From bed01ca9e9cf8f8fea5352c07fa206cc3c106045 Mon Sep 17 00:00:00 2001
From: Gary Guo <gary@garyguo.net>
Date: Mon, 6 Jul 2026 13:44:24 +0100
Subject: rust: io: remove `MmioOwned`

`Io` trait is now very easy to implement. Thus, implement it on `Bar` and
`IoMem` directly and remove the `MmioOwned` struct.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Suggested-by: Danilo Krummrich <dakr@kernel.org>
Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Generic.20I.2FO.20backends/near/571198078
Link: https://patch.msgid.link/20260706-io_projection-v6-11-72cd5d055d54@garyguo.net
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 rust/kernel/devres.rs | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

(limited to 'rust/kernel/devres.rs')

diff --git a/rust/kernel/devres.rs b/rust/kernel/devres.rs
index aed0c994fd30..3545ffc5345d 100644
--- a/rust/kernel/devres.rs
+++ b/rust/kernel/devres.rs
@@ -68,8 +68,9 @@ struct Inner<T> {
 ///     devres::Devres,
 ///     io::{
 ///         Io,
-///         MmioOwned,
+///         Mmio,
 ///         MmioRaw,
+///         MmioBackend,
 ///         PhysAddr,
 ///         Region, //
 ///     },
@@ -104,12 +105,13 @@ struct Inner<T> {
 ///     }
 /// }
 ///
-/// impl<const SIZE: usize> Deref for IoMem<SIZE> {
-///    type Target = MmioOwned<SIZE>;
+/// impl<'a, const SIZE: usize> Io<'a> for &'a IoMem<SIZE> {
+///    type Backend = MmioBackend;
+///    type Target = Region<SIZE>;
 ///
-///    fn deref(&self) -> &Self::Target {
+///    fn as_view(self) -> Mmio<'a, Region<SIZE>> {
 ///         // SAFETY: The memory range stored in `self` has been properly mapped in `Self::new`.
-///         unsafe { MmioOwned::from_raw(&self.0) }
+///         unsafe { Mmio::from_raw(self.0) }
 ///    }
 /// }
 /// # fn no_run(dev: &Device<Bound>) -> Result<(), Error> {
-- 
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