| /linux/Documentation/driver-api/gpio/ |
| H A D | consumer.rst | 8 Guidelines for GPIOs consumers
13 obtain and use GPIOs are available by including the following file::
21 - Simple compile coverage with e.g. COMPILE_TEST - it does not matter that
25 - Truly optional GPIOLIB support - where the driver does not really make use
26 of the GPIOs on certain compile-time configurations for certain systems, but
27 will use it under other compile-time configurations. In this case the
35 All the functions that work with the descriptor-based GPIO interface are
42 Obtaining and Disposing GPIOs
45 With the descriptor-based interface, GPIOs are identified with an opaque,
46 non-forgeable handler that must be obtained through a call to one of the
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| H A D | board.rst | 5 This document explains how GPIOs can be assigned to given devices and functions.
9 Kconfig. Then, how GPIOs are mapped depends on what the platform uses to
14 -----------
15 GPIOs can easily be mapped to devices and functions in the device tree. The
16 exact way to do it depends on the GPIO controller providing the GPIOs, see the
19 GPIOs mappings are defined in the consumer device's node, in a property named
20 <function>-gpios, where <function> is the function the driver will request
26 led-gpios = <&gpio 15 GPIO_ACTIVE_HIGH>, /* red */
30 power-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
33 Properties named <function>-gpio are also considered valid and old bindings use
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| /linux/arch/arm/boot/dts/renesas/ |
| H A D | r8a7793-gose.dts | 1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2014-2015 Renesas Electronics Corporation
9 * SSI-AK4643
17 * amixer set "LINEOUT Mixer DACL" on
18 * amixer set "DVC Out" 100%
19 * amixer set "DVC In" 100%
23 * amixer set "DVC Out Mute" on
24 * amixer set "DVC In Mute" on
28 * amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
29 * amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
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| H A D | r8a7791-koelsch.dts | 1 // SPDX-License-Identifier: GPL-2.0
6 * Copyright (C) 2013-2014 Renesas Solutions Corp.
11 * SSI-AK4643
19 * amixer set "LINEOUT Mixer DACL" on
20 * amixer set "DVC Out" 100%
21 * amixer set "DVC In" 100%
25 * amixer set "DVC Out Mute" on
26 * amixer set "DVC In Mute" on
30 * amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
31 * amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
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| H A D | r8a7790-lager.dts | 1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2013-2014 Renesas Solutions Corp.
7 * Copyright (C) 2015-2016 Renesas Electronics Corporation
11 * SSI-AK4643
19 * amixer set "LINEOUT Mixer DACL" on
20 * amixer set "DVC Out" 100%
21 * amixer set "DVC In" 100%
25 * amixer set "DVC Out Mute" on
26 * amixer set "DVC In Mute" on
30 * amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
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| /linux/Documentation/devicetree/bindings/i2c/ |
| H A D | i2c-mux-gpio.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-mux-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO-based I2C Bus Mux
10 - Wolfram Sang <wsa@kernel.org>
13 This binding describes an I2C bus multiplexer that uses GPIOs to route the I2C signals.
15 +-----+ +-----+
17 +------------+ +-----+ +-----+
19 | | /--------+--------+
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| /linux/Documentation/devicetree/bindings/iio/proximity/ |
| H A D | devantech-srf04.yaml | 1 # 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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| /linux/Documentation/devicetree/bindings/gpio/ |
| H A D | gpio.txt | 4 1) gpios property
5 -----------------
7 GPIO properties should be named "[<name>-]gpios", with <name> being the purpose
8 of this GPIO for the device. While a non-existent <name> is considered valid
9 for compatibility reasons (resolving to the "gpios" property), it is not allowed
10 for new bindings. Also, GPIO properties named "[<name>-]gpio" are valid and old
15 cases should they contain more than one. If your device uses several GPIOs with
17 meaningful name. The only case where an array of GPIOs is accepted is when
18 several GPIOs serve the same function (e.g. a parallel data line).
20 The exact purpose of each gpios property must be documented in the device tree
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| /linux/include/linux/gpio/ |
| H A D | driver.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
12 #include <linux/pinctrl/pinconf-generic.h>
49 * struct gpio_irq_chip - GPIO interrupt controller
79 * If non-NULL, will be set as the parent of this GPIO interrupt
91 * hardware IRQs correspond to the GPIO index 0..ngpio-1 (see the
99 * HWIRQ, return -EINVAL, but also make sure to fill in @valid_mask and
114 * &gpiochip_populate_parent_fwspec_twocell will be used. A four-cell
229 * True if set the interrupt handling uses nested threads.
