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linux
ST DWC3 glue logic This file documents the parameters for the dwc3-st driver. This driver controls the glue logic used to configure the dwc3 core on STiH407 based platforms. Required properties: - compatible : must be "st,stih407-dwc3" - reg : glue logic base address and USB syscfg ctrl register offset - reg-name...
Documentation/devicetree/bindings/usb/dwc3-st.txt
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linux
ST USB EHCI controller Required properties: - compatible : must be "st,st-ehci-300x" - reg : physical base addresses of the controller and length of memory mapped region - interrupts : one EHCI interrupt should be described here - pinctrl-names : a pinctrl state named "default" must be defined - pinctrl-...
Documentation/devicetree/bindings/usb/ehci-st.txt
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linux
USB Peripheral Controller driver for Aeroflex Gaisler GRUSBDC. The GRUSBDC USB Device Controller core is available in the GRLIB VHDL IP core library. Note: In the ordinary environment for the core, a Leon SPARC system, these properties are built from information in the AMBA plug&play. Required properties: - name : ...
Documentation/devicetree/bindings/usb/gr-udc.txt
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linux
HiSilicon STB xHCI The device node for HiSilicon STB xHCI host controller Required properties: - compatible: should be "hisilicon,hi3798cv200-xhci" - reg: specifies physical base address and size of the registers - interrupts : interrupt used by the controller - clocks: a list of phandle + clock-specifier pairs, ...
Documentation/devicetree/bindings/usb/hisilicon,histb-xhci.txt
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linux
Broadcom IPROC USB Device controller. The device node is used for UDCs integrated into Broadcom's iProc family (Northstar2, Cygnus) of SoCs'. The UDC is based on Synopsys Designware Cores AHB Subsystem Device Controller IP. Required properties: - compatible: Add the compatibility strings for supported platforms. ...
Documentation/devicetree/bindings/usb/iproc-udc.txt
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linux
Maxim Integrated SPI-based USB 2.0 host controller MAX3421E Required properties: - compatible: Should be "maxim,max3421" - spi-max-frequency: maximum frequency for this device must not exceed 26 MHz. - reg: chip select number to which this device is connected. - maxim,vbus-en-pin: <GPOUTx ACTIVE_LEVEL> GPOUTx i...
Documentation/devicetree/bindings/usb/maxim,max3421.txt
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linux
OCTEON/OCTEON+ USB BLOCK 1) Main node Required properties: - compatible: must be "cavium,octeon-5750-usbn" - reg: specifies the physical base address of the USBN block and the length of the memory mapped region. - #address-cells: specifies the number of cells needed to encode an address. The ...
Documentation/devicetree/bindings/usb/octeon-usb.txt
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linux
DA8XX USB OHCI controller Required properties: - compatible: Should be "ti,da830-ohci" - reg: Should contain one register range i.e. start and length - interrupts: Description of the interrupt line - phys: Phandle for the PHY device - phy-names: Should be "usb-phy" Optional properties: - vbus-sup...
Documentation/devicetree/bindings/usb/ohci-da8xx.txt
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linux
ST USB OHCI controller Required properties: - compatible : must be "st,st-ohci-300x" - reg : physical base addresses of the controller and length of memory mapped region - interrupts : one OHCI controller interrupt should be described here - clocks : phandle list of usb clocks - clock-names : should b...
Documentation/devicetree/bindings/usb/ohci-st.txt
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linux
OMAP GLUE AND OTHER OMAP SPECIFIC COMPONENTS OMAP MUSB GLUE - compatible : Should be "ti,omap4-musb" or "ti,omap3-musb" - ti,hwmods : must be "usb_otg_hs" - multipoint : Should be "1" indicating the musb controller supports multipoint. This is a MUSB configuration-specific setting. - num-eps : Specifies the num...
Documentation/devicetree/bindings/usb/omap-usb.txt
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linux
PXA USB controllers OHCI Required properties: - compatible: Should be "marvell,pxa-ohci" for USB controllers used in host mode. Optional properties: - "marvell,enable-port1", "marvell,enable-port2", "marvell,enable-port3" If present, enables the appropriate USB port of the controller. - "marvell,port-mode" ...
