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/Documentation/ABI/testing/
Dsysfs-platform-mellanox-bootctl1 What: /sys/bus/platform/devices/MLNXBF04:00/lifecycle_state
6 The Life-cycle state of the SoC, which could be one of the
12 GA Non-Secured Non-Secure chip and not able to change state
16 What: /sys/bus/platform/devices/MLNXBF04:00/post_reset_wdog
25 What: /sys/bus/platform/devices/MLNXBF04:00/reset_action
39 What: /sys/bus/platform/devices/MLNXBF04:00/second_reset_action
56 What: /sys/bus/platform/devices/MLNXBF04:00/secure_boot_fuse_state
72 What: /sys/bus/platform/devices/MLNXBF04:00/bootfifo
79 What: /sys/bus/platform/devices/MLNXBF04:00/rsh_log
85 "[INFO|WARN|ERR|ASSERT ]<msg>". Log level 'INFO' is used by
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Dsysfs-driver-samsung-laptop1 What: /sys/devices/platform/samsung/performance_level
4 Contact: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
10 will show the current performance level. Writing to the
14 - "silent"
15 - "normal"
16 - "overclock"
23 What: /sys/devices/platform/samsung/battery_life_extender
27 Description: Max battery charge level can be modified, battery cycle
29 level.
31 - 0 means normal battery mode (100% charge)
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Dsysfs-platform-lg-laptop1 What: /sys/devices/platform/lg-laptop/reader_mode
4 Contact: "Matan Ziv-Av <matan@svgalib.org>
8 What: /sys/devices/platform/lg-laptop/fn_lock
11 Contact: "Matan Ziv-Av <matan@svgalib.org>
15 What: /sys/devices/platform/lg-laptop/battery_care_limit
18 Contact: "Matan Ziv-Av <matan@svgalib.org>
21 Maximal battery charge level. Accepted values are 80 or 100.
23 What: /sys/devices/platform/lg-laptop/fan_mode
26 Contact: "Matan Ziv-Av <matan@svgalib.org>
30 What: /sys/devices/platform/lg-laptop/usb_charge
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Dsysfs-platform-dfl-port1 What: /sys/bus/platform/devices/dfl-port.0/id
5 Description: Read-only. It returns id of this port. One DFL FPGA device
9 What: /sys/bus/platform/devices/dfl-port.0/afu_id
13 Description: Read-only. User can program different PR bitstreams to FPGA
18 What: /sys/bus/platform/devices/dfl-port.0/power_state
22 Description: Read-only. It reports the APx (AFU Power) state, different APx
23 means different throttling level. When reading this file, it
24 returns "0" - Normal / "1" - AP1 / "2" - AP2 / "6" - AP6.
26 What: /sys/bus/platform/devices/dfl-port.0/ap1_event
30 Description: Read-write. Read this file for AP1 (AFU Power State 1) event.
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Dsysfs-driver-ufs3 Contact: linux-scsi@vger.kernel.org
5 This file contains the auto-hibernate idle timer setting of a
6 UFS host controller. A value of '0' means auto-hibernate is not
11 10-bit values with a power-of-ten multiplier which allows a
15 What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_type
16 What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_type
25 What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_class
26 What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_class
35 What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_sub_class
36 What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_sub_class
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Dsysfs-driver-intc_sar1 What: /sys/bus/platform/devices/INTC1092:00/intc_reg
23 - The regulatory mode value has one of the above values.
24 - The default regulatory mode used in the driver is 0.
26 What: /sys/bus/platform/devices/INTC1092:00/intc_data
36 - device_mode
37 - bandtable_index
38 - antennatable_index
39 - sartable_index
44 level using the Band/Antenna/SAR table index information.
