MVPP2_GMAC_CTRL_1_REG
val = readl(port->base + MVPP2_GMAC_CTRL_1_REG) &
writel(val, port->base + MVPP2_GMAC_CTRL_1_REG);
val = readl(port->base + MVPP2_GMAC_CTRL_1_REG);
writel(val, port->base + MVPP2_GMAC_CTRL_1_REG);
mac_addr_l = readl(port->base + MVPP2_GMAC_CTRL_1_REG);