Documentation/devicetree/bindings/usb/pxa-usb.txt
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linux
Richtek RT1711H TypeC PD Controller. Required properties: - compatible : Must be "richtek,rt1711h". - reg : Must be 0x4e, it's slave address of RT1711H. - interrupts : <a b> where a is the interrupt number and b represents an encoding of the sense and level information for the interrupt. Required sub-node: - co...
Documentation/devicetree/bindings/usb/richtek,rt1711h.txt
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linux
ULPI bus binding ---------------- Phys that are behind a ULPI connection can be described with the following binding. The host controller shall have a "ulpi" named node as a child, and that node shall have one enabled node underneath it representing the ulpi device on the bus. EXAMPLE ------- usb { compatible = "ve...
Documentation/devicetree/bindings/usb/ulpi.txt
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linux
SMSC USB4604 High-Speed Hub Controller Required properties: - compatible: Should be "smsc,usb4604" Optional properties: - reg: Specifies the i2c slave address, it is required and should be 0x2d if I2C is used. - reset-gpios: Should specify GPIO for reset. - initial-mode: Should specify initial mode. ...
Documentation/devicetree/bindings/usb/usb4604.txt
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linux
Ux500 MUSB Required properties: - compatible : Should be "stericsson,db8500-musb" - reg : Offset and length of registers - interrupts : Interrupt; mode, number and trigger - dr_mode : Dual-role; either host mode "host", peripheral mode "peripheral" or both "otg" Optional properties: - d...
Documentation/devicetree/bindings/usb/ux500-usb.txt
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linux
* OMAP HDQ One wire bus master controller Required properties: - compatible : should be "ti,omap3-1w" or "ti,am4372-hdq" - reg : Address and length of the register set for the device - interrupts : interrupt line. - ti,hwmods : "hdq1w" Optional properties: - ti,mode: should be "hdq": HDQ mode "1w": one-wire mode. ...
Documentation/devicetree/bindings/w1/omap-hdq.txt
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linux
Generic devicetree bindings for onewire (w1) busses =================================================== Onewire busses are described through nodes of their master bus controller. Slave devices are listed as sub-nodes of such master devices. For now, only one slave is allowed per bus master. Example: charger: charg...
Documentation/devicetree/bindings/w1/w1.txt
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linux
Bindings for MEN A21 Watchdog device connected to GPIO lines Required properties: - compatible: "men,a021-wdt" - gpios: Specifies the pins that control the Watchdog, order: 1: Watchdog enable 2: Watchdog fast-mode 3: Watchdog trigger 4: Watchdog reset cause bit 0 5: Watchdog reset cause bit 1 6: Watchdog r...
Documentation/devicetree/bindings/watchdog/men-a021-wdt.txt
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linux
* Microchip PIC32 Deadman Timer The deadman timer is used to reset the processor in the event of a software malfunction. It is a free-running instruction fetch timer, which is clocked whenever an instruction fetch occurs until a count match occurs. Required properties: - compatible: must be "microchip,pic32mzda-dmt"....
Documentation/devicetree/bindings/watchdog/microchip,pic32-dmt.txt
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linux
* Microchip PIC32 Watchdog Timer When enabled, the watchdog peripheral can be used to reset the device if the WDT is not cleared periodically in software. Required properties: - compatible: must be "microchip,pic32mzda-wdt". - reg: physical base address of the controller and length of memory mapped region. - clocks...
Documentation/devicetree/bindings/watchdog/microchip,pic32-wdt.txt
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linux
STMicroelectronics Low Power Controller (LPC) - Watchdog ======================================================== LPC currently supports Watchdog OR Real Time Clock OR Clocksource functionality. [See: ../rtc/rtc-st-lpc.txt for RTC options] [See: ../timer/st,stih407-lpc for Clocksource options] Required properties -...
