linux-kernel - Re: [PATCH 4/5] rust: i2c: add I2C wrappers

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Message-Id: <DG6C8WCFHEDC.1XPP6ST35HRG9@kernel.org>
Date: Wed, 04 Feb 2026 18:03:15 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Igor Korotin" <igor.korotin@...ux.dev>
Cc: "Markus Probst" <markus.probst@...teo.de>,
 <igor.korotin.linux@...il.com>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "Miguel Ojeda" <ojeda@...nel.org>, "Boqun
 Feng" <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, "Benno Lossin"
 <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice
 Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>, "Wolfram
 Sang" <wsa+renesas@...g-engineering.com>, <linux-kernel@...r.kernel.org>,
 <rust-for-linux@...r.kernel.org>, <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH 4/5] rust: i2c: add I2C wrappers

On Wed Feb 4, 2026 at 5:49 PM CET, Igor Korotin wrote:
> `Bound` can be safely dereferenced to `Normal`. Since `Normal` represents
> the minimal required typestate for device operations, any API that works
> with `Normal` automatically works with `Bound` or `Core` as well. Requiring
> `Bound` would unnecessarily restrict the API and force duplication or 
> unsafe casts.

We cannot allow drivers to retain access to device resources of unbound devices.
To prevent that we never give out a pci::Bar or IoMem instance without a Devres
container.