46 device-mode like laptop/tablet/clamshell etc. and the
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/Documentation/power/
Dbasic-pm-debugging.rst21 modes causes the PM core to skip some platform-related callbacks which on ACPI
24 "platform" mode::
26 # echo platform > /sys/power/disk
31 Unfortunately, the "platform" mode of hibernation does not work on some systems
41 If neither "platform" nor "shutdown" hibernation mode works, you will need to
45 ----------------------------
53 - test the freezing of processes
56 - test the freezing of processes and suspending of devices
58 platform
59 - test the freezing of processes, suspending of devices and platform
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/Documentation/devicetree/bindings/interrupt-controller/
Driscv,imsics.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/interrupt-controller/riscv,imsics.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: RISC-V Incoming MSI Controller (IMSIC)
10 - Anup Patel <anup@brainfault.org>
13 The RISC-V advanced interrupt architecture (AIA) defines a per-CPU incoming
14 MSI controller (IMSIC) for handling MSIs in a RISC-V platform. The RISC-V
15 AIA specification can be found at https://github.com/riscv/riscv-aia.
17 The IMSIC is a per-CPU (or per-HART) device with separate interrupt file
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/Documentation/admin-guide/pm/
Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
21 Depending on its configuration and the capabilities of the platform it runs on,
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
38 The system is woken up from this state by in-band interrupts, so theoretically
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
50 -------
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Dintel-speed-select.rst1 .. SPDX-License-Identifier: GPL-2.0
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
19 dynamically without pre-configuring via BIOS setup options. This dynamic
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
43 ------------
47 # intel-speed-select --help
49 The top-level help describes arguments and features. Notice that there is a
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Dsuspend-flows.rst1 .. SPDX-License-Identifier: GPL-2.0
12 At least one global system-wide transition needs to be carried out for the
14 :doc:`sleep states <sleep-states>`. Hibernation requires more than one
16 referred to as *system-wide suspend* (or simply *system suspend*) states, need
27 significant differences between the :ref:`suspend-to-idle <s2idle>` code flows
28 and the code flows related to the :ref:`suspend-to-RAM <s2ram>` and
31 The :ref:`suspend-to-RAM <s2ram>` and :ref:`standby <standby>` sleep states
32 cannot be implemented without platform support and the difference between them
33 boils down to the platform-specific actions carried out by the suspend and
34 resume hooks that need to be provided by the platform driver to make them
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/Documentation/devicetree/bindings/opp/
Dopp-v2-base.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/opp/opp-v2-base.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Viresh Kumar <viresh.kumar@linaro.org>
13 Devices work at voltage-current-frequency combinations and some implementations
25 pattern: '^opp-table(-[a-z0-9]+)?$'
27 opp-shared:
36 '^opp(-?[0-9]+)*$':
39 One or more OPP nodes describing voltage-current-frequency combinations.
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/Documentation/process/
Dmaintainer-soc.rst1 .. SPDX-License-Identifier: GPL-2.0
8 --------
10 The SoC subsystem is a place of aggregation for SoC-specific code.
13 * devicetrees for 32- & 64-bit ARM and RISC-V
14 * 32-bit ARM board files (arch/arm/mach*)
15 * 32- & 64-bit ARM defconfigs
16 * SoC-specific drivers across architectures, in particular for 32- & 64-bit
17 ARM, RISC-V and Loongarch
19 These "SoC-specific drivers" do not include clock, GPIO etc drivers that have
20 other top-level maintainers. The drivers/soc/ directory is generally meant
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/Documentation/devicetree/bindings/net/bluetooth/
Dmediatek,bluetooth.txt13 - compatible: Must be
14 "mediatek,mt7663u-bluetooth": for MT7663U device
15 "mediatek,mt7668u-bluetooth": for MT7668U device
16 - vcc-supply: Main voltage regulator
18 If the pin controller on the platform can support both pinmux and GPIO
19 control such as the most of MediaTek platform. Please use below properties.
21 - pinctrl-names: Should be "default", "runtime"
22 - pinctrl-0: Should contain UART RXD low when the device is powered up to
24 - pinctrl-1: Should contain UART mode pin ctrl
26 Else, the pin controller on the platform only can support pinmux control and
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/Documentation/userspace-api/
Dsysfs-platform_profile.rst2 Platform Profile Selection (e.g. /sys/firmware/acpi/platform_profile)
5 On modern systems the platform performance, temperature, fan and other
7 platform configuration is often automatically adjusted to the current
11 These auto platform adjustment mechanisms often can be configured with
12 one of several platform profiles, with either a bias towards low power
16 API for selecting the platform profile of these automatic mechanisms.
18 Note that this API is only for selecting the platform profile, it is
27 about any sub-optimal conditions which are impeding reaching the requested
28 performance level.
33 gets a consistent experience the sysfs-platform_profile ABI document defines
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/Documentation/ABI/stable/
Dsysfs-class-backlight9 - 0 (FB_BLANK_UNBLANK) : power on.