Documentation/devicetree/bindings/watchdog/st_lpc_wdt.txt
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linux
Technologic Systems Watchdog Required properties: - compatible: must be "technologic,ts4800-wdt" - syscon: phandle / integer array that points to the syscon node which describes the FPGA's syscon registers. - phandle to FPGA's syscon - offset to the watchdog register Optional property: -...
Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt
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linux
CE4100 Device Tree Bindings --------------------------- The CE4100 SoC uses for in core peripherals the following compatible format: <vendor>,<chip>-<device>. Many of the "generic" devices like HPET or IO APIC have the ce4100 name in their compatible property because they first appeared in this SoC. The CPU nodes ---...
Documentation/devicetree/bindings/x86/ce4100.txt
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linux
Timers ------ * High Precision Event Timer (HPET) Required property: compatible = "intel,ce4100-hpet";
Documentation/devicetree/bindings/x86/timer.txt
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linux
* Xillybus driver for generic FPGA interface Required properties: - compatible: Should be "xillybus,xillybus-1.00.a" - reg: Address and length of the register set for the device - interrupts: Contains one interrupt node, typically consisting of three cells. Optional properties: - dma-coherent: Present if DMA operatio...
Documentation/devicetree/bindings/xillybus/xillybus.txt
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linux
.. SPDX-License-Identifier: GPL-2.0 Checking for needed translation updates ======================================= This script helps track the translation status of the documentation in different locales, i.e., whether the documentation is up-to-date with the English counterpart. How it works ------------ It uses ...
Documentation/doc-guide/checktransupdate.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 How to help improve kernel documentation ======================================== Documentation is an important part of any software-development project. Good documentation helps to bring new developers in and helps established developers work more effectively. Without top-quality...
Documentation/doc-guide/contributing.rst
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linux
.. _doc_guide: ================================= How to write kernel documentation ================================= .. toctree:: :maxdepth: 1 sphinx kernel-doc parse-headers contributing maintainer-profile checktransupdate
Documentation/doc-guide/index.rst
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linux
.. title:: Kernel-doc comments =========================== Writing kernel-doc comments =========================== The Linux kernel source files may contain structured documentation comments in the kernel-doc format to describe the functions, types and design of the code. It is easier to keep documentation up-to-date...
Documentation/doc-guide/kernel-doc.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 Documentation subsystem maintainer entry profile ================================================ The documentation "subsystem" is the central coordinating point for the kernel's documentation and associated infrastructure. It covers the hierarchy under Documentation/ (with the ex...
Documentation/doc-guide/maintainer-profile.rst
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linux
=========================== Including uAPI header files =========================== Sometimes, it is useful to include header files and C example codes in order to describe the userspace API and to generate cross-references between the code and the documentation. Adding cross-references for userspace API files has an ...
Documentation/doc-guide/parse-headers.rst
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linux
.. _sphinxdoc: ===================================== Using Sphinx for kernel documentation ===================================== The Linux kernel uses `Sphinx`_ to generate pretty documentation from `reStructuredText`_ files under ``Documentation``. To build the documentation in HTML or PDF formats, use ``make htmldo...
Documentation/doc-guide/sphinx.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 Managing Ownership of the Framebuffer Aperture ============================================== .. kernel-doc:: drivers/video/aperture.c :doc: overview .. kernel-doc:: include/linux/aperture.h :internal: .. kernel-doc:: drivers/video/aperture.c :export:
Documentation/driver-api/aperture.rst
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linux
.. SPDX-License-Identifier: GPL-2.0-only .. _auxiliary_bus: ============= Auxiliary Bus ============= .. kernel-doc:: drivers/base/auxiliary.c :doc: PURPOSE When Should the Auxiliary Bus Be Used ===================================== .. kernel-doc:: drivers/base/auxiliary.c :doc: USAGE Auxiliary Device Crea...
Documentation/driver-api/auxiliary_bus.rst
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linux
Driver Basics ============= Driver Entry and Exit points ---------------------------- .. kernel-doc:: include/linux/module.h :internal: Driver device table ------------------- .. kernel-doc:: include/linux/mod_devicetable.h :internal: :no-identifiers: pci_device_id Delaying and scheduling routines ------...
