The padding of additional bits will be done to the MSB (4 bits). We cant modify it for sending the padded bits to LSB (4 bits). You can try packing the pixels instead.
Please refer to this KBA Streaming RAW10 Format Input Data to 16/24-bit Output Format in CX3 MIPI CSI-2 - KBA224387 which mentions about padding and packing of RAW 10 to 16 bits. Similarly, you can modifications to the firmware for RAW12.
Please let me know if any queries on this
Thanks for your reply. Any way can modify byte order to Little Endian?
Any way can modify byte order to Little Endian?
>> We cannot change the padding of additional bits to LSB (4 bits)