GPIO 子系统框架 func call /** * struct gpio_chip - abstract a GPIO controller * @label: a functional name for the GPIO device, such as a part * number or the name of the SoC IP-block implementing it. * @gpiodev: the internal state holder, opaque struct * @parent: optional parent device providing the GPIOs * @owner: helps prevent removal of modules exporting active GPIOs * @request: optional……
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