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/linux-5.10/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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/linux-5.10/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 https://www.robot-electronics.co.uk/htm/srf04tech.htm
22 https://www.maxbotix.com/documents/LV-MaxSonar-EZ_Datasheet.pdf
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Dparallax-ping.yaml1 # SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/iio/proximity/parallax-ping.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andreas Klinger <ak@it-klinger.de>
13 Bit-banging driver using one GPIO:
14 - ping-gpios is raised by the driver to start measurement
15 - direction of ping-gpio is then switched into input with an interrupt
19 http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
20 http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
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/linux-5.10/Documentation/admin-guide/gpio/
Dgpio-aggregator.rst1 .. SPDX-License-Identifier: GPL-2.0-only
6 The GPIO Aggregator provides a mechanism to aggregate GPIOs, and expose them as
10 Aggregating GPIOs using Sysfs
11 -----------------------------
15 system permissions, on an all-or-nothing basis: either a GPIO controller is
18 The GPIO Aggregator provides access control for a set of one or more GPIOs, by
21 simplifies and hardens exporting GPIOs to a virtual machine, as the VM can just
22 grab the full GPIO controller, and no longer needs to care about which GPIOs to
26 write-only attribute files in sysfs.
28 /sys/bus/platform/drivers/gpio-aggregator/
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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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/linux-5.10/drivers/iio/proximity/
Dsrf04.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * SRF04: ultrasonic sensor for distance measuring by using GPIOs
5 * Copyright (c) 2017 Andreas Klinger <ak@it-klinger.de>
8 * https://www.robot-electronics.co.uk/htm/srf04tech.htm
12 * +---+
14 * trig: --+ +------------------------------------------------------
16 * |<->|
19 * ultra +-+ +-+ +-+
21 * burst: ---------+ +-+ +-+ +-----------------------------------------
23 * ultra . +-+ +-+ +-+
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Dping.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * PING: ultrasonic sensor for distance measuring by using only one GPIOs
5 * Copyright (c) 2019 Andreas Klinger <ak@it-klinger.de>
8 * http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
9 * http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
16 * |<->| interrupt interrupt
18 * |<---------------------->|
20 * . --> one round trip of ultra sonic waves
27 * echo: __________________________________/ \_/ \_/ \________________
81 if (gpiod_get_value(data->gpiod_ping)) { in ping_handle_irq()
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DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
47 module will be called pulsedlight-lite-v2
66 with just one GPIO for the trigger and echo. This driver can be
70 - Parallax PING))) (ultrasonic)
71 - Parallax LaserPING (time-of-flight)
80 Say Y to build a driver for the RFD77402 Time-of-Flight (distance)
92 of objects. It is using two GPIOs.
94 - Devantech SRF04
95 - Maxbotix mb1000
96 - Maxbotix mb1010
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/linux-5.10/Documentation/misc-devices/
Dc2port.rst1 .. SPDX-License-Identifier: GPL-2.0
23 --------
26 C2 Interface used for in-system programming of micro controllers.
28 By using this driver you can reprogram the in-system flash without EC2
30 where the micro controller is connected via special GPIOs pins.
33 ----------
38 - AN127: FLASH Programming via the C2 Interface at
41 - C2 Specification at
45 banging) designed to enable in-system programming, debugging, and
46 boundary-scan testing on low pin-count Silicon Labs devices. Currently
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/linux-5.10/drivers/pps/clients/
Dpps-gpio.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * pps-gpio.c -- PPS client driver using GPIO
9 #define PPS_GPIO_NAME "pps-gpio"
19 #include <linux/pps-gpio.h>
34 struct timer_list echo_timer; /* timer to reset echo active state */
37 unsigned int echo_active_ms; /* PPS echo active duration */
56 rising_edge = gpiod_get_value(info->gpio_pin); in pps_gpio_irq_handler()
57 if ((rising_edge && !info->assert_falling_edge) || in pps_gpio_irq_handler()
58 (!rising_edge && info->assert_falling_edge)) in pps_gpio_irq_handler()
59 pps_event(info->pps, &ts, PPS_CAPTUREASSERT, data); in pps_gpio_irq_handler()
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/linux-5.10/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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/linux-5.10/arch/arm/boot/dts/
Domap3-echo.dts1 // SPDX-License-Identifier: GPL-2.0-only
5 /dts-v1/;
9 #include <dt-bindings/input/input.h>
12 model = "Amazon Echo (first generation)";
13 compatible = "amazon,omap3-echo", "ti,omap3630", "ti,omap3";
17 cpu0-supply = <&vdd1_reg>;
27 compatible = "regulator-fixed";
28 regulator-name = "vcc5v";
29 regulator-min-microvolt = <5000000>;
30 regulator-max-microvolt = <5000000>;
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/linux-5.10/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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/linux-5.10/arch/powerpc/platforms/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
35 bool "ePAPR para-virtualization support"
