You can access the official MIPI SPMI v2.0 specification through the MIPI Alliance website. Note that while summaries are public, full PDF access often requires MIPI membership. Key Features of MIPI SPMI
The protocol uses a command-based structure. It allows for single-byte or multi-byte transfers, which minimizes the overhead for simple "on/off" commands while allowing complex register configurations when needed. 4. Power Saving Modes mipi spmi specification pdf