linux-kernel - Re: [PATCH RFC v2 1/1] rust: Add bindings for device properties

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Message-ID: <CAL_JsqJ-cFq4jyFDnCWKy1b+7pNt8Tb11QF8vGoMb2G_4=dpBw@mail.gmail.com>
Date: Mon, 25 Nov 2024 09:35:15 -0600
From: Rob Herring <robh@...nel.org>
To: Dirk Behme <dirk.behme@...bosch.com>
Cc: Saravana Kannan <saravanak@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J . Wysocki" <rafael@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH RFC v2 1/1] rust: Add bindings for device properties

On Fri, Nov 22, 2024 at 2:13 AM Dirk Behme <dirk.behme@...bosch.com> wrote:
>
> From: "Rob Herring (Arm)" <robh@...nel.org>
>
> The device property API is a firmware agnostic API for reading
> properties from firmware (DT/ACPI) devices nodes and swnodes.
>
> While the C API takes a pointer to a caller allocated variable/buffer,
> the rust API is designed to return a value and can be used in struct
> initialization. Rust generics are also utilized to support different
> sizes of properties (e.g. u8, u16, u32).
>
> To build and run the Examples as `rustdoc` tests the kernel Kconfig
> options `CONFIG_OF` and `CONFIG_OF_UNITTEST` need to be enabled
> additionally. Besides the default `rustdoc` test options
> `CONFIG_KUNIT` and `CONFIG_RUST_KERNEL_DOCTESTS`. This even works
> on non-ARM architectures as a test device tree is built into the
> kernel, then.
>
> The Integer trait is proposed by Alic Ryhl [1].
>
> Link: https://lore.kernel.org/rust-for-linux/CAH5fLgiXPZqKpWSSNdx-Ww-E9h2tOLcF3_8Y4C_JQ0eU8EMwFw@mail.gmail.com/ [1]
> Co-developed-by: Dirk Behme <dirk.behme@...bosch.com>
> Signed-off-by: Dirk Behme <dirk.behme@...bosch.com>
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> ---
>
> This is an update of Rob's initial patch

I have my own updates on it based on the discussion. It's a bit
different because I've reworked the C API to better mesh with Rust
needs. I just haven't sent it out because I've been busy with other
things and it's the merge window.

You asked me if I was going to work on this and I did. If you want to
do it, just say so. I'm always happy for less work.

Rob