| /openbmc/linux/Documentation/devicetree/bindings/i2c/ |
| H A D | i2c-gpio.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO bitbanged I2C
10 - Wolfram Sang <wsa@kernel.org>
13 - $ref: /schemas/i2c/i2c-controller.yaml#
18 - const: i2c-gpio
20 sda-gpios:
22 gpio used for the sda signal, this should be flagged as
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| /openbmc/linux/arch/arm64/boot/dts/nvidia/ |
| H A D | tegra210-p2597.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
3 #include <dt-bindings/gpio/tegra-gpio.h>
4 #include <dt-bindings/input/input.h>
5 #include <dt-bindings/pinctrl/pinctrl-tegra.h>
23 avdd-dsi-csi-supply = <&vdd_dsi_csi>;
33 avdd-io-hdmi-dp-supply = <&avdd_1v05>;
34 vdd-hdmi-dp-pll-supply = <&vdd_1v8>;
35 hdmi-supply = <&vdd_hdmi>;
37 nvidia,ddc-i2c-bus = <&hdmi_ddc>;
38 nvidia,hpd-gpio = <&gpio TEGRA_GPIO(CC, 1)
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| H A D | tegra210-p2894.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
3 #include <dt-bindings/input/input.h>
4 #include <dt-bindings/input/gpio-keys.h>
5 #include <dt-bindings/mfd/max77620.h>
6 #include <dt-bindings/pinctrl/pinctrl-tegra.h>
16 stdout-path = "serial0:115200n8";
26 pinctrl-names = "boot";
27 pinctrl-0 = <&state_boot>;
35 nvidia,enable-input = <TEGRA_PIN_DISABLE>;
36 nvidia,open-drain = <TEGRA_PIN_DISABLE>;
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| H A D | tegra210-smaug.dts | 1 // SPDX-License-Identifier: GPL-2.0
2 /dts-v1/;
4 #include <dt-bindings/input/input.h>
5 #include <dt-bindings/mfd/max77620.h>
6 #include <dt-bindings/pinctrl/pinctrl-tegra.h>
12 compatible = "google,smaug-rev8", "google,smaug-rev7",
13 "google,smaug-rev6", "google,smaug-rev5",
14 "google,smaug-rev4", "google,smaug-rev3",
15 "google,smaug-rev2", "google,smaug-rev1",
25 stdout-path = "serial0:115200n8";
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| /openbmc/linux/Documentation/driver-api/gpio/ |
| H A D | intro.rst | 6 GPIO Interfaces
13 Due to the history of GPIO interfaces in the kernel, there are two different
16 - The descriptor-based interface is the preferred way to manipulate GPIOs,
18 - The legacy integer-based interface which is considered deprecated (but still
21 The remainder of this document applies to the new descriptor-based interface.
23 integer-based interface.
26 What is a GPIO?
29 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
31 to Linux developers working with embedded and custom hardware. Each GPIO
37 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
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| H A D | consumer.rst | 2 GPIO Descriptor Consumer Interface
5 This document describes the consumer interface of the GPIO framework. Note that
6 it describes the new descriptor-based interface. For a description of the
7 deprecated integer-based GPIO interface please refer to legacy.rst.
13 Drivers that can't work without standard GPIO calls should have Kconfig entries
17 #include <linux/gpio/consumer.h>
23 - Simple compile coverage with e.g. COMPILE_TEST - it does not matter that
27 - Truly optional GPIOLIB support - where the driver does not really make use
28 of the GPIOs on certain compile-time configurations for certain systems, but
29 will use it under other compile-time configurations. In this case the
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| H A D | driver.rst | 2 GPIO Driver Interface
5 This document serves as a guide for writers of GPIO chip drivers.
7 Each GPIO controller driver needs to include the following header, which defines
8 the structures used to define a GPIO driver::
10 #include <linux/gpio/driver.h>
16 A GPIO chip handles one or more GPIO lines. To be considered a GPIO chip, the
18 line is not general purpose, it is not GPIO and should not be handled by a
19 GPIO chip. The use case is the indicative: certain lines in a system may be
20 called GPIO but serve a very particular purpose thus not meeting the criteria
22 GPIO and should therefore still be handled by a GPIO chip driver.
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| /openbmc/linux/Documentation/devicetree/bindings/serio/ |
| H A D | ps2-gpio.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/serio/ps2-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO based PS/2
10 - Danilo Krummrich <danilokrummrich@dk-develop.de>
14 const: ps2-gpio
16 data-gpios:
18 the gpio used for the data signal - this should be flagged as
19 active high using open drain with (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)
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| /openbmc/linux/drivers/w1/masters/ |
| H A D | w1-gpio.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * w1-gpio - GPIO w1 bus master driver
12 #include <linux/w1-gpio.h>
13 #include <linux/gpio/consumer.h>
26 pdata->pullup_duration = delay; in w1_gpio_set_pullup()
28 if (pdata->pullup_duration) { in w1_gpio_set_pullup()
30 * This will OVERRIDE open drain emulation and force-pull in w1_gpio_set_pullup()
33 gpiod_set_raw_value(pdata->gpiod, 1); in w1_gpio_set_pullup()
34 msleep(pdata->pullup_duration); in w1_gpio_set_pullup()
37 * open drain emulation in the GPIO library. in w1_gpio_set_pullup()
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| /openbmc/u-boot/include/dt-bindings/gpio/ |
| H A D | gpio.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
3 * This header provides constants for most GPIO bindings.
