MTL_OP_MODE_RTC_MASK
#define MTL_OP_MODE_RTC_32 FIELD_PREP(MTL_OP_MODE_RTC_MASK, 1)
#define MTL_OP_MODE_RTC_64 FIELD_PREP(MTL_OP_MODE_RTC_MASK, 0)
#define MTL_OP_MODE_RTC_96 FIELD_PREP(MTL_OP_MODE_RTC_MASK, 2)
#define MTL_OP_MODE_RTC_128 FIELD_PREP(MTL_OP_MODE_RTC_MASK, 3)
mtl_rx_op &= ~MTL_OP_MODE_RTC_MASK;