Hmmm, I have found a way to do multi-register reads and writes in device-driver:

```rust
let (a, b, c, d) = device
        .multi_from_range(|d| (d.reg_a(), d.reg_d()))
        .read()
        .unwrap();
```

Downside is that I'd have to let the codegen output a lot of trait impls, one for all possible chains.
`ab, bc, cd, abc, bcd, abcd`

That might be way too much if you have like 200 registers... right? That'd be 19900 combinations in my calculations.
Or do we think otherwise?