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/Documentation/devicetree/bindings/input/
Dmicrochip,qt1050.txt1 Microchip AT42QT1050 Five-channel Touch Sensor IC
4 one to five keys, dependent on mode. The QT1050 includes all signal processing
11 - compatible: Must be "microchip,qt1050"
12 - reg: The I2C address of the device
13 - interrupts: The sink for the touchpad's IRQ output,
14 see ../interrupt-controller/interrupts.txt
17 - wakeup-source: touch keys can be used as a wakeup source
19 Each button (key) is represented as a sub-node:
25 - linux,code: Keycode to emit.
26 - reg: The key number. Valid values: 0, 1, 2, 3, 4.
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Diqs269a.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jeff LaBundy <jeff@labundy.com>
13 The Azoteq IQS269A is an 8-channel capacitive touch controller that features
14 additional Hall-effect and inductive sensing capabilities.
28 "#address-cells":
31 "#size-cells":
34 azoteq,hall-enable:
37 Enables Hall-effect sensing on channels 6 and 7. In this case, keycodes
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/Documentation/hwmon/
Dlochnagar.rst10 -----------
12 Lochnagar 2 features built-in Current Monitor circuitry that allows for the
13 measurement of both voltage and current on up to eight of the supply voltage
22 ----------------
30 power1_average Measured average power for DBVDD1 (microWatts)
37 power2_average Measured average power for 1V8 DSP (microWatts)
44 power3_average Measured average power for 1V8 CDC (microWatts)
51 power4_average Measured average power for VDDCORE DSP (microWatts)
58 power5_average Measured average power for AVDD 1V8 (microWatts)
63 power6_average Measured average power for SYSVDD (microWatts)
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Dlm25066.rst10 Addresses scanned: -
22 Addresses scanned: -
34 Addresses scanned: -
44 Addresses scanned: -
54 Addresses scanned: -
61 Author: Guenter Roeck <linux@roeck-us.net>
65 -----------
72 Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
76 -----------
78 This driver does not auto-detect devices. You will have to instantiate the
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Dfam15h_power.rst16 - BIOS and Kernel Developer's Guide (BKDG) For AMD Family 15h Processors
17 - BIOS and Kernel Developer's Guide (BKDG) For AMD Family 16h Processors
18 - AMD64 Architecture Programmer's Manual Volume 2: System Programming
23 -----------
28 processor varies based on the workload being executed. Derated power
55 On multi-node processors the calculated value is for the entire
57 attributes only for internal node0 of a multi-node processor.
62 calculate the average power consumed by a processor during a
91 CPU average power
110 v. Calculate the average power consumption for a compute unit over
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Dacpi_power_meter.rst17 -----------
21 features--a power meter that returns average power use over a configurable
24 of Documentation/hwmon/sysfs-interface.rst.
27 ----------------
29 The `power[1-*]_is_battery` knob indicates if the power supply is a battery.
30 Both `power[1-*]_average_{min,max}` must be set before the trip points will work.
31 When both of them are set, an ACPI event will be broadcast on the ACPI netlink
33 `power[1-*]_average` sysfs file.
35 The `power[1-*]_{model_number, serial_number, oem_info}` fields display
40 the case, the `power[1-*]_cap` and related sysfs files will appear. When the
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Docc.rst1 Kernel driver occ-hwmon
12 -----------
14 This driver supports hardware monitoring for the On-Chip Controller (OCC)
15 embedded on POWER processors. The OCC is a device that collects and aggregates
17 sensor data as well as perform thermal and power management on the system.
20 manually if an "ibm,p8-occ-hwmon" compatible device is found under the
21 appropriate I2C bus node in the device-tree.
23 The P9 version of this driver is a client driver of the FSI-based OCC driver.
24 It will be probed automatically by the FSI-based OCC driver.
27 -------------
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Dsysfs-interface.rst5 through the sysfs interface. Since lm-sensors 3.0.0, libsensors is
6 completely chip-independent. It assumes that all the kernel drivers
10 This is a major improvement compared to lm-sensors 2.
14 temperature sensor is connected to the CPU, or that the second fan is on
22 For this reason, even if we aim at a chip-independent libsensors, it will
37 Up to lm-sensors 3.0.0, libsensors looks for hardware monitoring attributes
38 in the "physical" device directory. Since lm-sensors 3.0.1, attributes found
53 than once, even if there is a single element of the given type on the
61 to cause an alarm) is chip-dependent.
65 are interpreted as 0! For more on how written strings are interpreted see the
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Dibmaem.rst15 driver ("ipmi-si") needs to be loaded for this driver to do anything.
