Re: [PATCH v11 4/4] rust: platform: allow ioremap of platform resources

[Danilo Krummrich <dakr@kernel.org>]

On 7/1/25 4:34 PM, Daniel Almeida wrote:
> +impl Device<device::Bound> {

<snip>

> +    pub fn iomap_resource_sized<const SIZE: usize>(
> +        &self,
> +        resource: &Resource,
> +    ) -> Result<impl PinInit<Devres<IoMem<SIZE>>, Error> + '_> {
> +        IoMem::new(resource, self.as_ref())
> +    }

Sorry that I did not catch this earlier, but what if I supply a Resource here
that has *not* been obtained by any of the platform::Device methods and from the
same platform::Device as you call this function for?

I think this also needs something similar to what we do in the IRQ abstraction,
e.g.:

	/// # Invariants
	///
	/// `res` has been obtained from `dev`.
	pub struct IoRequest<'a> {
	   dev: &'a Device<Bound>,
	   res: &'a Resource,
	}

Such that IoMem::new() can take an IoRequest instance instead.