Documentation/driver-api/basics.rst
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linux
======================== The Common Clk Framework ======================== :Author: Mike Turquette <mturquette@ti.com> This document endeavours to explain the common clk framework details, and how to port a platform over to this framework. It is not yet a detailed explanation of the clock api in include/linux/clk.h,...
Documentation/driver-api/clk.rst
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linux
.. _component: ====================================== Component Helper for Aggregate Drivers ====================================== .. kernel-doc:: drivers/base/component.c :doc: overview API === .. kernel-doc:: include/linux/component.h :internal: .. kernel-doc:: drivers/base/component.c :export:
Documentation/driver-api/component.rst
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.. SPDX-License-Identifier: GPL-2.0 ================ Kernel Connector ================ Kernel connector - new netlink based userspace <-> kernel space easy to use communication module. The Connector driver makes it easy to connect various agents using a netlink based network. One must register a callback and an ide...
Documentation/driver-api/connector.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 =============== Console Drivers =============== The Linux kernel has 2 general types of console drivers. The first type is assigned by the kernel to all the virtual consoles during the boot process. This type will be called 'system driver', and only one system driver is allowed to...
Documentation/driver-api/console.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 ======================== Device Frequency Scaling ======================== Introduction ------------ This framework provides a standard kernel interface for Dynamic Voltage and Frequency Switching on arbitrary devices. It exposes controls for adjusting frequency through sysfs fil...
Documentation/driver-api/devfreq.rst
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linux
.. Copyright 2001 Matthew Wilcox .. .. This documentation is free software; you can redistribute .. it and/or modify it under the terms of the GNU General Public .. License as published by the Free Software Foundation; either .. version 2 of the License, or (at your option) any later .. version. ==...
Documentation/driver-api/device-io.rst
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linux
.. _device_link: ============ Device links ============ By default, the driver core only enforces dependencies between devices that are borne out of a parent/child relationship within the device hierarchy: When suspending, resuming or shutting down the system, devices are ordered based on this relationship, i.e. chil...
Documentation/driver-api/device_link.rst
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linux
Buffer Sharing and Synchronization (dma-buf) ============================================ The dma-buf subsystem provides the framework for sharing buffers for hardware (DMA) access across multiple device drivers and subsystems, and for synchronizing asynchronous hardware access. As an example, it is used extensively ...
Documentation/driver-api/dma-buf.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 =============================== The Linux kernel dpll subsystem =============================== DPLL ==== PLL - Phase Locked Loop is an electronic circuit which syntonizes clock signal of a device with an external clock signal. Effectively enabling device to run on the same clock ...
Documentation/driver-api/dpll.rst
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linux
Error Detection And Correction (EDAC) Devices ============================================= Main Concepts used at the EDAC subsystem ---------------------------------------- There are several things to be aware of that aren't at all obvious, like *sockets, *socket sets*, *banks*, *rows*, *chip-select rows*, *channels...
Documentation/driver-api/edac.rst
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linux
================ EISA bus support ================ :Author: Marc Zyngier <maz@wild-wind.fr.eu.org> This document groups random notes about porting EISA drivers to the new EISA/sysfs API. Starting from version 2.5.59, the EISA bus is almost given the same status as other much more mainstream buses such as PCI or USB....
Documentation/driver-api/eisa.rst
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linux
======================= Extcon Device Subsystem ======================= Overview ======== The Extcon (External Connector) subsystem provides a unified framework for managing external connectors in Linux systems. It allows drivers to report the state of external connectors and provides a standardized interface for use...
Documentation/driver-api/extcon.rst
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linux
=========================================== Firewire (IEEE 1394) driver Interface Guide =========================================== Introduction and Overview ========================= The Linux FireWire subsystem adds some interfaces into the Linux system to use/maintain+any resource on IEEE 1394 bus. The main purp...
Documentation/driver-api/firewire.rst
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linux
Frame Buffer Library ==================== The frame buffer drivers depend heavily on four data structures. These structures are declared in include/linux/fb.h. They are fb_info, fb_var_screeninfo, fb_fix_screeninfo and fb_monospecs. The last three can be made available to and from userland. fb_info defines the curren...