271 * bits from 0..(ngpios-1) set to "1" as in valid. The callback can
272 * then directly set some bits to "0" if they cannot be used for
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| /linux/sound/soc/ |
| H A D | soc-jack.c | 1 // SPDX-License-Identifier: GPL-2.0+
3 // soc-jack.c -- ALSA SoC jack handling
20 * snd_soc_jack_report - Report the current status for a jack
39 if (!jack || !jack->jack) in snd_soc_jack_report()
43 dapm = &jack->card->dapm; in snd_soc_jack_report()
45 mutex_lock(&jack->mutex); in snd_soc_jack_report()
47 jack->status &= ~mask; in snd_soc_jack_report()
48 jack->status |= status & mask; in snd_soc_jack_report()
52 list_for_each_entry(pin, &jack->pins, list) { in snd_soc_jack_report()
53 int enable = pin->mask & jack->status; in snd_soc_jack_report()
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| /linux/Documentation/devicetree/bindings/iio/frequency/ |
| H A D | adi,adf4377.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Antoniu Miclaus <antoniu.miclaus@analog.com>
11 - Dragos Bogdan <dragos.bogdan@analog.com>
14 The ADF4377 is a high performance, ultralow jitter, dual output integer-N
25 - adi,adf4377
26 - adi,adf4378
31 spi-max-frequency:
37 clock-names:
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| /linux/Documentation/admin-guide/gpio/ |
| H A D | gpio-aggregator.rst | 1 .. 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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| /linux/Documentation/devicetree/bindings/serial/ |
| H A D | st,stm32-uart.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/serial/st,stm32-uart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 - Erwan Le Ray <erwan.leray@foss.st.com>
15 - st,stm32-uart
16 - st,stm32f7-uart
17 - st,stm32h7-uart
34 st,hw-flow-ctrl:
38 rx-tx-swap: true
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| H A D | 8250.yaml | 3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - devicetree@vger.kernel.org
13 - $ref: serial.yaml#
14 - $ref: /schemas/memory-controllers/mc-peripheral-props.yaml#
15 - if:
17 - required:
18 - aspeed,lpc-io-reg
19 - required:
20 - aspeed,lpc-interrupts
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| /linux/Documentation/devicetree/bindings/power/reset/ |
| H A D | gpio-restart.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/reset/gpio-restart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sebastian Reichel <sre@kernel.org>
17 'open-source' is not found, the GPIO line will be driven in the inactive state. Otherwise its
22 This will also cause an inactive->active edge condition, triggering positive edge triggered
23 reset. After a delay specified by active-delay, the GPIO is set to inactive, thus causing an
24 active->inactive edge, triggering negative edge triggered reset. After a delay specified by
25 inactive-delay, the GPIO is driven active again. After a delay specified by wait-delay, the
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| /linux/arch/arm64/boot/dts/renesas/ |
| H A D | r8a779h0-gray-hawk-single.dts | 1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 * Device Tree Source for the R-Car V4M Gray Hawk Single board
11 * Because R-Car V4M has only 1 SSI, it cannot handle both Playback/Capture
16 * > amixer set "MUX" "Playback" // for GP0_01
17 * > amixer set "DAC 1" 85%
21 * > amixer set "MUX" "Capture" // for GP0_01
22 * > amixer set "Mic 1" 80%
23 * > amixer set "ADC 1" on
24 * > amixer set 'ADC 1' 80%
28 /dts-v1/;
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| H A D | salvator-common.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
3 * Device Tree Source for common parts of Salvator-X board variants
5 * Copyright (C) 2015-2016 Renesas Electronics Corp.
