LAN9252_ECAT_CSR_CMD
ret = lan9252_spi_read(spi, LAN9252_ECAT_CSR_CMD, &data);
ret = lan9252_spi_read(spi, LAN9252_ECAT_CSR_CMD, &data);
ret = lan9252_spi_write(spi, LAN9252_ECAT_CSR_CMD, csr_cmd);
ret = lan9252_spi_write(spi, LAN9252_ECAT_CSR_CMD, csr_cmd);