SI5351_PLL_INPUT_SOURCE
si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, mask,
val = si5351_reg_read(hwdata->drvdata, SI5351_PLL_INPUT_SOURCE);