rst5 02-Feb-2012
8 ------------
17 clocking modes through which data is exchanged; mode-0 and mode-3 are most
32 - SPI may be used for request/response style device protocols, as with
35 - It may also be used to stream data in either direction (half duplex),
38 - Some devices may use eight bit words. Others may use different word
39 lengths, such as streams of 12-bit or 20-bit digital samples.
41 - Words are usually sent with their most significant bit (MSB) first,
44 - Sometimes SPI is used to daisy-chain devices, like shift registers.
51 SPI is only one of the names used by such four-wire protocols, and
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/Documentation/networking/
Dtimestamping.txt84 (e.g., for sampling) by embedding an send() call within two setsockopt
128 over-report measurement, because the timestamp is generated when all
169 is derived from a per-socket u32 counter (that wraps). For datagram
220 received the packet and its length at layer 2. A valid (non-zero)
255 cmsg->cmsg_level = SOL_SOCKET;
256 cmsg->cmsg_type = SO_TIMESTAMPING;
257 cmsg->cmsg_len = CMSG_LEN(sizeof(__u32));
284 correlating a timestamp with data is non-trivial. A range of bytes
313 relevant sequence number in skb_shinfo(skb)->tskey. Because an skbuff
364 feature. At least one field is non-zero at any time. Most timestamps
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Dcan.rst2 SocketCAN - Controller Area Network
20 .. _socketcan-motivation:
29 functionality. Usually, there is only a hardware-specific device
32 Queueing of frames and higher-level transport protocols like ISO-TP
34 character-device implementations support only one single process to
47 protocol family module and also vice-versa. Also, the protocol family
57 communicate using a specific transport protocol, e.g. ISO-TP, just
60 CAN-IDs, frames, etc.
62 Similar functionality visible from user-space could be provided by a
74 * **Abstraction:** In most existing character-device implementations, the
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Dfilter.txt5 ------------
12 BPF allows a user-space program to attach a filter onto any socket and
37 The biggest user of this construct might be libpcap. Issuing a high-level
38 filter command like `tcpdump -i em1 port 22` passes through the libpcap
40 via SO_ATTACH_FILTER to the kernel. `tcpdump -i em1 port 22 -ddd`
45 qdisc layer, SECCOMP-BPF (SECure COMPuting [1]), and lots of other places
48 [1] Documentation/userspace-api/seccomp_filter.rst
53 architecture for user-level packet capture. In Proceedings of the
56 CA, USA, 2-2. [http://www.tcpdump.org/papers/bpf-usenix93.pdf]
59 ---------
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