| /linux/Documentation/userspace-api/gpio/ |
| H A D | sysfs.rst | 6 been moved to Documentation/ABI/obsolete/sysfs-gpio.
16 ----------------------
27 then changing its output state, then updating the code before re-enabling
38 Please read Documentation/driver-api/gpio/drivers-on-gpio.rst
44 --------------
47 - Control interfaces used to get userspace control over GPIOs;
49 - GPIOs themselves; and
51 - GPIO controllers ("gpio_chip" instances).
55 The control interfaces are write-only:
91 is configured as an output, this value may be written;
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| /linux/Documentation/admin-guide/media/ |
| H A D | fimc.rst | 1 .. SPDX-License-Identifier: GPL-2.0
8 Copyright |copy| 2012 - 2013 Samsung Electronics Co., Ltd.
17 drivers/media/platform/samsung/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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| H A D | rkisp1.rst | 1 .. SPDX-License-Identifier: GPL-2.0
14 rkisp1 and uses the Media-Controller API.
27 - RKISP1_V10: used at least in rk3288 and rk3399
28 - RKISP1_V11: declared in the original vendor code, but not used
29 - RKISP1_V12: used at least in rk3326 and px30
30 - RKISP1_V13: used at least in rk1808
36 .. kernel-figure:: rkisp1.dot
43 - rkisp1_mainpath: capture device for retrieving images, usually in higher
45 - rkisp1_selfpath: capture device for retrieving images.
46 - rkisp1_stats: a metadata capture device that sends statistics.
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| /linux/include/uapi/linux/usb/ |
| H A D | gadgetfs.h | 1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
3 * Filesystem based user-mode API to USB Gadget controller hardware
6 * on endpoint files found in one directory. They are configured by
8 * i/o requests. When ep0 is configured, the device can enumerate;
44 * both 32-bit and 64-bit kernels.
75 * complete when they're sitting in the FIFO unread.
|
| /linux/drivers/watchdog/ |
| H A D | riowd.c | 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* riowd.c - driver for hw watchdog inside Super I/O of RIO
27 * Controller) of the machine. The BBC can only be configured to
28 * trigger a power-on reset when the signal is asserted. The BBC
29 * can be configured to ignore the signal entirely as well.
32 * 0x05 (WDTO_INDEX) which is the watchdog time-out in minutes (1-255).
35 * re-set the watchdog else it will trigger.
39 * the watchdog control and can be used to make the watchdog timer re-set
71 spin_lock_irqsave(&p->lock, flags); in riowd_writereg()
72 writeb(index, p->regs + 0); in riowd_writereg()
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| /linux/arch/arc/kernel/ |
| H A D | intc-compact.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
18 * -Platform independent, needed for each CPU (not foldable into init_IRQ)
19 * -Called very early (start_kernel -> setup_arch -> setup_processor)
22 * -Optionally, setup the High priority Interrupts as Level 2 IRQs
32 * Write to register, even if no LV2 IRQs configured to reset it in arc_init_IRQ()
38 pr_info("Level-2 interrupts bitset %x\n", level_mask); in arc_init_IRQ()
54 * ARC700 core includes a simple on-chip intc supporting
55 * -per IRQ enable/disable
56 * -2 levels of interrupts (high/low)
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| /linux/drivers/pwm/ |
| H A D | pwm-atmel-tcb.c | 1 // SPDX-License-Identifier: GPL-2.0-only
72 struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm]; in atmel_tcb_pwm_request()
76 ret = clk_prepare_enable(tcbpwmc->clk); in atmel_tcb_pwm_request()
80 tcbpwm->duty = 0; in atmel_tcb_pwm_request()
81 tcbpwm->period = 0; in atmel_tcb_pwm_request()
82 tcbpwm->div = 0; in atmel_tcb_pwm_request()
84 guard(spinlock)(&tcbpwmc->lock); in atmel_tcb_pwm_request()
86 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr); in atmel_tcb_pwm_request()
89 * Timer Counter is already configured as a PWM generator. in atmel_tcb_pwm_request()
92 if (pwm->hwpwm == 0) in atmel_tcb_pwm_request()
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| /linux/Documentation/devicetree/bindings/usb/ |
| H A D | amlogic,meson-g12a-usb-ctrl.yaml | 1 # 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 <neil.armstrong@linaro.org>
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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| /linux/arch/arm/mach-pxa/ |
| H A D | mfp-pxa2xx.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
8 * the following MFP_xxx bit definitions in mfp.h are re-used for pxa2xx:
19 * bit 23 - Input/Output (PXA2xx specific)
20 * bit 24 - Wakeup Enable(PXA2xx specific)
21 * bit 25 - Keep Output (PXA2xx specific)
34 * Note: MFP_LPM_KEEP_OUTPUT has no effect on pins configured for input.
