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/Documentation/devicetree/bindings/pps/
Dpps-gpio.txt1 Device-Tree Bindings for a PPS Signal on GPIO
3 These properties describe a PPS (pulse-per-second) signal connected to
7 - compatible: should be "pps-gpio"
8 - gpios: one PPS GPIO in the format described by ../gpio/gpio.txt
10 Additional required properties for the PPS ECHO functionality:
11 - echo-gpios: one PPS ECHO GPIO in the format described by ../gpio/gpio.txt
12 - echo-active-ms: duration in ms of the active portion of the echo pulse
15 - assert-falling-edge: when present, assert is indicated by a falling edge
20 pinctrl-names = "default";
21 pinctrl-0 = <&pinctrl_pps>;
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/Documentation/devicetree/bindings/iio/proximity/
Ddevantech-srf04.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/iio/proximity/devantech-srf04.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andreas Klinger <ak@it-klinger.de>
13 Bit-banging driver using two GPIOs:
14 - trigger-gpio is raised by the driver to start sending out an ultrasonic
16 - echo-gpio is held high by the sensor after sending ultrasonic burst
20 http://www.robot-electronics.co.uk/htm/srf04tech.htm
22 http://www.maxbotix.com/documents/LV-MaxSonar-EZ_Datasheet.pdf
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/Documentation/misc-devices/
Dc2port.txt2 ---------------
19 --------
22 C2 Interface used for in-system programming of micro controllers.
24 By using this driver you can reprogram the in-system flash without EC2
26 where the micro controller is connected via special GPIOs pins.
29 ----------
34 - AN127: FLASH Programming via the C2 Interface at
37 - C2 Specification at
41 banging) designed to enable in-system programming, debugging, and
42 boundary-scan testing on low pin-count Silicon Labs devices. Currently
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/Documentation/admin-guide/gpio/
Dsysfs.rst7 Documentation/ABI/obsolete/sysfs-gpio AND NEW USERSPACE CONSUMERS
16 ------------------------
18 configure a sysfs user interface to GPIOs. This is different from the
27 then changing its output state, then updating the code before re-enabling
37 PLEASE READ THE DOCUMENT AT Documentation/driver-api/gpio/drivers-on-gpio.rst
41 --------------
44 - Control interfaces used to get userspace control over GPIOs;
46 - GPIOs themselves; and
48 - GPIO controllers ("gpio_chip" instances).
52 The control interfaces are write-only:
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/Documentation/driver-api/
Dpps.rst1 .. SPDX-License-Identifier: GPL-2.0
4 PPS - Pulse Per Second
22 --------
32 Carrier Detect pin) or to a parallel port (ACK-pin) or to a special
33 CPU's GPIOs (this is the common case in embedded systems) but in each
38 GPS receiver as PPS source, to obtain a wallclock-time with
39 sub-millisecond synchronisation to UTC.
43 ------------------
46 CPU GPIO-Pin as physical link to the signal, I encountered a deeper
56 purpose GPIO line. In this case even basic file-related functionality
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/Documentation/driver-api/gpio/
Dlegacy.rst13 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
18 which GPIOs. Drivers can be written generically, so that board setup code
21 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
22 non-dedicated pin can be configured as a GPIO; and most chips have at least
24 provide GPIOs; multifunction chips like power managers, and audio codecs
27 Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
30 The exact capabilities of GPIOs vary between systems. Common options:
32 - Output values are writable (high=1, low=0). Some chips also have
34 value might be driven ... supporting "wire-OR" and similar schemes
37 - Input values are likewise readable (1, 0). Some chips support readback
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/Documentation/hwmon/
Dltc4245.rst10 Addresses scanned: 0x20-0x3f
20 -----------
28 -----------
38 $ echo ltc4245 0x23 > /sys/bus/i2c/devices/i2c-1/new_device
42 -------------
44 The LTC4245 has built-in limits for over and under current warnings. This
48 into the values specified in the sysfs-interface document. The current readings
55 in4_input Vee (-12v) input voltage (mV)
60 in4_min_alarm Vee (-12v) input undervoltage alarm
65 curr4_input Vee (-12v) current (mA)
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/Documentation/translations/zh_CN/
Dgpio.txt1 Chinese translated version of Documentation/admin-guide/gpio
12 ---------------------------------------------------------------------
13 Documentation/admin-guide/gpio 的中文翻译
26 ---------------------------------------------------------------------
53 - 输出值可写 (高电平=1，低电平=0)。一些芯片也有如何驱动这些值的选项,
57 - 输入值可读(1、0)。一些芯片支持引脚在配置为“输出”时回读，这对于类似
61 - 输入通常可作为 IRQ 信号,一般是沿触发,但有时是电平触发。这样的 IRQ
64 - 通常一个 GPIO 根据不同产品电路板的需求,可以配置为输入或输出,也有仅
67 - 大部分 GPIO 可以在持有自旋锁时访问,但是通常由串行总线扩展的 GPIO
101 ---------
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