RK_GRF_MACPHY_CON0
regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_CFG_CLK_50M);
regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_GMAC2PHY_RMII_MODE);
regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_ENABLE);
regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);