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/Documentation/admin-guide/gpio/
Dsysfs.rst7 Documentation/ABI/obsolete/sysfs-gpio AND NEW USERSPACE CONSUMERS
16 ------------------------
27 then changing its output state, then updating the code before re-enabling
37 PLEASE READ THE DOCUMENT AT Documentation/driver-api/gpio/drivers-on-gpio.rst
41 --------------
44 - Control interfaces used to get userspace control over GPIOs;
46 - GPIOs themselves; and
48 - GPIO controllers ("gpio_chip" instances).
52 The control interfaces are write-only:
88 is configured as an output, this value may be written;
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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
31 features :-
38 core and are subsequently matched and configured when the application
54 multiple re-usable component drivers :-
/Documentation/admin-guide/media/
Dfimc.rst1 .. SPDX-License-Identifier: GPL-2.0
8 Copyright |copy| 2012 - 2013 Samsung Electronics Co., Ltd.
17 drivers/media/platform/exynos4-is directory.
20 --------------
22 S5PC100 (mem-to-mem only), S5PV210, Exynos4210
25 ------------------
27 - camera parallel interface capture (ITU-R.BT601/565);
28 - camera serial interface capture (MIPI-CSI2);
29 - memory-to-memory processing (color space conversion, scaling, mirror
31 - dynamic pipeline re-configuration at runtime (re-attachment of any FIMC
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Drkisp1.rst1 .. SPDX-License-Identifier: GPL-2.0
14 and uses the Media-Controller API.
20 .. kernel-figure:: rkisp1.dot
27 - rkisp1_mainpath: capture device for retrieving images, usually in higher
29 - rkisp1_selfpath: capture device for retrieving images.
30 - rkisp1_stats: a metadata capture device that sends statistics.
31 - rkisp1_params: a metadata output device that receives parameters
36 - rkisp1_resizer_mainpath: used to resize and downsample frames for the
38 - rkisp1_resizer_selfpath: used to resize and downsample frames for the
40 - rkisp1_isp: is connected to the sensor and is responsible for all the isp
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Dfaq.rst1 .. SPDX-License-Identifier: GPL-2.0
11 avoid confusion, we're calling *transponders* as the physical
28 is closed). The ``dvb-core`` module parameter ``dvb_shutdown_timeout``
37 tools and are grouped together with the ``v4l-utils`` git repository:
39 https://git.linuxtv.org/v4l-utils.git/
48 for example the ``dvbv5-scan`` tool. You can find more information
51 https://www.linuxtv.org/wiki/index.php/Dvbv5-scan
70 https://git.linuxtv.org/dtv-scan-tables.git
88 list with a tool like ``dvbv5-scan``.
90 Almost all modern Digital TV cards don't have built-in hardware
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/Documentation/devicetree/bindings/media/
Dsamsung-s5k5baf.txt2 --------------------------------------------------------------------
6 - compatible : "samsung,s5k5baf";
7 - reg : I2C slave address of the sensor;
8 - vdda-supply : analog power supply 2.8V (2.6V to 3.0V);
9 - vddreg-supply : regulator input power supply 1.8V (1.7V to 1.9V)
11 - vddio-supply : I/O power supply 1.8V (1.65V to 1.95V)
13 - stbyn-gpios : GPIO connected to STDBYN pin;
14 - rstn-gpios : GPIO connected to RSTN pin;
15 - clocks : list of phandle and clock specifier pairs
17 clocks described in clock-names;
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/Documentation/driver-api/firmware/
Dfirmware_cache.rst6 re-initialize devices. During resume there may be a period of time during which
45 the old value you had configured after the cache is set up.
47 * Upon suspend any pending non-uevent firmware requests are killed to avoid
49 calls requiring the non-uevent therefore need to implement their own firmware
/Documentation/devicetree/bindings/usb/
Damlogic,meson-g12a-usb-ctrl.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
4 ---
5 $id: "http://devicetree.org/schemas/usb/amlogic,meson-g12a-usb-ctrl.yaml#"
6 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
11 - Neil Armstrong <narmstrong@baylibre.com>
14 The Amlogic G12A embeds a DWC3 USB IP Core configured for USB2 and USB3
15 in host-only mode, and a DWC2 IP Core configured for USB2 peripheral mode
20 One of the USB2 PHYs can be re-routed in peripheral mode to a DWC2 USB IP.
25 The Amlogic A1 embeds a DWC3 USB IP Core configured for USB2 in
26 host-only mode.
