Linux 内核设备驱动之GPIO驱动之GPIO GPIO描述符到GPIO CHIP

/**  * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs  * @desc: descriptor to return the chip of  */ struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) {  if (!desc || !desc->gdev || !desc->gdev->chip)   return NULL;  return desc->gdev->chip; } EXPORT_SYMBOL_GPL(gpiod_to_chip);