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/Documentation/devicetree/bindings/regulator/
Drichtek,rtq2208.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Alina Yu <alina_yu@richtek.com>
14 multi-configurable synchronous buck converters and two LDOs.
16 Bucks support "regulator-allowed-modes" and "regulator-mode". The former defines the permitted
17 switching operation in normal mode; the latter defines the operation in suspend to RAM mode.
19 No matter the RTQ2208 is configured to normal or suspend to RAM mode, there are two switching
20 operation modes for all buck rails, automatic power saving mode (Auto mode) and forced continuous
25 0 - Auto mode for power saving, which reducing the switching frequency at light load condition
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Drichtek,rt5739.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Richtek RT5739 Step-Down Buck Converter
10 - ChiYuan Huang <cy_huang@richtek.com>
13 The RT5739 is a step-down switching buck converter that can deliver the
19 - $ref: regulator.yaml#
24 - richtek,rt5733
25 - richtek,rt5739
30 enable-gpios:
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/Documentation/devicetree/bindings/extcon/
Dextcon-rt8973a.txt2 * Richtek RT8973A - Micro USB Switch device
7 speed USB operation. Also, RT8973A support 'auto-configuration' mode.
8 If auto-configuration mode is enabled, RT8973A would control internal h/w patch
9 for USB D-/D+ switching.
12 - compatible: Should be "richtek,rt8973a-muic"
13 - reg: Specifies the I2C slave address of the MUIC block. It should be 0x14
14 - interrupts: Interrupt specifiers for detection interrupt sources.
19 compatible = "richtek,rt8973a-muic";
20 interrupt-parent = <&gpx1>;
/Documentation/devicetree/bindings/leds/backlight/
Dqcom-wled.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Bjorn Andersson <andersson@kernel.org>
11 - Kiran Gunda <quic_kgunda@quicinc.com>
21 - qcom,pm8941-wled
22 - qcom,pmi8950-wled
23 - qcom,pmi8994-wled
24 - qcom,pmi8998-wled
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/Documentation/fb/
Dgxfb.rst16 * Most important: boot logo :-)
26 Switching modes is done using gxfb.mode_option=<resolution>... boot
36 XF68_FBDev should generally work fine, but it is non-accelerated.
48 <x>x<y>[-<bpp>][@<refresh>]
49 vram size of video ram (normally auto-detected)
50 vt_switch enable vt switching during suspend/resume. The vt
Dlxfb.rst17 * Most important: boot logo :-)
27 Switching modes is done using lxfb.mode_option=<resolution>... boot
37 XF68_FBDev should generally work fine, but it is non-accelerated.
49 <x>x<y>[-<bpp>][@<refresh>]
50 vram size of video ram (normally auto-detected)
51 vt_switch enable vt switching during suspend/resume. The vt
/Documentation/devicetree/bindings/usb/
Dusb251xb.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Microchip USB 2.0 Hi-Speed Hub Controller
10 - Richard Leitner <richard.leitner@skidata.com>
15 - microchip,usb2422
16 - microchip,usb2512b
17 - microchip,usb2512bi
18 - microchip,usb2513b
19 - microchip,usb2513bi
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/Documentation/hwmon/
Dmax20730.rst1 .. SPDX-License-Identifier: GPL-2.0-or-later
12 Addresses scanned: -
20 Addresses scanned: -
28 Addresses scanned: -
36 Addresses scanned: -
40 Author: Guenter Roeck <linux@roeck-us.net>
44 -----------
47 Integrated, Step-Down Switching Regulators with PMBus support.
54 -----------
56 This driver does not auto-detect devices. You will have to instantiate the
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Df71882fg.rst103 This is the 64-pin variant of the F71889FG, they have the
119 -----------
133 ----------
136 interface as documented in sysfs-interface, without any exceptions.
140 -----------
142 Both PWM (pulse-width modulation) and DC fan speed control methods are
149 vica versa. So the temperature zone trip points 1-4 (or 1-2) go from high temp
154 voltage) mode, where 0-100% duty cycle (0-100% of 12V) is specified. And RPM
156 gets specified as 0-100% of the fan#_full_speed file.
