ENC28J60_READ_CTRL_REG
return spi_read_op(priv, ENC28J60_READ_CTRL_REG, address);
rl = spi_read_op(priv, ENC28J60_READ_CTRL_REG, address);
rh = spi_read_op(priv, ENC28J60_READ_CTRL_REG, address + 1);