Device driver for embedded board

I have to write a linux device driver for a customized embedded board. The board contains flash, I2C controller, LEDs, discretes etc. All devices are memory mapped.
I have 2 alternatives:

1. The device driver will map (by implementing mmap) all memory IO space. This way the user space driver can access all peripherals.

2. Each device will have its own device driver and a user space driver. So I will create few *.ko files (not one as in the first alternative).

What is the optimal way ?

Thanks,
Zvika Vered.

Since you have totally different devices, I don't see much sense to map them in flat memory, and do everything at user level. I'd would have written device driver for each peripheral, and provided functions for user level to access these drivers. That would be more in spirit of true Linux, and potentially might save you few unexpected headaches. Having said that, I realize that each design is different, and might have specific requirements that don't fit in canonical model, use you own experience and utter perception of beauty while creating your design.