Documentation/driver-api/frame-buffer.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 ========================= Generic Counter Interface ========================= Introduction ============ Counter devices are prevalent among a diverse spectrum of industries. The ubiquitous presence of these devices necessitates a common interface and standard of interaction and ex...
Documentation/driver-api/generic-counter.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 ======================== Generic Radix Page Table ======================== .. kernel-doc:: include/linux/generic_pt/common.h :doc: Generic Radix Page Table .. kernel-doc:: drivers/iommu/generic_pt/pt_defs.h :doc: Generic Page Table Language Usage ===== Generic PT is structured...
Documentation/driver-api/generic_pt.rst
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linux
High Speed Synchronous Serial Interface (HSI) ============================================= Introduction --------------- High Speed Synchronous Interface (HSI) is a full duplex, low latency protocol, that is optimized for die-level interconnect between an Application Processor and a Baseband chipset. It has been spec...
Documentation/driver-api/hsi.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 ================================================= Recoverable Hardware Error Tracking in vmcoreinfo ================================================= Overview -------- This feature provides a generic infrastructure within the Linux kernel to track and log recoverable hardware erro...
Documentation/driver-api/hw-recoverable-errors.rst
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linux
I\ :sup:`2`\ C and SMBus Subsystem ================================== I\ :sup:`2`\ C (or without fancy typography, "I2C") is an acronym for the "Inter-IC" bus, a simple bus protocol which is widely used where low data rate communications suffice. Since it's also a licensed trademark, some vendors use another name (suc...
Documentation/driver-api/i2c.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 ============================== Driver implementer's API guide ============================== The kernel offers a wide variety of interfaces to support the development of device drivers. This document is an only somewhat organized collection of some of those interfaces — it will ho...
Documentation/driver-api/index.rst
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linux
=========================================== InfiniBand and Remote DMA (RDMA) Interfaces =========================================== Introduction and Overview ========================= TBD InfiniBand core interfaces ========================== .. kernel-doc:: drivers/infiniband/core/iwpm_util.h :internal: .. ker...
Documentation/driver-api/infiniband.rst
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Device drivers infrastructure ============================= The Basic Device Driver-Model Structures ---------------------------------------- .. kernel-doc:: include/linux/device.h :internal: :no-identifiers: device_link_state .. kernel-doc:: include/linux/device/bus.h :identifiers: bus_type bus_notifier_ev...
Documentation/driver-api/infrastructure.rst
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linux
Input Subsystem =============== Input core ---------- .. kernel-doc:: include/linux/input.h :internal: .. kernel-doc:: drivers/input/input.c :export: .. kernel-doc:: drivers/input/ff-core.c :export: .. kernel-doc:: drivers/input/ff-memless.c :export: Multitouch Library ------------------ .. kernel-do...
Documentation/driver-api/input.rst
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linux
.. SPDX-License-Identifier: GPL-2.0 ===================================== Generic System Interconnect Subsystem ===================================== Introduction ------------ This framework is designed to provide a standard kernel interface to control the settings of the interconnects on an SoC. These settings can ...
Documentation/driver-api/interconnect.rst
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linux
======================== The io_mapping functions ======================== API === The io_mapping functions in linux/io-mapping.h provide an abstraction for efficiently mapping small regions of an I/O device to the CPU. The initial usage is to support the large graphics aperture on 32-bit processors where ioremap_wc ...
Documentation/driver-api/io-mapping.rst
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linux
============================================== Ordering I/O writes to memory-mapped addresses ============================================== On some platforms, so-called memory-mapped I/O is weakly ordered. On such platforms, driver writers are responsible for ensuring that I/O writes to memory-mapped addresses on th...
Documentation/driver-api/io_ordering.rst
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linux
====================== ioctl based interfaces ====================== ioctl() is the most common way for applications to interface with device drivers. It is flexible and easily extended by adding new commands and can be passed through character devices, block devices as well as sockets and other special file descripto...
