fdtbus_pwm_acquire
pwm_tag_t fdtbus_pwm_acquire(int, const char *);
sc->sc_pwm = fdtbus_pwm_acquire(phandle, "pwms");
sc->sc_pwm = fdtbus_pwm_acquire(phandle, "pwms");
sc->sc_pwm = fdtbus_pwm_acquire(sc->sc_phandle, "pwms");