PRUSS_MII_RT_TX_IPG0
regmap_write(mii_rt, PRUSS_MII_RT_TX_IPG0, ipg);
regmap_read(mii_rt, PRUSS_MII_RT_TX_IPG0, &val);
regmap_write(mii_rt, PRUSS_MII_RT_TX_IPG0, val);