NAU8821_FLL_CLK_SW_SFT
#define NAU8821_FLL_CLK_SW_MASK (0x1 << NAU8821_FLL_CLK_SW_SFT)
#define NAU8821_FLL_CLK_SW_N2 (0x1 << NAU8821_FLL_CLK_SW_SFT)
#define NAU8821_FLL_CLK_SW_REF (0x0 << NAU8821_FLL_CLK_SW_SFT)