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Date: Wed, 04 Feb 2026 18:03:15 +0100
Message-Id: <DG6C8WCFHEDC.1XPP6ST35HRG9@kernel.org>
Subject: Re: [PATCH 4/5] rust: i2c: add I2C wrappers
Cc: "Markus Probst" <markus.probst@posteo.de>,
 <igor.korotin.linux@gmail.com>, "Daniel Almeida"
 <daniel.almeida@collabora.com>, "Miguel Ojeda" <ojeda@kernel.org>, "Boqun
 Feng" <boqun.feng@gmail.com>, "Gary Guo" <gary@garyguo.net>,
 =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, "Benno Lossin"
 <lossin@kernel.org>, "Andreas Hindborg" <a.hindborg@kernel.org>, "Alice
 Ryhl" <aliceryhl@google.com>, "Trevor Gross" <tmgross@umich.edu>, "Wolfram
 Sang" <wsa+renesas@sang-engineering.com>, <linux-kernel@vger.kernel.org>,
 <rust-for-linux@vger.kernel.org>, <linux-i2c@vger.kernel.org>
To: "Igor Korotin" <igor.korotin@linux.dev>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260131-i2c-adapter-v1-0-5a436e34cd1a@gmail.com>
 <20260131-i2c-adapter-v1-4-5a436e34cd1a@gmail.com>
 <4b6d9f389862aa4d2c43394cdacde059c4cbba5e.camel@posteo.de>
 <93559442-38a9-4b6b-9cbb-7bb500ab1738@linux.dev>
In-Reply-To: <93559442-38a9-4b6b-9cbb-7bb500ab1738@linux.dev>

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. Requiri=
ng
> `Bound` would unnecessarily restrict the API and force duplication or=20
> unsafe casts.

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