37 Enables ePAPR para-virtualization support for guests.
46 a hypervisor. This option is not user-selectable but should
62 bool "Device-tree based CPU feature discovery & setup"
107 e.g. "echo 5 > /sys/devices/system/mpic/timer_wakeup"
121 registers are used for inter-processor communication.
203 bool "On-chip CPU temperature sensor support"
206 G3 and G4 processors have an on-chip temperature sensor called the
207 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
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/linux-5.10/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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/linux-5.10/drivers/fsi/
Dfsi-master-ast-cf.c1 // SPDX-License-Identifier: GPL-2.0+
4 * A FSI master controller, using a simple GPIO bit-banging interface
25 #include "fsi-master.h"
26 #include "cf-fsi-fw.h"
28 #define FW_FILE_NAME "cf-fsi-fw.bin"
132 msg->msg <<= bits; in msg_push_bits()
133 msg->msg |= data & ((1ull << bits) - 1); in msg_push_bits()
134 msg->bits += bits; in msg_push_bits()
142 top = msg->bits & 0x3; in msg_push_crc()
144 /* start bit, and any non-aligned top bits */ in msg_push_crc()
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/linux-5.10/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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/linux-5.10/drivers/spi/
Dspi-lantiq-ssc.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011-2015 Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
4 * Copyright (C) 2016 Hauke Mehrtens <hauke@hauke-m.de>
70 #define LTQ_SPI_CON_EM BIT(24) /* Echo mode */
141 #define LTQ_SPI_RXCNT_TODO_M 0xFFFF /* Recevie to-do value */
190 return __raw_readl(spi->regbase + reg); in lantiq_ssc_readl()
196 __raw_writel(val, spi->regbase + reg); in lantiq_ssc_writel()
202 u32 val = __raw_readl(spi->regbase + reg); in lantiq_ssc_maskl()
206 __raw_writel(val, spi->regbase + reg); in lantiq_ssc_maskl()
211 const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; in tx_fifo_level()
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/linux-5.10/drivers/net/ethernet/freescale/
Dfec_main.c1 // SPDX-License-Identifier: GPL-2.0+
17 * Copyright (c) 2001-2005 Greg Ungerer (gerg@snapgear.com)
20 * Copyright (c) 2004-2006 Macq Electronique SA.
22 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
140 .name = "imx25-fec",
143 .name = "imx27-fec",
146 .name = "imx28-fec",
149 .name = "imx6q-fec",
152 .name = "mvf600-fec",
155 .name = "imx6sx-fec",
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/linux-5.10/drivers/isdn/hardware/mISDN/
Dhfcmulti.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * hfcmulti.c low level driver for hfc-4s/hfc-8s/hfc-e1 based cards
7 * Peter Sprenger (sprengermoving-bytes.de)
9 * inspired by existing hfc-pci driver:
10 * Copyright 1999 by Werner Cornelius (werner@isdn-development.de)
22 * Bit 0-7 = 0x00001 = HFC-E1 (1 port)
23 * or Bit 0-7 = 0x00004 = HFC-4S (4 ports)
24 * or Bit 0-7 = 0x00008 = HFC-8S (8 ports)
26 * Bit 9 = 0x00200 = Disable DTMF detect on all B-channels via hardware
38 * example: 0x20204 one HFC-4S with dtmf detection and 128 timeslots on PCM
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