mv88e6xxx_port_hidden_read
return mv88e6xxx_port_hidden_read(chip, 0, 0xf, 0x7, &dummy);
err = mv88e6xxx_port_hidden_read(chip, 0xf, port, 0, &val);
err = mv88e6xxx_port_hidden_read(chip, 0x7, addr, 0, ®);
int mv88e6xxx_port_hidden_read(struct mv88e6xxx_chip *chip, int block, int port,