158 Since both modes work in a 0-100% (mapped to 0-255) scale, there isn't a
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/Documentation/devicetree/bindings/net/
Dti,k3-am654-cpsw-nuss.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/net/ti,k3-am654-cpsw-nuss.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Siddharth Vadapalli <s-vadapalli@ti.com>
11 - Roger Quadros <rogerq@kernel.org>
17 (two external) and provides Ethernet packet communication and switching.
22 Complex (UDMA-P) controller.
35 VLAN support, 802.1Q compliant, Auto add port VLAN for untagged frames on
36 ingress, Auto VLAN removal on egress and auto pad to minimum frame size.
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/Documentation/driver-api/driver-model/
Doverview.rst16 bus-specific drivers for bridges and devices by consolidating a set of data
19 Traditional driver models implemented some sort of tree-like structure
33 on an x86-compatible system can work within this paradigm. Of course,
43 and sometimes by the device-specific drivers.
60 they're doing when switching between the bus driver and the global driver,
93 The auto-mounting of sysfs is typically accomplished by an entry similar to
98 or something similar in the /lib/init/fstab file on Debian-based systems::
104 # mount -t sysfs sysfs /sys
107 This directory may be populated at each layer of discovery - the global layer,
110 The global layer currently creates two files - 'name' and 'power'. The
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/Documentation/sound/cards/
Dhdspm.rst2 Software Interface ALSA-DSP MADI Driver
5 (translated from German, so no good English ;-),
7 2004 - winfried ritsch
11 the Controls and startup-options are ALSA-Standard and only the
19 ------------------
21 * number of channels -- depends on transmission mode
29 * Single Speed -- 1..64 channels
37 * Double Speed -- 1..32 channels
40 Note: Choosing the 56-channel mode for
41 transmission/receive-mode , only 28 are transmitted/received
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/Documentation/sound/hd-audio/
Dnotes.rst2 More Notes on HD-Audio Driver
11 HD-audio is the new standard on-board audio component on modern PCs
12 after AC97. Although Linux has been supporting HD-audio since long
15 This document explains the brief trouble-shooting and debugging
16 methods for the HD-audio hardware.
18 The HD-audio component consists of two parts: the controller chip and
19 the codec chips on the HD-audio bus. Linux provides a single driver
20 for all controllers, snd-hda-intel. Although the driver name contains
21 a word of a well-known hardware vendor, it's not specific to it but for
22 all controller chips by other companies. Since the HD-audio
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/Documentation/networking/device_drivers/ethernet/mellanox/mlx5/
Dkconfig.rst1 .. SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
34 | built-in into mlx5_core.ko.
39 …g (DCB) Support <https://enterprise-support.nvidia.com/s/article/howto-auto-config-pfc-and-ets-on-…
53 | Flow-based classifiers, such as those registered through
54 | `tc-flower(8)`, are processed by the device, rather than the
61 | Enables Hardware-accelerated receive flow steering (arfs) support, and ntuple filtering.
62 | https://enterprise-support.nvidia.com/s/article/howto-configure-arfs-on-connectx-4
67 | Enables :ref:`IPSec XFRM cryptography-offload acceleration <xfrm_device>`.
72 | Build support for MACsec cryptography-offload acceleration in the NIC.
83 | TLS cryptography-offload acceleration.
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/Documentation/driver-api/media/
Dv4l2-controls.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ------------
31 sub-device drivers.
35 ------------------------
48 Basic usage for V4L2 and sub-device drivers
49 -------------------------------------------
53 .. code-block:: c
55 #include <media/v4l2-ctrls.h>
57 1.1) Add the handler to your driver's top-level struct:
61 .. code-block:: c
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/Documentation/driver-api/usb/
Dpower-management.rst1 .. _usb-power-management:
7 :Date: Last-updated: February 2014
11 ---------
17 * Changing the default idle-delay time
31 -------------------------
35 component is ``suspended`` it is in a nonfunctional low-power state; it
37 ``resumed`` (returned to a functional full-power state) when the kernel
67 ----------------------
85 --------------------------
101 -------------------
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/Documentation/admin-guide/laptops/
