i2s_gpio_offset
u_int i2s_gpio_offset(struct i2s_softc *, char *, int *);
sc->sc_spkr = i2s_gpio_offset(sc, "platform-amp-mute", NULL);
sc->sc_hp = i2s_gpio_offset(sc, "platform-headphone-mute", NULL);
sc->sc_hp_detect = i2s_gpio_offset(sc, "platform-headphone-detect",
sc->sc_line = i2s_gpio_offset(sc, "platform-lineout-mute", NULL);
sc->sc_line_detect = i2s_gpio_offset(sc, "platform-lineout-detect",
sc->sc_hw_reset = i2s_gpio_offset(sc, "platform-hw-reset", NULL);