I have looked at the following two websites for searching Raspberry Pi.

https://www.raspberrypi.com/
https://orangepi.com/

Our requirement is to have 100 Mbit/s Ethernet RJ45, I2C, SPI and some GPIOs.

I have found Raspberry Pi Model B+ and Orange Pi Zero. They do have 100 Mbit/s Ethernet RJ45 but I am not sure if they also have I2C and SPI.

Is there exist Raspberry Pi with 100 Mbit/s Ethernet RJ45, I2C, SPI and some GPIOs ?

A general question on Raspberry Pi, do we have access to the schematic of the development boards of Raspberry Pi that can be used as a reference design to add/implement Micro Processor with peripherals in the custom design hardware ?

 

Full circuit diagrams of Raspberry Pi boards are not available. You will get partial diagrams.

 

That's true. Only the top level in which pinout of connectors and interfaces are given on one page is usually available.

I have tried to find the full schematic but it is not very easy to find the full schematic of the development boards of Raspberry Pi.