MUX_I2C12
.mux_id = MUX_I2C12,
[MUX_I2C12] = &(struct multi_mux){ &i2c1_k.hw, &i2c2_k.hw },
CFG_MUX(MUX_I2C12, RCC_I2C12CKSELR, 0, 3),