24 -----------
27 available on various IBM System X hardware through the BMC. All sensor banks
33 last BMC reset, and a power sensor that returns average power use over a
41 ----------------
Dmax34440.rst10 Addresses scanned: -
16 PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
20 Addresses scanned: -
26 PMBus Power-Supply Data Logger
30 Addresses scanned: -
36 PMBus 16-Channel V/I Monitor and 12-Channel Sequencer/Marginer
40 Addresses scanned: -
46 PMBus 12-Channel Voltage Monitor & Sequencer
50 Addresses scanned: -
56 PMBus 16-Channel Voltage Monitor & Sequencer
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/Documentation/devicetree/bindings/input/touchscreen/
Dimx6ul_tsc.txt4 - compatible: must be "fsl,imx6ul-tsc".
5 - reg: this touch controller address and the ADC2 address.
6 - interrupts: the interrupt of this touch controller and ADC2.
7 - clocks: the root clock of touch controller and ADC2.
8 - clock-names; must be "tsc" and "adc".
9 - xnur-gpio: the X- gpio this controller connect to.
10 This xnur-gpio returns to low once the finger leave the touch screen (The
14 - measure-delay-time: the value of measure delay time.
15 Before X-axis or Y-axis measurement, the screen need some time before
17 This value depends on the touch screen.
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Dti-tsc-adc.txt1 * TI - TSC ADC (Touschscreen and analog digital converter)
5 - mfd
7 "ti,am3359-tscadc" for AM335x/AM437x SoCs
8 "ti,am654-tscadc", "ti,am3359-tscadc" for AM654 SoCs
9 - child "tsc"
10 compatible: Should be "ti,am3359-tsc".
12 support on the platform.
13 ti,x-plate-resistance: X plate resistance
14 ti,coordinate-readouts: The sequencer supports a total of 16
23 ti,wire-config: Different boards could have a different order for
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Dtouchscreen.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Dmitry Torokhov <dmitry.torokhov@gmail.com>
13 touchscreen-min-x:
18 touchscreen-min-y:
23 touchscreen-size-x:
27 touchscreen-size-y:
31 touchscreen-max-pressure:
32 description: maximum reported pressure (arbitrary range dependent on the controller)
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/Documentation/userspace-api/media/drivers/
Dimx-uapi.rst1 .. SPDX-License-Identifier: GPL-2.0
13 ---------
18 - V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR
22 (see below for more on the FIM).
30 -----------------------------------
33 NTSC/PAL signal re-sync (too little or too many video lines). When
34 this happens, the IPU triggers a mechanism to re-establish vertical
52 the FIM event notification on the ipuX_csiY subdev device node.
60 - V4L2_CID_IMX_FIM_ENABLE
64 - V4L2_CID_IMX_FIM_NUM
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/Documentation/admin-guide/pm/
Dcpufreq_drivers.rst1 .. SPDX-License-Identifier: GPL-2.0
21 there is a different cpu-freq driver for each generation.
23 Note that the driver's will not load on the "wrong" hardware,
29 to load on processors without this capability. The capability
37 6th Generation: powernow-k6
39 7th Generation: powernow-k7: Athlon, Duron, Geode.
41 8th Generation: powernow-k8: Athlon, Athlon 64, Opteron, Sempron.
42 Documentation on this functionality in 8th generation processors
46 BIOS supplied data, for powernow-k7 and for powernow-k8, may be
49 The powernow-k8 driver will attempt to use ACPI if so configured,
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/Documentation/admin-guide/acpi/
Dcppc_sysfs.rst1 .. SPDX-License-Identifier: GPL-2.0
11 performance of a logical processor on a contigious and abstract performance
13 to request performance levels and to measure per-cpu delivered performance.
15 For more details on CPPC please refer to the ACPI specification at:
25 $ ls -lR /sys/devices/system/cpu/cpu0/acpi_cppc/
28 -r--r--r-- 1 root root 65536 Mar 5 19:38 feedback_ctrs
29 -r--r--r-- 1 root root 65536 Mar 5 19:38 highest_perf
30 -r--r--r-- 1 root root 65536 Mar 5 19:38 lowest_freq
31 -r--r--r-- 1 root root 65536 Mar 5 19:38 lowest_nonlinear_perf
32 -r--r--r-- 1 root root 65536 Mar 5 19:38 lowest_perf
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/Documentation/devicetree/bindings/leds/
Dleds-lm3532.txt1 * Texas Instruments - lm3532 White LED driver with ambient light sensing
4 The LM3532 provides the 3 high-voltage, low-side current sinks. The device is
5 programmable over an I2C-compatible interface and has independent
11 each with 32 internal voltage setting resistors, 8-bit logarithmic and linear
16 - compatible : "ti,lm3532"
17 - reg : I2C slave address
18 - #address-cells : 1
19 - #size-cells : 0
22 - enable-gpios : gpio pin to enable (active high)/disable the device.
