lan743x_sgmii_read
val = lan743x_sgmii_read(adp, regs[idx].dev, regs[idx].addr);
mpllctrl0 = lan743x_sgmii_read(adapter, MDIO_MMD_VEND2,
mii_ctrl = lan743x_sgmii_read(adapter, MDIO_MMD_VEND2, MII_BMCR);
an_ctrl = lan743x_sgmii_read(adapter, MDIO_MMD_VEND2, VR_MII_AN_CTRL);
dgt_ctrl = lan743x_sgmii_read(adapter, MDIO_MMD_VEND2,
dig_sts = lan743x_sgmii_read(adapter, MDIO_MMD_VEND2,
mii_ctl = lan743x_sgmii_read(adapter, MDIO_MMD_VEND2, MII_BMCR);
int lan743x_sgmii_read(struct lan743x_adapter *adapter, u8 mmd, u16 addr);