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/Documentation/w1/slaves/
Dw1_ds28e17.rst7 * Maxim DS28E17 1-Wire-to-I2C Master Bridge
19 -----------
30 SUBSYSTEM=="i2c-dev", KERNEL=="i2c-[0-9]*", ATTRS{name}=="w1-19-*", \
31 SYMLINK+="i2c-$attr{name}"
33 may be used to create stable /dev/i2c- entries based on the unique id of the
40 This sets up the default I2C speed a DS28E17 get configured for as soon
41 it is connected. The power-on default of the DS28E17 is 400kBaud, but
42 chips may come and go on the Onewire bus without being de-powered and
44 reconnected DS28E17 device on the Onewire bus, it will re-apply this
55 needed timeout cannot be pre-calculated correctly. As the w1_ds28e17
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/Documentation/power/
Dsuspend-and-interrupts.rst10 -----------------------------------
14 ->prepare, ->suspend and ->suspend_late callbacks have been executed for all
29 Device IRQs are re-enabled during system resume, right before the "early" phase
30 of resuming devices (that is, before starting to execute ->resume_early
35 ------------------------
38 suspend-resume cycle, including the "noirq" phases of suspending and resuming
41 but also to IPIs and to some other special-purpose interrupts.
44 requesting a special-purpose interrupt. It causes suspend_device_irqs() to
46 expected during the suspend-resume cycle, but does not guarantee that the
47 interrupt will wake the system from a suspended state -- for such cases it is
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/Documentation/x86/
Dintel_txt.rst6 Technology (Intel(R) TXT), defines platform-level enhancements that
13 - Provides dynamic root of trust for measurement (DRTM)
14 - Data protection in case of improper shutdown
15 - Measurement and verification of launched environment
18 non-vPro systems. It is currently available on desktop systems
30 - LinuxTAG 2008:
31 http://www.linuxtag.org/2008/en/conf/events/vp-donnerstag.html
33 - TRUST2008:
34 http://www.trust-conference.eu/downloads/Keynote-Speakers/
35 3_David-Grawrock_The-Front-Door-of-Trusted-Computing.pdf
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/Documentation/networking/dsa/
Dbcm_sf2.rst8 - xDSL gateways such as BCM63138
9 - streaming/multimedia Set Top Box such as BCM7445
10 - Cable Modem/residential gateways such as BCM7145/BCM3390
13 ports, offering a range of built-in and customizable interfaces:
15 - single integrated Gigabit PHY
16 - quad integrated Gigabit PHY
17 - quad external Gigabit PHY w/ MDIO multiplexer
18 - integrated MoCA PHY
19 - several external MII/RevMII/GMII/RGMII interfaces
22 fail-over not to lose packets during a MoCA role re-election, as well as out of
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Ddsa.rst19 they configured/queried a switch port network device or a regular network
22 An Ethernet switch is typically comprised of multiple front-panel ports, and one
27 gateways, or even top-of-the rack switches. This host Ethernet controller will
36 For each front-panel port, DSA will create specialized network devices which are
37 used as controlling and data-flowing endpoints for use by the Linux networking
46 - what port is this frame coming from
47 - what was the reason why this frame got forwarded
48 - how to send CPU originated traffic to specific ports
52 on Port-based VLAN IDs).
57 - the "cpu" port is the Ethernet switch facing side of the management
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/Documentation/networking/
Darcnet.rst1 .. SPDX-License-Identifier: GPL-2.0
9 See also arcnet-hardware.txt in this directory for jumper-setting
10 and cabling information if you're like many of us and didn't happen to get a
25 ARCnet 0.32 ALPHA first made it into the Linux kernel 1.1.80 - this was
36 If you don't e-mail me about your success/failure soon, I may be forced to
40 If you think so, why not flame me in a quick little e-mail? Please also
41 include the type of card(s) you're using, software, size of network, and
44 My e-mail address is: apenwarr@worldvisions.ca
55 The previous release resulted from many months of on-and-off effort from me
58 ARCnet 2.10 ALPHA, Tomasz's all-new-and-improved RFC1051 support has been
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/Documentation/driver-api/gpio/
Dlegacy.rst13 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
21 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
22 non-dedicated pin can be configured as a GPIO; and most chips have at least
27 Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
28 firmware knowing how they're used).
32 - Output values are writable (high=1, low=0). Some chips also have
34 value might be driven ... supporting "wire-OR" and similar schemes
37 - Input values are likewise readable (1, 0). Some chips support readback
38 of pins configured as "output", which is very useful in such "wire-OR"
40 input de-glitch/debounce logic, sometimes with software controls.
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Dintro.rst16 - The descriptor-based interface is the preferred way to manipulate GPIOs,
17 and is described by all the files in this directory excepted gpio-legacy.txt.
18 - The legacy integer-based interface which is considered deprecated (but still
19 usable for compatibility reasons) is documented in gpio-legacy.txt.
21 The remainder of this document applies to the new descriptor-based interface.
22 gpio-legacy.txt contains the same information applied to the legacy
23 integer-based interface.
29 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
37 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
38 non-dedicated pin can be configured as a GPIO; and most chips have at least
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/Documentation/virt/kvm/
Drunning-nested-guests.rst6 can be KVM-based or a different hypervisor). The straightforward
10 .----------------. .----------------.
15 |----------------'--'----------------|
20 .------------------------------------------------------.