Dthinkpad-acpi.rst9 - Borislav Deianov <borislav@users.sf.net>
10 - Henrique de Moraes Holschuh <hmh@hmh.eng.br>
12 http://ibm-acpi.sf.net/
19 This driver used to be named ibm-acpi until kernel 2.6.21 and release
20 0.13-20070314. It used to be in the drivers/acpi tree, but it was
21 moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
25 The driver is named "thinkpad-acpi". In some places, like module
29 "tpacpi" is used as a shorthand where "thinkpad-acpi" would be too
33 ------
38 - Fn key combinations
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/Documentation/admin-guide/
Dsvga.rst7 :Copyright: |copy| 1995--1999 Martin Mares, <mj@ucw.cz>
22 remember its mode ID (the four-digit hexadecimal number) and then
31 NORMAL_VGA - Standard 80x25 mode available on all display adapters.
33 EXTENDED_VGA - Standard 8-pixel font mode: 80x43 on EGA, 80x50 on VGA.
35 ASK_VGA - Display a video mode menu upon startup (see below).
37 0..35 - Menu item number (when you have used the menu to view the list of
41 modes are listed in a "first detected -- first displayed" manner. It's
44 0x.... - Hexadecimal video mode ID (also displayed on the menu, see below
46 hexadecimal numbers -- you have to convert it to decimal manually.
59 Video adapter: <name-of-detected-video-adapter>
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Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
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/Documentation/devicetree/bindings/mfd/
Dx-powers,axp152.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/mfd/x-powers,axp152.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: X-Powers AXP PMIC
10 - Chen-Yu Tsai <wens@csie.org>
13 - if:
18 - x-powers,axp152
19 - x-powers,axp202
20 - x-powers,axp209
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/Documentation/networking/device_drivers/can/ctu/
Dctucanfd-driver.rst1 .. SPDX-License-Identifier: GPL-2.0-or-later
10 ------------------------
19 `Vivado integration <https://gitlab.fel.cvut.cz/canbus/zynq/zynq-can-sja1000-top>`_
20 and Intel Cyclone V 5CSEMA4U23C6 based DE0-Nano-SoC Terasic board
21 `QSys integration <https://gitlab.fel.cvut.cz/canbus/intel-soc-ctucanfd>`_
23 `PCIe integration <https://gitlab.fel.cvut.cz/canbus/pcie-ctucanfd>`_ of the core.
33 version of emulation support can be cloned from ctu-canfd branch of QEMU local
34 development `repository <https://gitlab.fel.cvut.cz/canbus/qemu-canbus>`_.
38 ---------------
59 it allows for device hot-plug.
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/Documentation/networking/device_drivers/ethernet/stmicro/
Dstmmac.rst1 .. SPDX-License-Identifier: GPL-2.0+
13 - In This Release
14 - Feature List
15 - Kernel Configuration
16 - Command Line Parameters
17 - Driver Information and Notes
18 - Debug Information
19 - Support
33 (and older) and DesignWare(R) Cores Ethernet Quality-of-Service version 4.0
35 DesignWare(R) Cores XGMAC - 10G Ethernet MAC and DesignWare(R) Cores
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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
13 groups (switching back to time distribution when needed to keep
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
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/Documentation/networking/
Dl2tp.rst1 .. SPDX-License-Identifier: GPL-2.0
58 --------------
93 -----------
105 32-bit id. L2TP tunnel ids are given by ``L2TP_ATTR_CONN_ID`` and
109 instances, the L2TPv2 16-bit tunnel/session id is cast to a 32-bit
122 ``L2TP_CMD_TUNNEL_CREATE`` attributes:-
152 ``L2TP_CMD_TUNNEL_DESTROY`` attributes:-
160 ``L2TP_CMD_TUNNEL_MODIFY`` attributes:-
169 ``L2TP_CMD_TUNNEL_GET`` attributes:-
178 ``L2TP_CMD_SESSION_CREATE`` attributes:-
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/Documentation/ABI/testing/
Dsysfs-bus-usb10 This allows to avoid side-effects with drivers
28 drivers, non-authorized one are not. By default, wired
33 Contact: linux-usb@vger.kernel.org
67 What: /sys/bus/usb-serial/drivers/.../new_id
69 Contact: linux-usb@vger.kernel.org
72 extra bus folder "usb-serial" in sysfs; apart from that
85 device. This is useful to ensure auto probing won't
97 If CONFIG_PM is set and a USB 2.0 lpm-capable device is plugged
113 If CONFIG_PM is set and a USB 3.0 lpm-capable device is plugged
141 attribute allows user-space to know whether the device is
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