9 * SSI-AK4613
13 * amixer set "DVC Out" 100%
14 * amixer set "DVC In" 100%
18 * amixer set "DVC Out Mute" on
19 * amixer set "DVC In Mute" on
23 * amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
24 * amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
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| /linux/drivers/gpio/ |
| H A D | gpio-davinci.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (c) 2006-2007 David Brownell
43 #define BINTEN 0x8 /* GPIO Interrupt Per-Bank Enable Register */
73 /*--------------------------------------------------------------------------*/
86 g = d->regs[bank]; in __davinci_direction()
87 spin_lock_irqsave(&d->lock, flags); in __davinci_direction()
88 temp = readl_relaxed(&g->dir); in __davinci_direction()
91 writel_relaxed(mask, value ? &g->set_data : &g->clr_data); in __davinci_direction()
95 writel_relaxed(temp, &g->dir); in __davinci_direction()
96 spin_unlock_irqrestore(&d->lock, flags); in __davinci_direction()
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| /linux/arch/arm64/boot/dts/mediatek/ |
| H A D | mt7986a-bananapi-bpi-r3.dts | 1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
5 * Frank Wunderlich <frank-w@public-files.de>
9 /dts-v1/;
10 #include <dt-bindings/gpio/gpio.h>
11 #include <dt-bindings/input/input.h>
12 #include <dt-bindings/leds/common.h>
13 #include <dt-bindings/pinctrl/mt65xx.h>
18 model = "Bananapi BPI-R3";
19 chassis-type = "embedded";
20 compatible = "bananapi,bpi-r3", "mediatek,mt7986a";
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| /linux/arch/arm64/boot/dts/qcom/ |
| H A D | sm8550-hdk.dts | 1 // SPDX-License-Identifier: BSD-3-Clause
6 /dts-v1/;
8 #include <dt-bindings/leds/common.h>
9 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
22 compatible = "qcom,sm8550-hdk", "qcom,sm8550";
23 chassis-type = "embedded";
30 wcd938x: audio-codec {
31 compatible = "qcom,wcd9385-codec";
33 pinctrl-names = "default";
34 pinctrl-0 = <&wcd_default>;
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| /linux/Documentation/devicetree/bindings/leds/ |
| H A D | richtek,rt8515.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
22 enf-gpios:
26 ent-gpios:
30 richtek,rfs-ohms:
34 resistors limits the maximum flash current. This must be set
35 for the property flash-max-microamp to work, the RFS resistor
39 richtek,rts-ohms:
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| /linux/Documentation/devicetree/bindings/sound/ |
| H A D | st,sta32x.txt | 7 - compatible: "st,sta32x"
8 - reg: the I2C address of the device for I2C
9 - reset-gpios: a GPIO spec for the reset pin. If specified, it will be
12 - power-down-gpios: a GPIO spec for the power down pin. If specified,
16 - Vdda-supply: regulator spec, providing 3.3V
17 - Vdd3-supply: regulator spec, providing 3.3V
18 - Vcc-supply: regulator spec, providing 5V - 26V
22 - clocks, clock-names: Clock specifier for XTI input clock.
24 and disabled when it is removed. The 'clock-names' must be set to 'xti'.
26 - st,output-conf: number, Selects the output configuration:
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| /linux/arch/arm/boot/dts/broadcom/ |
| H A D | bcm4709-buffalo-wxr-1900dhp.dts | 1 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
4 * DTS for Buffalo WXR-1900DHP
9 /dts-v1/;
12 #include "bcm5301x-nand-cs0-bch8.dtsi"
15 compatible = "buffalo,wxr-1900dhp", "brcm,bcm4709", "brcm,bcm4708";
16 model = "Buffalo WXR-1900DHP";
29 compatible = "gpio-leds";
31 led-usb {
33 gpios = <&chipcommon 4 GPIO_ACTIVE_HIGH>;
36 led-power-amber {
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| /linux/Documentation/devicetree/bindings/mfd/ |
| H A D | max77620.txt | 4 -------------------
5 - compatible: Must be one of
9 - reg: I2C device address.
12 -------------------
13 - interrupts: The interrupt on the parent the controller is
15 - interrupt-controller: Marks the device node as an interrupt controller.
16 - #interrupt-cells: is <2> and their usage is compliant to the 2 cells
17 variant of <../interrupt-controller/interrupts.txt>
19 are defined at dt-bindings/mfd/max77620.h.
21 - system-power-controller: Indicates that this PMIC is controlling the
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| /linux/Documentation/devicetree/bindings/display/panel/ |
| H A D | panel-mipi-dbi-spi.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/display/panel/panel-mipi-dbi-spi.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Noralf Trønnes <noralf@tronnes.org>
23 - Power:
24 - Vdd: Power supply for display module
25 Called power-supply in this binding.
26 - Vddi: Logic level supply for interface signals
27 Called io-supply in this binding.
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