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Date: Mon, 21 Jul 2025 14:13:14 +0200
Message-Id: <DBHQ2ZDUHLSW.LHWUTFQO1E60@kernel.org>
Subject: Re: [PATCH 2/3] device: rust: expand documentation for Device
Cc: "Greg KH" <gregkh@linuxfoundation.org>, <rafael@kernel.org>,
 <ojeda@kernel.org>, <alex.gaynor@gmail.com>, <boqun.feng@gmail.com>,
 <gary@garyguo.net>, <bjorn3_gh@protonmail.com>, <lossin@kernel.org>,
 <a.hindborg@kernel.org>, <tmgross@umich.edu>,
 <rust-for-linux@vger.kernel.org>, <linux-kernel@vger.kernel.org>
To: "Alice Ryhl" <aliceryhl@google.com>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20250717224806.54763-1-dakr@kernel.org>
 <20250717224806.54763-3-dakr@kernel.org> <aH4juIVmj8euE1CA@google.com>
 <2025072125-twine-curling-db0b@gregkh> <aH4telYyyexiMbjx@google.com>
In-Reply-To: <aH4telYyyexiMbjx@google.com>

On Mon Jul 21, 2025 at 2:07 PM CEST, Alice Ryhl wrote:
> The connection is that to request an irq you must have a &Device<Bound>,
> so if you can only obtain a &Device<Bound> to a bus device, then that
> means that you can never request an irq for a class device.

As mentioned in my other reply, a class device never owns resources of a "r=
eal"
device such as an IRQ.

A USB device, which represents a real device on a bus, is a bus device, in =
your
example the class device is the input device.