SJA1000_ID2
priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
| (priv->read_reg(priv, SJA1000_ID2) << 13)
| (priv->read_reg(priv, SJA1000_ID2) >> 5);