Interfacing with MIPI camera sensors
So, you will need "something" that can drive/configure your sensor as well as read data from it and send it to the SD/PC. My solution was to use a EZUSB FX3 usb microcontroller. I was able to create a quick interface between the image sensor and the FX3, and then, I did not have to worry about creating a usb communication between the FX3 and the PC or SD because it includes SPI and USB interfaces' logic. So, your custom board will only have the three major components: the sensor, the FX3 and PROM for storing configuration data of FX3. The rest will be just simple resistors caps and power components. You will have to adjust the software part - as most of it is already written by the company as an example.

Bottom line is, you want to use some system on a chip, like the one above or similar, to have a relatively easy and fast solution.