Re: [PATCH v9 2/5] rust: io: factor common I/O helpers into Io trait

["Danilo Krummrich" <dakr@kernel.org>]

(Cc: Markus)

On Fri Jan 16, 2026 at 4:23 PM CET, Gary Guo wrote:
> I wonder if we can keep all methods on `Io` trait. And then have marker trait to
> represent capability on performing Io access.
>
> Something like:
>
> trait IoCapable<T> {}
>
> trait Io {
>      fn read8(&self, offset: usize) -> u8 where Self: IoCapable<u8>;
>      fn read16(&self, offset: usize) -> u16 where Self: IoCapable<u16>;
>      fn read32(&self, offset: usize) -> u32 where Self: IoCapable<u32>;
>      fn read64(&self, offset: usize) -> u64 where Self: IoCapable<u64>;
> }
>
> Then you have a single (non-marker) trait and not a hierachy of them.

I think that is a great idea. I think it will also help with supporting I/O
backends based on regmap.