23 - ramp-up-us - The Run time ramp rates/step are from one current
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/Documentation/ABI/testing/
Dsysfs-devices-platform-trackpoint4 Contact: linux-input@vger.kernel.org
11 Contact: linux-input@vger.kernel.org
19 Contact: linux-input@vger.kernel.org
21 (RW) Backup range for z-axis press.
26 Contact: linux-input@vger.kernel.org
29 z-axis pressed.
34 Contact: linux-input@vger.kernel.org
41 Contact: linux-input@vger.kernel.org
48 Contact: linux-input@vger.kernel.org
50 (RW) Minimum value for z-axis force required to trigger a press
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Dsysfs-class-bdi13 Device number for block devices, or value of st_dev on
14 non-block filesystems which provide their own BDI, such as NFS
17 MAJOR:MINOR-fuseblk
19 Value of st_dev on fuseblk filesystems.
23 The default backing dev, used for non-block device backed
28 read_ahead_kb (read-write)
30 Size of the read-ahead window in kilobytes
32 min_ratio (read-write)
35 total write-back cache that relates to its current average
39 percentage of the write-back cache to a particular device.
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Dsysfs-class-power5 Contact: linux-pm@vger.kernel.org
14 Contact: linux-pm@vger.kernel.org
23 Contact: linux-pm@vger.kernel.org
32 Contact: linux-pm@vger.kernel.org
43 Contact: linux-pm@vger.kernel.org
47 Reports an average IBAT current reading for the battery, over
49 in which they average readings to smooth out the reported
54 Reports an average IBUS current reading over a fixed period.
56 average readings to smooth out the reported value.
66 Contact: linux-pm@vger.kernel.org
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/Documentation/usb/
Ddwc3.rst11 - Convert interrupt handler to per-ep-thread-irq
13 As it turns out some DWC3-commands ~1ms to complete. Currently we spin
18 - dwc core implements a demultiplexing irq chip for interrupts per
20 to the device. If MSI provides per-endpoint interrupt this dummy
22 - interrupts are requested / allocated on usb_ep_enable() and removed on
25 - dwc3_send_gadget_ep_cmd() will sleep in wait_for_completion_timeout()
27 - the interrupt handler is split into the following pieces:
29 - primary handler of the device
31 it. On return from generic_handle_irq() in acknowledges the event
34 - threaded handler of the device
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/Documentation/admin-guide/
Dbcache.rst11 This is the git repository of bcache-tools:
12 https://git.kernel.org/pub/scm/linux/kernel/git/colyli/bcache-tools.git/
17 It's designed around the performance characteristics of SSDs - it only allocates
24 off, but can be switched on and off arbitrarily at runtime. Bcache goes to
25 great lengths to protect your data - it reliably handles unclean shutdown. (It
27 writes as completed until they're on stable storage).
29 Writeback caching can use most of the cache for buffering writes - writing
35 it also keeps a rolling average of the IO sizes per task, and as long as the
36 average is above the cutoff it will skip all IO from that task - instead of
40 In the event of a data IO error on the flash it will try to recover by reading
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/Documentation/devicetree/bindings/clock/
Dti,cdce925.txt6 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
15 - compatible: Shall be one of the following:
16 - "ti,cdce913": 1-PLL, 3 Outputs
17 - "ti,cdce925": 2-PLL, 5 Outputs
18 - "ti,cdce937": 3-PLL, 7 Outputs
19 - "ti,cdce949": 4-PLL, 9 Outputs
20 - reg: I2C device address.
21 - clocks: Points to a fixed parent clock that provides the input frequency.
22 - #clock-cells: From common clock bindings: Shall be 1.
25 - xtal-load-pf: Crystal load-capacitor value to fine-tune performance on a
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/Documentation/staging/
Dspeculation.rst8 ------------------------------------------------------------------------------
10 To improve performance and minimize average latencies, many contemporary CPUs
16 observe its impact on microarchitectural state, such as the presence or
17 absence of data in caches. Such state may form side-channels which can be
32 Which, on arm64, may be compiled to an assembly sequence such as::
42 It is possible that a CPU mis-predicts the conditional branch, and
49 code, building on the prior example::
62 of an out-of-bounds address, while the second call will influence
63 microarchitectural state dependent on this value. This may provide an
67 Mitigating speculation side-channels
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/Documentation/process/
Dmanagement-style.rst7 on who you ask) management style for the linux kernel. It's meant to
8 mirror the :ref:`process/coding-style.rst <codingstyle>` document to some
35 ------------
37 Everybody thinks managers make decisions, and that decision-making is
44 to decide on this", you're in trouble as a manager. The people you
55 painful ones. Making small and non-consequential decisions is fine, and
65 **two** inconsequential decisions - the wrong one **and** the right one.
72 you cannot escape. A cornered rat may be dangerous - a cornered manager
79 thing you can backtrack on is a technical decision, and there
80 back-tracking is very easy: just tell everybody that you were an
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