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4 Note that standard kernel drivers exist for common GPIO tasks and will provide
5 the right in-kernel and userspace APIs/ABIs for the job, and that these
14   (and that LED may in turn use the leds-gpio as per above).
24   up to three buttons by simply using GPIOs and no mouse port. You can cut the
25   mouse cable and connect the wires to GPIO lines or solder a mouse connector
41   system by pulling a GPIO line and will register a restart handler so
45   by pulling a GPIO line and will register a pm_power_off() callback so that
49   (off/on) that uses a GPIO, and integrated with the clock subsystem.
52   (two wires, SDA and SCL lines) by hammering (bitbang) two GPIO lines. It will
53   appear as any other I2C bus to the system and makes it possible to connect
57   of wires, atleast SCK and optionally MISO, MOSI and chip select lines) using
59   and makes it possible to connect drivers for SPI devices on the bus like
64   a GPIO line, integrating with the W1 subsystem and handling devices on
68   system, connected to a GPIO line (and optionally a GPIO alarm line),
69   presenting all the right in-kernel and sysfs interfaces to make your system
74   with the regulator subsystem and giving you all the right interfaces.
83   NAND flash MTD subsystem and provides chip access and partition parsing like
87 read card detect and write protect GPIO lines, and in the TTY serial subsystem
94 just using the apropriate kernel drivers will simplify and speed up your