5 * Most GPIO bindings include a flags cell as part of the GPIO specifier.
17 /* Bit 1 express single-endedness */
21 /* Bit 2 express Open drain or open source */
26 * Open Drain/Collector is the combination of single-ended open drain interface.
27 * Open Source/Emitter is the combination of single-ended open source interface.
32 /* Bit 3 express GPIO suspend/resume and reset persistence */
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| /openbmc/linux/include/dt-bindings/gpio/ |
| H A D | gpio.h | 1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
3 * This header provides constants for most GPIO bindings.
5 * Most GPIO bindings include a flags cell as part of the GPIO specifier.
17 /* Bit 1 express single-endedness */
21 /* Bit 2 express Open drain or open source */
26 * Open Drain/Collector is the combination of single-ended open drain interface.
27 * Open Source/Emitter is the combination of single-ended open source interface.
32 /* Bit 3 express GPIO suspend/resume and reset persistence */
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| /openbmc/linux/include/linux/platform_data/ |
| H A D | i2c-gpio.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * i2c-gpio interface to platform code
11 * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
15 * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
21 * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up.
22 * Therefore disable open-drain.
23 * @scl_is_open_drain: SCL is set up as open drain. Same requirements
26 * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up.
27 * Therefore disable open-drain.
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| /openbmc/u-boot/arch/sandbox/include/asm/ |
| H A D | gpio.h | 1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * This is the interface to the sandbox GPIO driver for test code which
4 * wants to change the GPIO values reported to U-Boot.
13 * We use the generic interface, and add a back-channel.
15 * The back-channel functions are declared in this file. They should not be used
19 * a simulated GPIO. From then on, normal code in U-Boot will see this new
24 #include <asm-generic/gpio.h>
27 * Return the simulated value of a GPIO (used only in sandbox test code)
30 * @param offset GPIO offset within bank
31 * @return -1 on error, 0 if GPIO is low, >0 if high
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| /openbmc/linux/drivers/gpio/ |
| H A D | gpio-tps65218.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
7 * This driver is based on the gpio-tps65912 implementation.
13 #include <linux/gpio/driver.h>
26 struct tps65218 *tps65218 = tps65218_gpio->tps65218; in tps65218_gpio_get()
30 ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val); in tps65218_gpio_get()
41 struct tps65218 *tps65218 = tps65218_gpio->tps65218; in tps65218_gpio_set()
64 return -EPERM; in tps65218_gpio_input()
70 struct tps65218 *tps65218 = tps65218_gpio->tps65218; in tps65218_gpio_request()
74 dev_err(gc->parent, "can't work as open source\n"); in tps65218_gpio_request()
75 return -EINVAL; in tps65218_gpio_request()
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| H A D | gpio-vx855.c | 1 // SPDX-License-Identifier: GPL-2.0+
3 * Linux GPIOlib driver for the VIA VX855 integrated southbridge GPIO
12 #include <linux/gpio/driver.h>
21 /* The VX855 south bridge has the following GPIO pins:
24 * GPIO 0...14 General Purpose I/O (Open-Drain)
35 struct gpio_chip gpio; member
74 /* Mapping between numeric GPIO ID and the actual GPIO hardware numbering:
77 * 27..41 GPIO 0..14
80 static int vx855gpio_direction_input(struct gpio_chip *gpio, in vx855gpio_direction_input() argument
83 struct vx855_gpio *vg = gpiochip_get_data(gpio); in vx855gpio_direction_input()
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| /openbmc/linux/Documentation/devicetree/bindings/w1/ |
| H A D | w1-gpio.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/w1/w1-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Bitbanged GPIO 1-Wire Bus
10 - Daniel Mack <zonque@gmail.com>
14 const: w1-gpio
19 - description: Data I/O pin
20 - description: Enable pin for an external pull-up resistor
22 linux,open-drain:
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| /openbmc/linux/Documentation/devicetree/bindings/regulator/ |
| H A D | fixed-regulator.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/regulator/fixed-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Liam Girdwood <lgirdwood@gmail.com>
11 - Mark Brown <broonie@kernel.org>
16 expected to have the regulator-min-microvolt and regulator-max-microvolt
20 - $ref: regulator.yaml#
21 - if:
25 const: regulator-fixed-clock