10 - 4 (FB_BLANK_POWERDOWN) : power off
20 show the brightness level stored in the driver, which
47 "platform": The driver uses a platform-specific interface
52 control should be preferred to platform control should
56 backlight state. Platform interfaces are mostly a
57 holdover from pre-standardisation of firmware
/Documentation/devicetree/bindings/sound/
Dmediatek,mt8365-mt6357.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/mediatek,mt8365-mt6357.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Alexandre Mergnat <amergnat@baylibre.com>
14 const: mediatek,mt8365-mt6357
16 pinctrl-names:
19 - const: default
20 - const: dmic
21 - const: miso_off
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Dmediatek,mt8188-mt6359.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/mediatek,mt8188-mt6359.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Trevor Wu <trevor.wu@mediatek.com>
13 - $ref: sound-card-common.yaml#
18 - mediatek,mt8188-es8326
19 - mediatek,mt8188-mt6359-evb
20 - mediatek,mt8188-nau8825
21 - mediatek,mt8188-rt5682s
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/Documentation/devicetree/bindings/
Djailhouse.txt1 Jailhouse non-root cell device tree bindings
2 --------------------------------------------
4 When running in a non-root Jailhouse cell (partition), the device tree of this
5 platform shall have a top-level "hypervisor" node with the following
8 - compatible = "jailhouse,cell"
/Documentation/devicetree/bindings/arm/
Dvexpress-scc.txt2 -----------------------------------------------------
4 Test chips for ARM Versatile Express platform implement SCC (Serial
11 like platform configuration control and power management.
15 - compatible value: "arm,vexpress-scc,<model>", "arm,vexpress-scc";
18 eg. for Coretile Express A15x2 A7x3 (V2P-CA15_A7):
19 compatible = "arm,vexpress-scc,v2p-ca15_a7", "arm,vexpress-scc";
23 - reg: when the SCC is memory mapped, physical address and size of the
25 - interrupts: when the SCC can generate a system-level interrupt
30 compatible = "arm,vexpress-scc,v2p-ca15_a7", "arm,vexpress-scc";
/Documentation/admin-guide/laptops/
Dlg-laptop.rst1 .. SPDX-License-Identifier: GPL-2.0+
7 By Matan Ziv-Av <matan@svgalib.org>
11 -------
15 - FN-F1 (LG control panel) - Generates F15
16 - FN-F5 (Touchpad toggle) - Generates F21
17 - FN-F6 (Airplane mode) - Generates RFKILL
18 - FN-F9 (Reader mode) - Generates F14
24 -----------
26 Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables
32 -------
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/Documentation/arch/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/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 :-
54 multiple re-usable component drivers :-
56 * Codec class drivers: The codec class driver is platform independent and
62 * Platform class drivers: The platform class driver includes the audio DMA
64 and any audio DSP drivers for that platform.
69 machine level audio events (e.g. turning on an amp at start of playback).
/Documentation/scsi/
Dscsi.rst1 .. SPDX-License-Identifier: GPL-2.0
9 https://www.tldp.org/HOWTO/SCSI-2.4-HOWTO . The LDP has single
18 The scsi-core (also known as the "mid level") contains the core of SCSI
27 The individual upper and lower level drivers can be loaded in any order
29 as a module). The disk driver (sd_mod.o), CD-ROM driver (sr_mod.o),
31 level drivers to support the various assorted devices which can be
36 The lower level drivers are the ones that support the individual cards that
37 are supported for the hardware platform that you are running under. Those
40 Adaptec. Almost all lower level drivers can be built either as modules or
/Documentation/virt/gunyah/
Dindex.rst1 .. SPDX-License-Identifier: GPL-2.0
10 message-queue
12 Gunyah is a Type-1 hypervisor which is independent of any OS kernel, and runs in
13 a more privileged CPU level (EL2 on Aarch64). It does not depend on a less
15 security and can support a much smaller trusted computing base than a Type-2
19 https://github.com/quic/gunyah-hypervisor.
23 - Scheduling:
25 A scheduler for virtual CPUs (vCPUs) on physical CPUs enables time-sharing
30 its own. The default is a real-time priority with round-robin scheduler.
31 2. "Proxy" scheduling in which an owner-VM can donate the remainder of its
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