MAC_MII_DATA
rb[ETH_MII_DATA] = lan743x_csr_read(adapter, MAC_MII_DATA);
val = lan743x_csr_read(adapter, MAC_MII_DATA);
lan743x_csr_write(adapter, MAC_MII_DATA, val);
lan743x_csr_write(adapter, MAC_MII_DATA, index);
ret = lan743x_csr_read(adapter, MAC_MII_DATA);
lan743x_csr_write(adapter, MAC_MII_DATA, (u32)index);
lan743x_csr_write(adapter, MAC_MII_DATA, (u32)regval);
mac->mii.data = MAC_MII_DATA;