Documentation/driver-api/ioctl.rst
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linux
============================== IPMB Driver for a Satellite MC ============================== The Intelligent Platform Management Bus or IPMB, is an I2C bus that provides a standardized interconnection between different boards within a chassis. This interconnection is between the baseboard management (BMC) and chassis ...
Documentation/driver-api/ipmb.rst
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linux
===================== The Linux IPMI Driver ===================== :Author: Corey Minyard <minyard@mvista.com> / <minyard@acm.org> The Intelligent Platform Management Interface, or IPMI, is a standard for controlling intelligent devices that monitor a system. It provides for dynamic discovery of sensors in the system ...
Documentation/driver-api/ipmi.rst
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linux
=========== ISA Drivers =========== The following text is adapted from the commit message of the initial commit of the ISA bus driver authored by Rene Herman. During the recent "isa drivers using platform devices" discussion it was pointed out that (ALSA) ISA drivers ran into the problem of not having the option to f...
Documentation/driver-api/isa.rst
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linux
======================== libATA Developer's Guide ======================== :Author: Jeff Garzik Introduction ============ libATA is a library used inside the Linux kernel to support ATA host controllers and devices. libATA provides an ATA driver API, class transports for ATA and ATAPI devices, and SCSI<->ATA transla...
Documentation/driver-api/libata.rst
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linux
============================ The Common Mailbox Framework ============================ :Author: Jassi Brar <jaswinder.singh@linaro.org> This document aims to help developers write client and controller drivers for the API. But before we start, let us note that the client (especially) and controller drivers are likely...
Documentation/driver-api/mailbox.rst
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linux
================= MEN Chameleon Bus ================= .. Table of Contents ================= 1 Introduction 1.1 Scope of this Document 1.2 Limitations of the current implementation 2 Architecture 2.1 MEN Chameleon Bus 2.2 Carrier Devices 2.3 Parser 3 Resource handling ...
Documentation/driver-api/men-chameleon-bus.rst
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linux
Message-based devices ===================== Fusion message devices ---------------------- .. kernel-doc:: drivers/message/fusion/mptbase.c :export: .. kernel-doc:: drivers/message/fusion/mptscsih.c :export:
Documentation/driver-api/message-based.rst
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linux
Parallel Port Devices ===================== .. kernel-doc:: include/linux/parport.h :internal: .. kernel-doc:: drivers/parport/ieee1284.c :export: .. kernel-doc:: drivers/parport/share.c :export: .. kernel-doc:: drivers/parport/daisy.c :internal: 16x50 UART Driver ================= .. kernel-doc:: dri...
Documentation/driver-api/miscellaneous.rst
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linux
===================================== MTD NAND Driver Programming Interface ===================================== :Author: Thomas Gleixner Introduction ============ The generic NAND driver supports almost all NAND and AG-AND based chips and connects them to the Memory Technology Devices (MTD) subsystem of the Linux ...
Documentation/driver-api/mtdnand.rst
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linux
=========== NTB Drivers =========== NTB (Non-Transparent Bridge) is a type of PCI-Express bridge chip that connects the separate memory systems of two or more computers to the same PCI-Express fabric. Existing NTB hardware supports a common feature set: doorbell registers and memory translation windows, as well as non...
Documentation/driver-api/ntb.rst
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.. SPDX-License-Identifier: GPL-2.0 =============== NVMEM Subsystem =============== Srinivas Kandagatla <srinivas.kandagatla@linaro.org> This document explains the NVMEM Framework along with the APIs provided, and how to use it. 1. Introduction =============== *NVMEM* is the abbreviation for Non Volatile Memory la...
Documentation/driver-api/nvmem.rst
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linux
=============================== PARPORT interface documentation =============================== :Time-stamp: <2000-02-24 13:30:20 twaugh> Described here are the following functions: Global functions:: parport_register_driver parport_unregister_driver parport_enumerate parport_register_device parport_unreg...
