vscphy_write
vscphy_write(vsc, VSC8501_EXTPAGE_REG, VSC8501_RGMII_CTRL_PAGE);
vscphy_write(vsc, VSC8501_RGMII_CTRL_REG, reg);
vscphy_write(vsc, VSC8501_EXTPAGE_REG, 0);
vscphy_write(vsc, VSC8501_EXTCTL1_REG, reg);
vscphy_write(vsc, VSC8501_INT_MASK, value);