49 /* NOTE: pins configured as output _must_ provide a low power state,
58 * Note: pins configured as GPIO are always initialized to input
|
| /linux/Documentation/networking/ |
| H A D | arcnet.rst | 1 .. 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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| /linux/Documentation/sound/soc/ |
| H A D | overview.rst | 6 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 :-
|
| /linux/include/net/ |
| H A D | nsh.h | 10 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
12 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
14 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
18 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
27 * discussion of MPLS-related forwarding requirements.
32 * example [I-D.ietf-sfc-oam-framework] for one approach).
34 * The O bit MUST be set for OAM packets and MUST NOT be set for non-OAM
50 * configurable via the control plane; the configured initial value can
65 * Length: The total length, in 4-byte words, of NSH including the Base
77 * 0x0 - This is a reserved value. Implementations SHOULD silently
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| /linux/Documentation/power/ |
| H A D | suspend-and-interrupts.rst | 10 -----------------------------------
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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| /linux/Documentation/arch/x86/ |
| H A D | intel_txt.rst | 6 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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| /linux/arch/s390/pci/ |
| H A D | pci_event.c | 1 // SPDX-License-Identifier: GPL-2.0
69 mutex_lock(&zdev->kzdev_lock); in is_passed_through()
70 ret = !!zdev->kzdev; in is_passed_through()
71 mutex_unlock(&zdev->kzdev_lock); in is_passed_through()
78 if (!driver || !driver->err_handler) in is_driver_supported()
80 if (!driver->err_handler->error_detected) in is_driver_supported()
90 ers_res = driver->err_handler->error_detected(pdev, pdev->error_state); in zpci_event_notify_error_detected()
119 if (driver->err_handler->mmio_enabled) in zpci_event_do_error_state_clear()
120 ers_res = driver->err_handler->mmio_enabled(pdev); in zpci_event_do_error_state_clear()
125 pr_info("%s: Automatic recovery failed after MMIO re-enable\n", in zpci_event_do_error_state_clear()
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| /linux/drivers/acpi/ |
| H A D | spcr.c | 1 // SPDX-License-Identifier: GPL-2.0-only
32 if (memcmp(h->oem_id, "QCOM ", ACPI_OEM_ID_SIZE)) in qdf2400_erratum_44_present()
35 if (!memcmp(h->oem_table_id, "QDF2432 ", ACPI_OEM_TABLE_ID_SIZE)) in qdf2400_erratum_44_present()
38 if (!memcmp(h->oem_table_id, "QDF2400 ", ACPI_OEM_TABLE_ID_SIZE) && in qdf2400_erratum_44_present()
39 h->oem_revision == 1) in qdf2400_erratum_44_present()
46 * APM X-Gene v1 and v2 UART hardware is an 16550 like device but has its
47 * register aligned to 32-bit. In addition, the BIOS also encoded the
54 if (tb->interface_type != ACPI_DBG2_16550_COMPATIBLE) in xgene_8250_erratum_present()
57 if (memcmp(tb->header.oem_id, "APMC0D", ACPI_OEM_ID_SIZE) && in xgene_8250_erratum_present()
58 memcmp(tb->header.oem_id, "HPE ", ACPI_OEM_ID_SIZE)) in xgene_8250_erratum_present()
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| /linux/Documentation/virt/kvm/x86/ |
| H A D | running-nested-guests.rst | 1 .. SPDX-License-Identifier: GPL-2.0
8 can be KVM-based or a different hypervisor). The straightforward
12 .----------------. .----------------.
17 |----------------'--'----------------|
22 .------------------------------------------------------.