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| H A D | gpio-regulator.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/regulator/gpio-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO controlled regulators
10 - Liam Girdwood <lgirdwood@gmail.com>
11 - Mark Brown <broonie@kernel.org>
18 - $ref: regulator.yaml#
22 const: regulator-gpio
24 regulator-name: true
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| /openbmc/linux/drivers/i2c/busses/ |
| H A D | i2c-gpio.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Bitbanging I2C bus driver using the GPIO API
10 #include <linux/gpio/consumer.h>
11 #include <linux/i2c-algo-bit.h>
16 #include <linux/platform_data/i2c-gpio.h>
37 * valid for pins configured as open drain (i.e. setting the value
44 gpiod_set_value_cansleep(priv->sda, state); in i2c_gpio_setsda_val()
49 * for pins that are configured as open drain and for output-only
57 gpiod_set_value_cansleep(priv->scl, state); in i2c_gpio_setscl_val()
64 return gpiod_get_value_cansleep(priv->sda); in i2c_gpio_getsda()
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| /openbmc/linux/arch/arm/boot/dts/st/ |
| H A D | ste-href-tvk1281618-r2.dtsi | 1 // SPDX-License-Identifier: GPL-2.0-or-later
6 #include <dt-bindings/interrupt-controller/irq.h>
7 #include <dt-bindings/input/input.h>
11 compatible = "gpio-keys";
12 #address-cells = <1>;
13 #size-cells = <0>;
14 vdd-supply = <&ab8500_ldo_aux1_reg>;
15 pinctrl-names = "default";
16 pinctrl-0 = <&prox_tvk_mode>, <&hall_tvk_mode>;
37 interrupt-parent = <&gpio6>;
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| /openbmc/u-boot/arch/arm/dts/ |
| H A D | stm32mp157-pinctrl.dtsi | 1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
3 * Copyright (C) STMicroelectronics 2017 - All Rights Reserved
6 #include <dt-bindings/pinctrl/stm32-pinfunc.h>
10 pinctrl: pin-controller@50002000 {
11 #address-cells = <1>;
12 #size-cells = <1>;
13 compatible = "st,stm32mp157-pinctrl";
15 interrupt-parent = <&exti>;
17 pins-are-numbered;
19 gpioa: gpio@50002000 {
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| /openbmc/linux/include/dt-bindings/sound/ |
| H A D | cs35l45.h | 1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
3 * cs35l45.h -- CS35L45 ALSA SoC audio driver DT bindings header
12 * cirrus,asp-sdout-hiz-ctrl
14 * TX_HIZ_UNUSED: TX pin high-impedance during unused slots.
15 * TX_HIZ_DISABLED: TX pin high-impedance when all channels disabled.
21 * Optional GPIOX Sub-nodes:
22 * The cs35l45 node can have up to three "cirrus,gpio-ctrlX" ('X' = [1,2,3])
23 * sub-nodes for configuring the GPIO pins.
25 * - gpio-dir : GPIO pin direction. Valid only when 'gpio-ctrl'
30 * - gpio-lvl : GPIO level. Valid only when 'gpio-ctrl' is 1 and 'gpio-dir' is 0.
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| /openbmc/qemu/tests/qtest/ |
| H A D | stm32l4x5_gpio-test.c | 4 * Copyright (c) 2024 Arnaud Minier <arnaud.minier@telecom-paris.fr>
5 * Copyright (c) 2024 Inès Varhol <ines.varhol@telecom-paris.fr>
8 * See the COPYING file in the top-level directory.
12 #include "libqtest-single.h"
84 #define GPIO_ADDR_MASK (~(GPIO_SIZE - 1))
94 static uint32_t gpio_readl(unsigned int gpio, unsigned int offset) in gpio_readl() argument
96 return readl(gpio + offset); in gpio_readl()
99 static void gpio_writel(unsigned int gpio, unsigned int offset, uint32_t value) in gpio_writel() argument
101 writel(gpio + offset, value); in gpio_writel()
104 static void gpio_set_bit(unsigned int gpio, unsigned int reg, in gpio_set_bit() argument
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| /openbmc/linux/arch/arm/boot/dts/nvidia/ |
| H A D | tegra30-cardhu-a02.dts | 1 // SPDX-License-Identifier: GPL-2.0
2 /dts-v1/;
4 #include "tegra30-cardhu.dtsi"
10 compatible = "nvidia,cardhu-a02", "nvidia,cardhu", "nvidia,tegra30";
14 power-gpios = <&gpio TEGRA_GPIO(D, 4) GPIO_ACTIVE_HIGH>;
15 bus-width = <4>;
16 keep-power-in-suspend;
19 ddr_reg: regulator-ddr {
20 compatible = "regulator-fixed";
21 regulator-name = "vdd_ddr";
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| /openbmc/linux/Documentation/devicetree/bindings/pinctrl/ |
| H A D | lantiq,pinctrl-xway.txt | 4 - compatible: "lantiq,<chip>-pinctrl", where <chip> is:
10 - reg: Should contain the physical address and length of the gpio/pinmux
13 Please refer to pinctrl-bindings.txt in this directory for details of the
21 pull-up and open-drain
36 Required subnode-properties:
37 - lantiq,groups : An array of strings. Each string contains the name of a group.
39 - lantiq,function: A string containing the name of the function to mux to the
106 Required subnode-properties:
107 - lantiq,pins : An array of strings. Each string contains the name of a pin.
110 Optional subnode-properties:
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