Documentation/driver-api/parport-lowlevel.rst
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=============================== PINCTRL (PIN CONTROL) subsystem =============================== This document outlines the pin control subsystem in Linux This subsystem deals with: - Enumerating and naming controllable pins - Multiplexing of pins, pads, fingers (etc) see below for details - Configuration of pins, ...
Documentation/driver-api/pin-control.rst
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.. SPDX-License-Identifier: GPL-2.0 ====================== PPS - Pulse Per Second ====================== Copyright (C) 2007 Rodolfo Giometti <giometti@enneenne.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Softw...
Documentation/driver-api/pps.rst
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.. SPDX-License-Identifier: GPL-2.0 =========================================== PTP hardware clock infrastructure for Linux =========================================== This patch set introduces support for IEEE 1588 PTP clocks in Linux. Together with the SO_TIMESTAMPING socket options, this presents a standardi...
Documentation/driver-api/ptp.rst
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====================================== Pulse Width Modulation (PWM) interface ====================================== This provides an overview about the Linux PWM interface PWMs are commonly used for controlling LEDs, fans or vibrators in cell phones. PWMs with a fixed purpose have no need implementing the Linux PWM ...
Documentation/driver-api/pwm.rst
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.. SPDX-License-Identifier: GPL-2.0-only .. Copyright 2024 Linaro Ltd. ==================== Power Sequencing API ==================== :Author: Bartosz Golaszewski Introduction ============ This framework is designed to abstract complex power-up sequences that are shared between multiple logical devices in the Linux...
Documentation/driver-api/pwrseq.rst
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.. Copyright 2007-2008 Wolfson Microelectronics .. This documentation is free software; you can redistribute .. it and/or modify it under the terms of the GNU General Public .. License version 2 as published by the Free Software Foundation. ================================= Voltage and current regulator API ===...
Documentation/driver-api/regulator.rst
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.. SPDX-License-Identifier: GPL-2.0-only ==================== Reset controller API ==================== Introduction ============ Reset controllers are central units that control the reset signals to multiple peripherals. The reset controller API is split into two parts: the `consumer driver interface <#consumer-dri...
Documentation/driver-api/reset.rst
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=============================== rfkill - RF kill switch support =============================== .. contents:: :depth: 2 Introduction ============ The rfkill subsystem provides a generic interface for disabling any radio transmitter in the system. When a transmitter is blocked, it shall not radiate any power. Th...
Documentation/driver-api/rfkill.rst
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=================================== Writing s390 channel device drivers =================================== :Author: Cornelia Huck Introduction ============ This document describes the interfaces available for device drivers that drive s390 based channel attached I/O devices. This includes interfaces for interaction...
Documentation/driver-api/s390-drivers.rst
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===================== SCSI Interfaces Guide ===================== :Author: James Bottomley :Author: Rob Landley Introduction ============ Protocol vs bus --------------- Once upon a time, the Small Computer Systems Interface defined both a parallel I/O bus and a data protocol to connect a wide variety of peripheral...
Documentation/driver-api/scsi.rst
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============================ Linux kernel SLIMbus support ============================ Overview ======== What is SLIMbus? ---------------- SLIMbus (Serial Low Power Interchip Media Bus) is a specification developed by MIPI (Mobile Industry Processor Interface) alliance. The bus uses master/slave configuration, and is...
Documentation/driver-api/slimbus.rst
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.. include:: <isonum.txt> ============ SM501 Driver ============ :Copyright: |copy| 2006, 2007 Simtec Electronics The Silicon Motion SM501 multimedia companion chip is a multifunction device which may provide numerous interfaces including USB host controller USB gadget, asynchronous serial ports, audio functions, an...
Documentation/driver-api/sm501.rst
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Serial Peripheral Interface (SPI) ================================= SPI is the "Serial Peripheral Interface", widely used with embedded systems because it is a simple and efficient interface: basically a multiplexed shift register. Its three signal wires hold a clock (SCK, often in the range of 1-20 MHz), a "Master Ou...
Documentation/driver-api/spi.rst
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======================== Linux Switchtec Support ======================== Microsemi's "Switchtec" line of PCI switch devices is already supported by the kernel with standard PCI switch drivers. However, the Switchtec device advertises a special management endpoint which enables some additional functionality. This incl...