25 |------------------------------------------------------|
27 '------------------------------------------------------'
31 - L0 – level-0; the bare metal host, running KVM
33 - L1 – level-1 guest; a VM running on L0; also called the "guest
36 - L2 – level-2 guest; a VM running on L1, this is the "nested guest"
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| /linux/drivers/usb/serial/ |
| H A D | keyspan_usa28msg.h | 1 /* SPDX-License-Identifier: BSD-3-Clause */
5 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
6 This file is available under a BSD-style copyright
19 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
21 This file is available under a BSD-style copyright
45 USB OUT (host -> USA28, transmit) messages contain a
48 If the port is configured for parity, the data will be an
63 USB IN (USA28 -> host, receive) messages contain data and parity
70 If parity is not configured, the format is:
88 2000jun01 add extended BSD-style copyright text
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| /linux/Documentation/driver-api/crypto/iaa/ |
| H A D | iaa-crypto.rst | 1 .. SPDX-License-Identifier: GPL-2.0
18 higher-level compression devices such as zswap.
25 represented by selecting the 'deflate-iaa' crypto compression
28 # echo deflate-iaa > /sys/module/zswap/parameters/compressor
38 'deflate-iaa'. (Because the IAA hardware has a 4k history-window
52 Cryptographic API -> Hardware crypto devices -> Support for Intel(R) IAA Compression Accelerator
59 …Cryptographic API -> Hardware crypto devices -> Support for Intel(R) IAA Compression -> Enable Int…
78 - Scalable
79 - Legacy
80 - No IOMMU
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| /linux/Documentation/networking/dsa/ |
| H A D | bcm_sf2.rst | 8 - 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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| /linux/Documentation/driver-api/gpio/ |
| H A D | intro.rst | 17 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
25 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
26 non-dedicated pin can be configured as a GPIO; and most chips have at least
31 Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
32 firmware knowing how they're used).
36 - Output values are writable (high=1, low=0). Some chips also have
38 value might be driven, supporting "wire-OR" and similar schemes for the
41 - Input values are likewise readable (1, 0). Some chips support readback
42 of pins configured as "output", which is very useful in such "wire-OR"
44 input de-glitch/debounce logic, sometimes with software controls.
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| /linux/Documentation/driver-api/cxl/platform/acpi/ |
| H A D | cedt.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 CEDT - CXL Early Discovery Table
8 regions configured at boot by the BIOS.
21 Associated host bridge : 00000007 <- Host bridge _UID
31 describes any inter-host-bridge interleave configuration that may have been
40 Window base address : 000000C050000000 <- Memory Region
42 Interleave Members (2^n) : 01 <- Interleave configuration
48 First Target : 00000007 <- Host Bridge _UID
49 Next Target : 00000006 <- Host Bridge _UID
58 Bit[4]: Fixed Config (HPA cannot be re-used)
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| /linux/Documentation/driver-api/dmaengine/ |
| H A D | dmatest.rst | 15 The dmatest module can be configured to test a specific channel. It can also
21 capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
22 (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
28 Part 1 - How to build the test module
33 Device Drivers -> DMA Engine support -> DMA Test client
38 Part 2 - When dmatest is built as a module
57 Example of multi-channel test usage (new in the 5.0 kernel)::
68 For all tests, starting in the 5.0 kernel, either single- or multi-channel,
80 % ls -1 /sys/class/dma/
103 % modprobe -r dmatest
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| /linux/Documentation/driver-api/firmware/ |
| H A D | firmware_cache.rst | 6 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
|
| /linux/Documentation/driver-api/virtio/ |
| H A D | virtio.rst | 1 .. SPDX-License-Identifier: GPL-2.0
24 Device - Driver communication: virtqueues
28 hypervisor, they're exposed to the guest as if they are physical devices
29 using a specific transport method -- PCI, MMIO or CCW -- that is
40 .. kernel-doc:: include/uapi/linux/virtio_ring.h
56 .. kernel-doc:: include/linux/virtio.h
63 a virtqueue during the virtqueue setup process (transport-specific).
65 .. kernel-doc:: drivers/virtio/virtio_ring.c
73 transport-specific drivers like `virtio-pci` and `virtio-mmio`. Then
77 How a virtio device is found and configured by the kernel depends on how
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