gpio_pin_get_by_child_index
int gpio_pin_get_by_child_index(device_t _child, uint32_t _idx, gpio_pin_t *_gp);
if ((err = gpio_pin_get_by_child_index(sc->dev, sclnum,
if ((err = gpio_pin_get_by_child_index(sc->dev, sdanum,
err = gpio_pin_get_by_child_index(dev, PIN_IDX, &sc->pin);
err = gpio_pin_get_by_child_index(dev, OW_PIN, &sc->sc_pin);