23 |------------------------------------------------------|
25 '------------------------------------------------------'
29 - L0 – level-0; the bare metal host, running KVM
31 - L1 – level-1 guest; a VM running on L0; also called the "guest
34 - L2 – level-2 guest; a VM running on L1, this is the "nested guest"
46 This document will stick with the three-level terminology (L0,
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/Documentation/arm/samsung-s3c24xx/
Dsuspend.rst7 ------------
9 The S3C24XX supports a low-power suspend mode, where the SDRAM is kept
10 in Self-Refresh mode, and all but the essential peripheral blocks are
16 ------------
29 --------
42 ---------------
53 There is currently no support for over-riding the default method of
74 "button-irq-eint0", NULL);
83 ---------
91 2) While the pm code itself will attempt to re-enable the UART clocks,
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/Documentation/admin-guide/
Dinitrd.rst15 where the kernel comes up with a minimum set of compiled-in drivers, and
23 ---------
51 Boot command-line options
52 -------------------------
70 Note: /dev/initrd is read-only and it can only be used once. As soon
80 ----------------------
88 find . | cpio --quiet -H newc -o | gzip -9 -n > /boot/imagefile.img
94 gzip -cd /boot/imagefile.img | cpio -imd --quiet
97 ------------
108 you're building an install floppy), the root file system creation
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/Documentation/networking/device_drivers/ethernet/amazon/
Dena.rst1 .. SPDX-License-Identifier: GPL-2.0
17 The driver supports a range of ENA devices, is link-speed independent
21 Some ENA devices support SR-IOV. This driver is used for both the
22 SR-IOV Physical Function (PF) and Virtual Function (VF) devices.
26 is advertised by the device via the Admin Queue), a dedicated MSI-X
32 Receive-side scaling (RSS) is supported for multi-core scaling.
39 Some of the ENA devices support a working mode called Low-latency
54 ena_regs_defs.h Definition of ENA PCI memory-mapped (MMIO) registers.
66 - PCIe Configuration Space
67 - Device Registers
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/Documentation/devicetree/bindings/pinctrl/
Dpinctrl-single.txt1 One-register-per-pin type device tree based pinctrl driver
4 - compatible : "pinctrl-single" or "pinconf-single".
5 "pinctrl-single" means that pinconf isn't supported.
6 "pinconf-single" means that generic pinconf is supported.
8 - reg : offset and length of the register set for the mux registers
10 - #pinctrl-cells : number of cells in addition to the index, set to 1
11 for pinctrl-single,pins and 2 for pinctrl-single,bits
13 - pinctrl-single,register-width : pinmux register access width in bits
15 - pinctrl-single,function-mask : mask of allowed pinmux function bits
19 - pinctrl-single,function-off : function off mode for disabled state if
[all …]
/Documentation/driver-api/dmaengine/
Ddmatest.rst11 capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
12 (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
18 Part 1 - How to build the test module
23 Device Drivers -> DMA Engine support -> DMA Test client
28 Part 2 - When dmatest is built as a module
47 Example of multi-channel test usage (new in the 5.0 kernel)::
58 For all tests, starting in the 5.0 kernel, either single- or multi-channel,
70 % ls -1 /sys/class/dma/
93 % modprobe -r dmatest
99 % modprobe -r dmatest
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/Documentation/ABI/testing/
Dsysfs-bus-iio-counter-104-quad-87 Contact: linux-iio@vger.kernel.org
16 Contact: linux-iio@vger.kernel.org
21 normal, range limit, non-recycle, and modulo-n. The preset value
36 Non-recycle:
37 Counter is disabled whenever a 24-bit count overflow or
38 underflow takes place. The counter is re-enabled when a
42 Modulo-N:
52 Contact: linux-iio@vger.kernel.org
56 Read-only attribute that indicates whether excessive noise is
58 irrelevant in non-quadrature clock mode.
[all …]
/Documentation/devicetree/bindings/media/xilinx/
Dxlnx,csi2rxss.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Xilinx MIPI CSI-2 Receiver Subsystem
10 - Vishal Sagar <vishal.sagar@xilinx.com>
13 The Xilinx MIPI CSI-2 Receiver Subsystem is used to capture MIPI CSI-2
16 The subsystem consists of a MIPI D-PHY in slave mode which captures the
17 data packets. This is passed along the MIPI CSI-2 Rx IP which extracts the
20 For more details, please refer to PG232 Xilinx MIPI CSI-2 Receiver Subsystem.
21 Please note that this bindings includes only the MIPI CSI-2 Rx controller
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/Documentation/virt/kvm/devices/
Darm-vgic-its.rst1 .. SPDX-License-Identifier: GPL-2.0
10 The ITS allows MSI(-X) interrupts to be injected into guests. This extension is
12 arm-vgic-v3.txt), but does not depend on having physical ITS controllers.
15 a separate, non-overlapping MMIO region.
22 -------------------------
25 KVM_VGIC_ITS_ADDR_TYPE (rw, 64-bit)
33 -E2BIG Address outside of addressable IPA range
34 -EINVAL Incorrectly aligned address
35 -EEXIST Address already configured
36 -EFAULT Invalid user pointer for attr->addr.
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