Documentation/driver-api/switchtec.rst
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=================== Sync File API Guide =================== :Author: Gustavo Padovan <gustavo at padovan dot org> This document serves as a guide for device drivers writers on what the sync_file API is, and how drivers can support it. Sync file is the carrier of the fences(struct dma_fence) that are needed to synchro...
Documentation/driver-api/sync_file.rst
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================================= target and iSCSI Interfaces Guide ================================= Introduction and Overview ========================= TBD Target core device interfaces ============================= This section is blank because no kerneldoc comments have been added to drivers/target/target_core_...
Documentation/driver-api/target.rst
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.. SPDX-License-Identifier: GPL-2.0 =============================================== TEE (Trusted Execution Environment) driver API =============================================== Kernel provides a TEE bus infrastructure where a Trusted Application is represented as a device identified via Universally Unique Identifie...
Documentation/driver-api/tee.rst
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======================= The Userspace I/O HOWTO ======================= :Author: Hans-Jürgen Koch Linux developer, Linutronix :Date: 2006-12-11 About this document =================== Translations ------------ If you know of any translations for this document, or you are interested in translating it, please email...
Documentation/driver-api/uio-howto.rst
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.. SPDX-License-Identifier: GPL-2.0-only .. include:: <isonum.txt> ===================== VFIO Mediated devices ===================== :Copyright: |copy| 2016, NVIDIA CORPORATION. All rights reserved. :Author: Neo Jia <cjia@nvidia.com> :Author: Kirti Wankhede <kwankhede@nvidia.com> Virtual Function I/O (VFIO) Mediat...
Documentation/driver-api/vfio-mediated-device.rst
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.. SPDX-License-Identifier: GPL-2.0 Acceptance criteria for vfio-pci device specific driver variants ================================================================ Overview -------- The vfio-pci driver exists as a device agnostic driver using the system IOMMU and relying on the robustness of platform fault handling...
Documentation/driver-api/vfio-pci-device-specific-driver-acceptance.rst
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================================== VFIO - "Virtual Function I/O" [1]_ ================================== Many modern systems now provide DMA and interrupt remapping facilities to help ensure I/O devices behave within the boundaries they've been allotted. This includes x86 hardware with AMD-Vi and Intel VT-d, POWER sy...
Documentation/driver-api/vfio.rst
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VME Device Drivers ================== Driver registration ------------------- As with other subsystems within the Linux kernel, VME device drivers register with the VME subsystem, typically called from the devices init routine. This is achieved via a call to :c:func:`vme_register_driver`. A pointer to a structure o...
Documentation/driver-api/vme.rst
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====================== W1: Dallas' 1-wire bus ====================== :Author: David Fries W1 API internal to the kernel ============================= include/linux/w1.h ~~~~~~~~~~~~~~~~~~ W1 kernel API functions. .. kernel-doc:: include/linux/w1.h :internal: drivers/w1/w1.c ~~~~~~~~~~~~~~~ W1 core functions. ...
Documentation/driver-api/w1.rst
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.. SPDX-License-Identifier: GPL-2.0-or-later ================================= WBRF - Wifi Band RFI Mitigations ================================= Due to electrical and mechanical constraints in certain platform designs there may be likely interference of relatively high-powered harmonics of the GPU memory clocks with...
Documentation/driver-api/wbrf.rst
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.. SPDX-License-Identifier: GPL-2.0-or-later ============== WMI Driver API ============== The WMI driver core supports a more modern bus-based interface for interacting with WMI devices, and an older GUID-based interface. The latter interface is considered to be deprecated, so new WMI drivers should generally avoid i...
Documentation/driver-api/wmi.rst
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========================================== Xillybus driver for generic FPGA interface ========================================== :Author: Eli Billauer, Xillybus Ltd. (http://xillybus.com) :Email: eli.billauer@gmail.com or as advertised on Xillybus' site. .. Contents: - Introduction -- Background -- Xillybus Ov...
Documentation/driver-api/xillybus.rst
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