RCC_LPTIM23CKSELR
K_MMUX(M_LPTIM23, RCC_LPTIM23CKSELR, 0, 3, 0),
CFG_MUX(MUX_LPTIM2, RCC_LPTIM23CKSELR, 0, 3),
CFG_MUX(MUX_LPTIM3, RCC_LPTIM23CKSELR, 3, 3),