determine the value for the digital up converter. Finally, we feed
any residual_freq to the s/w freq translater.
"""
- r = self.u.tune(self.subdev._which, self.subdev, target_freq)
+ r = self.u.tune(self.subdev.which(), self.subdev, target_freq)
if r:
# Use residual_freq in s/w freq translator
return True