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Application space GPIO support. Linux GPIO support includes the ability to export GPIO control and status for use with applications using sysfs. No other driver can be using the GPIO of interest. Simple tools like cat and echo can be used to quickly read the current value of a GPIO input or to set the level of a GPIO output. Configure the ...
https://www.kernel.org/doc/html/latest/driver-api/gpio/index.html
GPIO IRQ chip implementation, provided by GPIO driver. domain Interrupt translation domain; responsible for mapping between GPIO hwirq number and Linux IRQ number. domain_ops Table of interrupt domain operations for this IRQ chip. fwnode Firmware node corresponding to this gpiochip/irqchip, necessary for hierarchical irqdomain support. parent ...
https://community.nxp.com/docs/DOC-332743
Sep 20, 2016 · This document introduces how to configure RCW to support GPIO on LS1043 platform, how to configure Linux Kernel to load Linux GPIO driver to access GPIO from SYSFS and using loopback method to do verification on the target board.Reviews: 1
https://www.kernel.org/doc/html/v4.17/driver-api/gpio/board.html
In the future, these flags might be extended to support more properties. Note that GPIO_LOOKUP() is just a shortcut to GPIO_LOOKUP_IDX() where idx = 0. A lookup table can then be defined as follows, with an empty entry defining its end. The ‘dev_id’ field of the table is the identifier of the device that will make use of these GPIOs.
https://www.emcraft.com/stm32f429discovery/controlling-gpio-from-linux-user-space
This application note explains how to drive GPIO outputs and read the state of GPIO inputs from the Linux user-space on the STM32F429. The API that is used to control GPIO is the standard Linux GPIOLIB interface. The API is described in the Linux documenation available in the kernel tree from the following file: linux/Documentation/gpio.txt.
https://www.kernel.org/doc/html/latest/driver-api/gpio/legacy.html
This provides an overview of GPIO access conventions on Linux. ... , else it is up to the user to configure support for GPIO. It may also provide a custom value for ARCH_NR_GPIOS, so that it better reflects the number of GPIOs in actual use on that platform, without wasting static table space. (It should count both built-in/SoC GPIOs and also ...
https://www.kernel.org/doc/html/latest/admin-guide/gpio/sysfs.html
Note that this attribute will not exist if the kernel doesn’t support changing the direction of a GPIO, or it was exported by kernel code that didn’t explicitly allow userspace to reconfigure this GPIO’s direction. “value” … reads as either 0 (low) or 1 (high).
https://github.com/zephyrproject-rtos/zephyr/pull/16648
This is a first PR in series which updates GPIO API, drivers and samples to implement changes discussed in #15611, #10339. It is based on work done in #12651, #11880. The primary focus of this PR is to introduce standard flags used by Linux DT bindings. The specific changes implemented: Added GPIO_ACTIVE_LOW, GPIO_ACTIVE_HIGH to indicate pin active state.
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